Securities and Exchange Commission, Washington, D.C. 20549

Annual Report on Form 10-K for the year ended December 31, 1999.
Filed pursuant to Section 13 of the Securities Exchange Act of 1934.
                 Commission file number 1-1463

                   UNION CARBIDE CORPORATION

                           1999 10-K


Union Carbide Corporation            Tel. (203) 794-2000
39 Old Ridgebury Road                State of incorporation: New York
Danbury, Connecticut 06817-0001      IRS identification number: 13-1421730



Securities registered pursuant to Section 12(b) of the Act:

Title of each class                   Name of each exchange on which registered


Common Stock ($1 par value)           New York Stock Exchange
                                      Chicago Stock Exchange, Incorporated
                                      The Pacific Stock Exchange Incorporated


Securities registered pursuant to Section 12(g) of the Act:
                             NONE

Indicate  by check mark whether the registrant (1)  has  filed
all reports required to be filed by Section 13 or 15(d) of the
Securities Exchange Act of 1934 during the preceding 12 months
(or  for  such shorter period that the registrant was required
to file such reports), and (2) has been subject to such filing
requirements for the past 90 days. Yes X No

Indicate  by  check  mark if disclosure of  delinquent  filers
pursuant  to  Item  405  of Regulation S-K  is  not  contained
herein, and will not be contained, to the best of registrant's
knowledge,  in  definitive  proxy  or  information  statements
incorporated by reference in Part III of this Form 10-K or any
amendment to this Form 10-K.

At  February 29, 2000, 134,442,379 shares of common stock were
outstanding. Non-affiliates held 133,763,120 of those  shares.
The  aggregate  market value of the non-affiliate  shares  was
$7.052 billion.

Documents incorporated by reference:

Annual report to stockholders for the year ended December  31,
1999 (Parts I and II)

Proxy  statement for the annual meeting of stockholders to  be
held on April 26, 2000 (Part III)



                       Table of Contents

Part I
Item 1:       Business                                                  1
Item 2:       Properties                                                3
Item 3:       Legal Proceedings                                         6
Item 4:       Submission of Matters to a Vote of Security Holders       7

Part II
Item 5:       Market for Registrant's Common Equity and Related
                Stockholder Matters                                     8
Item 6:       Selected Financial Data                                   8
Item 7:       Management's Discussion and Analysis of Financial
                Condition and Results of Operations                     8
Item 7a:      Quantitative and Qualitative Disclosures About Market
                Risk                                                    8
Item 8:       Financial Statements and Supplementary Data               8
Item 9:       Changes in and Disagreements with Accountants on
                Accounting and Financial Disclosure                     8

Part III
Item 10:      Directors and Executive Officers of the Registrant        9
Item 11:      Executive Compensation                                   10
Item 12:      Security Ownership of Certain Beneficial Owners and
                Management                                             10
Item 13:      Certain Relationships and Related Transactions           10

Part IV
Item 14:      Exhibits, Financial Statement Schedules and Reports
                on Form 8-K                                            11
Signatures                                                             14
Exhibit Index                                                          15

Cautionary statement: All statements in this Annual Report on
Form 10-K that do not reflect historical information are
forward-looking statements, within the meaning of the Private
Securities Litigation Reform Act of 1995 (as amended). Forward-
looking statements include statements concerning the pending
merger with The Dow Chemical Company (and, with regard to the
merger, the "Dow Merger"); plans; objectives; strategies;
anticipated future events or performance; sales; cost, expense
and earnings expectations; the Year 2000 issue; interest rate
and currency risk management; the chemical markets in 2000 and
beyond; development, production and acceptance of new products
and process technologies; ongoing and planned capacity
additions and expansions; joint ventures; Management's
Discussion & Analysis; and any other statements that do not
reflect historical information, including statements
incorporated herein by reference to the 1999 annual report to
stockholders. Such forward-looking statements are subject to
risks and uncertainties. Important factors that could cause
actual results to differ materially from those discussed in
such forward-looking statements include the supply/demand
balance for the corporation's products; customer inventory
levels; competitive pricing pressures; raw material
availability and costs; changes in industry production
capacities and operating rates; currency exchange rates;
interest rates; global economic conditions; competitive
technology positions; failure by the corporation to achieve
technology objectives, achieve cost reduction targets or
complete projects on schedule and on budget; inability to
obtain new customers or retain existing ones; and, with
respect to the Dow Merger, failure to obtain necessary
regulatory and other governmental approvals and failure to
satisfy conditions of the merger agreement. Some of these
factors are discussed further in Part I, Item 1: Business.

Definition of Terms: See page 48 of the 1999 annual report to
stockholders. Terms defined there are used herein.

(Recycled symbol) Printed on Recycled, Recyclable Paper


                            Part I


Item 1. Business

General-Union Carbide operates in two business segments of the
chemicals and plastics industry, Specialties & Intermediates
and Basic Chemicals & Polymers. Specialties & Intermediates
converts basic and intermediate chemicals into a diverse
portfolio of chemicals and polymers serving industrial
customers in many markets. This segment also provides
technology services, including licensing, to the oil and
petrochemicals industries. The Basic Chemicals & Polymers
segment converts hydrocarbon feedstocks, principally liquefied
petroleum gas and naphtha, into ethylene or propylene used to
manufacture polyethylene, polypropylene, ethylene oxide and
ethylene glycol for sale to third-party customers, as well as
ethylene, propylene, ethylene oxide and ethylene glycol for
consumption by the Specialties & Intermediates segment. The
profitability of the Basic Chemicals & Polymers segment of the
chemicals and plastics industry is highly cyclical, whereas
that of the Specialties & Intermediates segment is less
cyclical. Consequently, Union Carbide's results are subject to
the swings of the business cycle in both the highly volatile
Basic Chemicals & Polymers segment and the less volatile
Specialties & Intermediates segment. In addition to its
business segments, the corporation's Other segment includes
its noncore operations and financial transactions other than
derivatives designated as hedges, which are included in the
same segment as the item being hedged. See pages 1, 4, 5, and
"Results of Operations" on pages 7 through 14 of the 1999
annual report to stockholders for further information about
Union Carbide's businesses, and Note 6 on pages 30 and 31 of
the 1999 annual report to stockholders for financial
information about Union Carbide's business segments.

On August 3, 1999, the corporation and The Dow Chemical
Company (Dow) entered into an Agreement and Plan of Merger
providing for the merger of a subsidiary of Dow with and into
the corporation. As a result of the merger, the corporation
will become a wholly-owned subsidiary of Dow, and the
corporation's shareholders will receive 0.537 of a share of
Dow common stock for each share of UCC common stock they own
as of the date of the merger. On March 6, 2000, Dow announced
plans for a three-for-one split of its common stock, subject
to the approval of Dow shareholders. If the record date for
the stock split occurs prior to the merger, the number of
shares of Dow common stock to be received for each share of
UCC common stock will be proportionately adjusted. On December
1, 1999, UCC shareholders approved the merger agreement.  The
merger is subject to certain conditions including review by
antitrust regulatory authorities in the United States, Europe
and Canada. The transaction is intended to qualify as a tax-
free reorganization for United States Federal income tax
purposes and is expected to be accounted for under the pooling-
of-interests method of accounting.

Union Carbide does not produce against a backlog of firm
orders; production is geared primarily to the level of
incoming orders and to projections of future demand.
Inventories of finished products, work in process and raw
materials are maintained to meet delivery requirements of
customers and Union Carbide's production schedules.

At year-end 1999, 11,569 people were employed in the
manufacturing facilities, laboratories and offices of the
corporation and its consolidated subsidiaries around the
world.

Raw Materials, Products and Markets-See information herein and
in the 1999 annual report to stockholders on pages 4 and 5.
All products and services are marketed throughout the world by
the corporation's direct sales force, and where appropriate,
augmented by a network of Union Carbide authorized
distributors.

Union Carbide believes it has contracts or commitments for, or
readily available sources of, hydrocarbon feedstocks and fuel
supplies to meet its anticipated needs in all major product
areas. The corporation's operations are dependent upon the
availability of hydrocarbon feedstocks and fuels, which are
purchased from diverse domestic and international sources,
including independent oil and gas producers as well as
integrated oil companies.

The availability and price of hydrocarbon feedstocks, energy
and finished products are subject to plant interruptions and
outages and to market and political conditions in the U.S. and
elsewhere. Operations and products at times may be adversely
affected by legislation, government regulations, shortages, or
international or domestic events.

The business segments of Union Carbide are not dependent to a
significant extent upon a single customer or a few customers.

                              -1-


                        Part I (Cont.)


Patents; Trademarks; Research and Development-Union Carbide
owns a large number of United States and foreign patents that
relate to a wide variety of products and processes, has
pending a substantial number of patent applications throughout
the world and is licensed under a number of patents. These
patents expire at various times over the next 20 years. In the
aggregate, such patents and patent applications are material
to Union Carbide's competitive position. No one patent is
considered to be material. Union Carbide also has a large
number of trademarks. The UNION CARBIDE and UNIPOL trademarks
are material; no other single trademark is material.

Essentially all of Union Carbide's research and development
activities are company-sponsored. The principal research and
development facilities of Union Carbide are indicated in the
discussion of Properties (Item 2) of this Annual Report on
Form 10-K. In addition to the facilities specifically
indicated there, product development and process technology
laboratories are maintained at some plants. Union Carbide
expensed $154 million in 1999, $143 million in 1998, and $157
million in 1997 on company-sponsored research activities to
develop new products, processes, or services, or to improve
existing ones. Certain of Union Carbide's joint ventures
conduct research and development within their business fields.

Environment-See Costs Relating to Protection of the
Environment on page 14 of the 1999 annual report to
stockholders and Note 17 on pages 42 and 43 thereof.

Insurance-Union Carbide's policy is to obtain public liability
and other insurance coverage on terms and conditions and at a
cost that management considers fair and reasonable. Union
Carbide's management believes it has a prudent risk management
policy in effect and it periodically reviews its insurance
coverage as to scope and amount and makes adjustments as
deemed necessary. There is no assurance, however, that Union
Carbide will not incur losses beyond the limits, or outside
the coverage, of its insurance. Such insurance is subject to
substantial corporate retentions.

Competition-Each of the major product and service areas in
which Union Carbide participates is highly competitive. In
some instances competition comes from manufacturers of the
same products as those produced by Union Carbide and in other
cases from manufacturers of different products that may serve
the same markets as those served by Union Carbide's products.
Some of Union Carbide's competitors, such as companies
principally engaged in petroleum operations, have more direct
access to hydrocarbon feedstocks and some have greater
financial resources than Union Carbide.

The Specialties & Intermediates segment is characterized by
differentiated products and is less subject to external
changes in supply/demand relationships than the Basic
Chemicals & Polymers segment. In the Specialties &
Intermediates segment, competition is based primarily on
product functionality and quality, with the more unique
products commanding more significant price premiums.

Products manufactured by the Specialties & Intermediates
segment may compete with a few competitors in many products to
many competitors in selected products. In all, approximately
24 other major specialty chemical companies manufacture
products competitive with those of the Specialties &
Intermediates segment.

The Basic Chemicals & Polymers segment is characterized by
large volume commodity products and is subject to external
changes in supply/demand relationships, including changes in
the strength of the overall economy, customer inventory
levels, industry manufacturing capacity and operating rates
and raw material feedstock costs. Participants in this segment
compete for business primarily on the basis of price and
efficient delivery systems.

The Basic Chemicals & Polymers segment competes with at least
12 other major producers of basic chemicals.

See pages 4 and 5 of the 1999 annual report to stockholders
for information about each segment's principal products.

                              -2-


                        Part I (Cont.)


Union Carbide is a major marketer of petrochemical products
throughout the world. Products that the corporation markets
are largely produced in the United States, while products
marketed by the corporation's joint ventures are principally
produced outside the United States. Competitive products are
produced throughout the world.

Union Carbide's international operations face competition from
local producers and global competitors and a number of risks
inherent in carrying on business outside the United States,
including regional and global economic conditions, risks of
nationalization, expropriation, restrictive action by local
governments and changes in currency exchange rates.

See Note 6 on pages 30 and 31 of the 1999 annual report to
stockholders for a summary of business and geographic segment
information.

Item 2. Properties

In management's opinion, current facilities, together with
planned expansions, will provide adequate production capacity
to meet Union Carbide's planned business activities. Capital
expenditures are discussed on page 16 of the 1999 annual
report to stockholders.

Listed on the following pages are the principal manufacturing
facilities operated by Union Carbide worldwide. Research and
engineering facilities are noted within each of the domestic
and international descriptions below. Most of the domestic
properties are held in fee. Union Carbide maintains numerous
domestic sales offices and warehouses, the majority of which
are leased premises, whose lease terms are scheduled to expire
in five years or less. All principal international
manufacturing properties are either owned or held under long-
term leases. International administrative offices, technical
service laboratories, sales offices and warehouses are owned
in some instances and held under relatively short-term leases
in other instances. The corporation's headquarters is located
in Danbury, Connecticut and is leased.

                              -3-



                        Part I (Cont.)


Principal domestic manufacturing facilities and the principal
products manufactured there are as follows:



                                    
Location         City                     Principal Product(s)

Specialties & Intermediates Segment
California       Torrance                 Latexes
Georgia          Tucker                   Latexes
Illinois         Alsip                    Latexes
Louisiana        Greensburg               Hydroxyethyl cellulose derivatives
Louisiana        Norco (Cypress Plant)    Polypropylene catalysts, polypropylene
                                          catalyst pre-cursor
Louisiana        Taft                     Acrolein and derivatives, acrylic monomers,
                                          caprolactone, UV-curing resins,
                                          cycloaliphatic epoxides, glycol ethers,
                                          polyethylene glycols, ethyleneamines,
                                          surfactants, ethanolamines, oxo alcohols,
                                          epoxidized soybean oil
Louisiana        Taft (Star Plant)        Polyethylene catalysts
New Jersey       Bound Brook              Polyethylene compounds
New Jersey       Edison                   Lanolin and glucose derivatives
New Jersey       Somerset                 Latexes
Puerto Rico      Bayamon                  Latexes
Texas            Garland                  Latexes
Texas            Seadrift                 Ethanolamines, glycol ethers, ethylene-
                                          propylene rubber, polyethylene compounds for
                                          wire & cable, polyethylene catalysts,
                                          polypropylene catalyst pre-cursor
Texas            Texas City               Organic acids and esters, alcohols,
                                          aldehydes, ketones, vinyl acetate, solution
                                          vinyl resins, heat transfer fluids
West Virginia    Institute                Caprolactone derivatives, polyethylene
                                          glycol, hydroxyethyl cellulose, polyethylene
                                          oxide, surfactants, ethylidene norbornene,
                                          glutaraldehyde, ethylene oxide catalysts,
                                          acetone and derivatives
West Virginia    South Charleston         Alkyl alkanolamines, miscellaneous specialty
                                          products, polyalkylene glycols, surfactants,
                                          specialty ketones, polyvinyl acetate resins,
                                          heat transfer fluids, aircraft deicing
                                          fluids, vinyl methyl ether

Basic Chemicals & Polymers Segment
Louisiana        Norco (Cypress Plant)    Polypropylene
Louisiana        Taft                     Ethylene oxide and glycol, olefins
Louisiana        Taft (Star Plant)        Polyethylene
Texas            Seadrift                 Ethylene oxide and glycol, olefins,
                                          polyethylene, polypropylene
Texas            Texas City               Olefins


Research and development for the Specialties & Intermediates
segment is carried on at technical centers in Bound Brook and
Somerset, New Jersey; Tarrytown, New York; Cary, North
Carolina; Houston and Texas City, Texas; and South Charleston,
West Virginia. Research and development for the Basic
Chemicals & Polymers segment is carried on at technical
centers in Bound Brook and Somerset, New Jersey; Houston,
Texas; and South Charleston, West Virginia. Process and design
engineering for both segments is conducted at technical
centers in South Charleston, West Virginia and in Houston,
Texas, in support of domestic and foreign projects.

                              -4-



                        Part I (Cont.)


Principal international manufacturing facilities and the
principal products manufactured there are as follows:

                                              
Country                            City             Principal Product(s)

Specialties & Intermediates Segment
Argentina                          San Lorenzo      Latex
Belgium                            Vilvoorde        Lanolin derivatives
Belgium                            Zwijndrecht      Hydroxyethyl cellulose
Brazil                             Aratu            Hydroxyethyl cellulose
Brazil                             Cabo             Vinyl acetate
Brazil                             Cubatao          Polyethylene
Canada                             Sarnia           Latex
Indonesia                          Jakarta          Latex
Malaysia                           Seremban         Latex
People's Republic of China         Guangdong        Latex, hydroxyethyl cellulose derivatives
People's Republic of China         Shanghai         Latex
Philippines                        Batangas         Latex
Thailand                           Rayong           Latex
United Arab Emirates               Dubai            Latex
United Kingdom                     Wilton           Glycol ethers, ethanolamines

Basic Chemicals & Polymers Segment
Canada                             Prentiss         Ethylene glycol
United Kingdom                     Wilton           Ethylene oxide and glycol


Research and development for the Specialties & Intermediates
segment is carried on at international facilities in
Zwijndrecht, Belgium; Cubatao, Brazil; Montreal East, Canada;
Jurong, Singapore; and Meyrin (Geneva), Switzerland.

Principal locations of the corporation's partnerships and
corporate investments carried at equity and the principal
products manufactured by those entities are as follows:

Specialties & Intermediates:

UOP LLC - a joint venture with Honeywell International, Inc.,
accounted for as a partnership, which is a leading worldwide
supplier of process technology, catalysts, molecular sieves
and adsorbents to the petrochemical and gas-processing
industries. UOP LLC has manufacturing facilities in Mobile,
Alabama; Des Plaines and McCook, Illinois; Shreveport,
Louisiana; Tonawanda, New York; Leverkusen, Germany; Reggio di
Calabria, Italy; and Brimsdown, United Kingdom. UOP has
several joint ventures with manufacturing sites in Hiratsuka
and Yokkaichi, Japan and Shanghai, China. Research and
development is performed at locations in Des Plaines, Illinois
and Mobile, Alabama.

Nippon Unicar Company Limited - a Japan-based producer of
polyethylene and specialty polyethylene compounds and
specialty silicone products. This joint venture with Tonen
Chemical Corporation has manufacturing facilities in Kawasaki
and Komatsu, Japan.

Aspell Polymeres SNC - a France-based producer of polyethylene
and specialty polyethylene compounds. This partnership with
Elf Atochem S.A., a subsidiary of Elf Aquitaine, has a
manufacturing facility in Gonfreville, France.

World Ethanol Company - a U.S.-based partnership with Archer
Daniels Midland Company that supplies ethanol worldwide. This
partnership has manufacturing facilities in Texas City, Texas
and Peoria, Illinois.

                              -5-



                        Part I (Cont.)


Univation Technologies, LLC - a U.S.-based joint venture,
accounted for as a partnership, with ExxonMobil Chemical
Company, a division of Exxon Mobil Corporation, for the
licensing of polyethylene technology. Univation conducts
research, development and commercialization activities on
process technology and single site and other advanced
catalysts for the production of polyethylene. The venture is
also the sales agent for licensing of Union Carbide's UNIPOL
technology. The company's headquarters is located in Houston,
Texas. Research and development and engineering are performed
at locations in Bound Brook, New Jersey; Baytown, Texas;
Houston, Texas; and South Charleston, West Virginia. A
catalyst manufacturing facility is located in Mont Belvieu,
Texas.

Asian Acetyls, Co., Ltd. - a South Korea-based producer of
vinyl acetate monomer used in the production of emulsion
resins by customers in the coatings and adhesives industries.
This corporate joint venture with BP Chemicals and Samsung
Fine Chemicals Company has a manufacturing facility in Ulsan,
South Korea.

OPTIMAL Chemicals (Malaysia) Sdn Bhd - a Malaysian corporate
joint venture with Petroliam Nasional Berhad (PETRONAS) that
is building a facility for the production of ethylene and
propylene derivatives within a world-scale, integrated
chemical complex in Kerteh, Terengganu, Malaysia. This
corporate joint venture, along with two joint ventures in the
corporation's Basic Chemicals & Polymers segment, OPTIMAL
Olefins (Malaysia) Sdn Bhd and OPTIMAL Glycols (Malaysia) Sdn
Bhd, form the OPTIMAL Group.

Basic Chemicals & Polymers:

Polimeri Europa S.r.l. - a Europe-based producer of olefins
and polyethylene resins. This corporate joint venture with
EniChem S.p.A. of Italy operates facilities at Brindisi,
Ferrara, Gela, Priolo and Ragusa, Italy; Dunkirk, France; and
Oberhausen, Germany. The venture is headquartered in Milan,
Italy.

EQUATE Petrochemical Company K.S.C. - a corporate joint
venture with Petrochemical Industries Company and Boubyan
Petrochemical Company, which manufactures ethylene,
polyethylene and ethylene glycol at its world-scale
petrochemicals complex in Shuaiba, Kuwait.

Petromont and Company, Limited Partnership - a Canada-based
olefins and polyethylene resins producer owned jointly with
Ethylec Inc. This partnership has manufacturing facilities at
Montreal and Varennes, Quebec, Canada.

Alberta & Orient Glycol Company Limited - a corporate joint
venture with Mitsui & Co., Ltd., Japan, and Far Eastern
Textile Ltd., Taiwan. This Canada-based producer of ethylene
glycol has a manufacturing facility in Prentiss, Alberta,
Canada.

OPTIMAL Olefins (Malaysia) Sdn Bhd and OPTIMAL Glycols
(Malaysia) Sdn Bhd - Malaysian corporate joint ventures (part
of the OPTIMAL Group) with PETRONAS that are building an
ethane/propane cracker and an ethylene glycol facility, within
a world-scale, integrated chemical complex in Kerteh,
Terengganu, Malaysia.


Item 3. Legal Proceedings

See Note 17 of Notes to Financial Statements on pages 42 and
43 of the 1999 annual report to stockholders.

                              -6-


                        Part I (Cont.)


Item 4. Submission of Matters to a Vote of Security Holders


(a) Special Meeting of Shareholders held on December 1, 1999.

(c) Shareholders  voted  to  adopt  an agreement  and  plan  of  merger
    relating  to  a merger of a subsidiary of The Dow Chemical  Company
    with and into the corporation.

    The vote was:

    FOR          99,929,931 shares or 97.66 percent of the shares voted
    AGAINST       2,398,978 shares or 2.34 percent of shares voted
    ABSTAIN       1,302,554 shares


                              -7-


                            Part II


Item 5. Market for Registrant's Common Equity and Related
        Stockholder Matters

Market and dividend information for the corporation's common
stock is contained on pages 18, 19 and 45 of the 1999 annual
report to stockholders. Information about the stock exchanges
where the stock is traded in the United States is listed on
page 46 of the 1999 annual report to stockholders. The
declaration of dividends is a business decision made from time
to time by the Board of Directors based on the corporation's
earnings and financial condition and other factors the Board
considers relevant.

The number of stockholders of record of the corporation's
common stock is contained on page 1 of the 1999 annual report
to stockholders.

Item 6. Selected Financial Data

Information pertaining to consolidated operations is included
under the captions "From the Income Statement" and "From the
Balance Sheet" and dividend information is included under the
caption "Other Data" in the Selected Financial Data on pages
18 and 19 of the 1999 annual report to stockholders.

Item 7. Management's Discussion and Analysis of Financial
        Condition and Results of Operations

See the information in the 1999 annual report to stockholders,
pages 7 through 17.

Item 7a. Quantitative and Qualitative Disclosures About Market
         Risk

Information pertaining to Quantitative and Qualitative
Disclosures About Market Risk is included under the caption
"Interest Rate and Currency Risk Management" and "Foreign
Operations" in Management's Discussion and Analysis on page 9
of the 1999 annual report to stockholders.

Item 8. Financial Statements and Supplementary Data

The consolidated balance sheet of Union Carbide Corporation
and subsidiaries at December 31, 1999 and 1998 and the
consolidated statements of income, stockholders' equity and
cash flows for each of the years in the three-year period
ended December 31, 1999, together with the report thereon of
KPMG LLP dated January 26, 2000, are contained on pages 20
through 44 of the 1999 annual report to stockholders.

Quarterly income statement data are contained on page 45 of
the 1999 annual report to stockholders.

Item 9. Changes in and Disagreements with Accountants on
        Accounting and Financial Disclosure

Union Carbide has not had any disagreements covered by this
item with KPMG LLP, its independent auditors.

                              -8-



                           Part III


Item 10. Directors and Executive Officers of the Registrant

For background information on the Directors of Union Carbide
Corporation whose terms are expected to continue after the
annual meeting of stockholders and persons nominated to become
Directors, see pages 7 through 10 of the proxy statement for
the annual meeting of stockholders to be held on April 26,
2000.

The principal executive officers of the corporation are as
follows. Data is as of March 17, 2000.


                                                                                    
                                                                                             Year
                                                                                             First
Name                   Age    Position                                                       Elected

William H. Joyce       64     Chairman of the Board, President and Chief Executive Officer   1993
Joseph S. Byck         58     Vice-President                                                 1991
Bruce D. Fitzgerald    60     Vice-President, General Counsel and Secretary                  1999
James F. Flynn         57     Vice-President                                                 1993
Malcolm A. Kessinger   56     Vice-President                                                 1991
Lee P. McMaster        57     Vice-President                                                 1993
Joseph C. Soviero      61     Vice-President                                                 1993
Roger B. Staub         65     Vice-President                                                 1993
John K. Wulff          51     Vice-President, Chief Financial Officer and Controller         1988


There are no family relationships between any officers or
directors of the corporation. There is no arrangement or
understanding between any officer and any other person
pursuant to which the officer was elected an officer. An
officer is elected by the Board of Directors to serve until
the next annual meeting of stockholders and until his
successor is elected and qualified.

The table on the next page gives a summary of the positions
held during at least the past five years by each officer. Each
of the officers has been employed by the corporation for the
past five years.

                              -9-


                       Part III (Cont.)



                                                                                     
Name                     Position                                                          Years Held

William H. Joyce         Chairman of the Board, President and Chief Executive Officer      1996 to present
                         President and Chief Executive Officer                             1995 to 1995
                         President and Chief Operating Officer                             1993 to 1995

Joseph S. Byck           Vice-President                                                    1991 to present

Bruce D. Fitzgerald      Vice-President, General Counsel and Secretary                     1999 to present
                         Deputy General Counsel                                            1987 to 1998

James F. Flynn           Vice-President                                                    1993 to present

Malcolm A. Kessinger     Vice-President                                                    1991 to present

Lee P. McMaster          Vice-President                                                    1993 to present

Joseph C. Soviero        Vice-President                                                    1993 to present

Roger B. Staub           Vice-President                                                    1993 to present

John K. Wulff            Vice-President, Chief Financial Officer and Controller            1996 to present
                         Vice-President, Controller and Principal Accounting Officer       1989 to 1996


For additional information see "Section 16(a) Beneficial
Ownership Reporting Compliance" on page 21 of the proxy
statement for the annual meeting of stockholders to be held on
April 26, 2000.

Item 11. Executive Compensation

See pages 17 through 19 of the proxy statement for the annual
meeting of stockholders to be held on April 26, 2000.

Item 12. Security Ownership of Certain Beneficial Owners and
         Management

See pages 20 and 21 of the proxy statement for the annual
meeting of stockholders to be held on April 26, 2000.

Item 13. Certain Relationships and Related Transactions

See page 10 of the proxy statement for the annual meeting of
stockholders to be held on April 26, 2000.

                             -10-




                            Part IV


Item 14. Exhibits, Financial Statement Schedules and Reports
         on Form 8-K

UNION CARBIDE CORPORATION

(a)  The following documents are filed as part of this report:

     1.   The consolidated financial statements set forth on pages 20
          through 43 and the Independent Auditors' Report set forth on
          page 44 of the 1999 annual report to stockholders are
          incorporated by reference in this Annual Report on Form 10-K.

     2.   The Report on Financial Statement Schedule of KPMG LLP appears
          on page 12 of this Annual Report on Form 10-K.

     3.   The following schedule should be read in conjunction with the
          consolidated financial statements incorporated by reference in
          Item 8 of this Annual Report on Form 10-K. Schedules other than
          those listed have been omitted because they are not applicable.

                                                             Page in this
                                                            Annual Report
                                                             on Form 10-K



       Valuation and Qualifying Accounts (Schedule II),
       three years ended December 31, 1999                          13



(b)  The corporation filed the following Current Reports on Form 8-K for
     the three months ended December 31, 1999.

     1.   Current Report on Form 8-K dated October 25, 1999, contained
          the corporation's press release dated October 25, 1999.

     2.   Current Report on Form 8-K dated November 15, 1999, contained
          the corporation's press release dated November 15, 1999.

     3.   Current Report on Form 8-K dated December 1, 1999, contained
          the corporation's press release dated December 1, 1999.

(c)  Exhibits  -  See Exhibit Index on pages 15 through 17  for  exhibits
     filed with this Annual Report on Form 10-K.


                             -11-


                        Part IV (Cont.)


                Report of Independent Auditors


   The Board of Directors
   Union Carbide Corporation

   Under date of January 26, 2000, we reported on the
   consolidated balance sheets of Union Carbide
   Corporation and subsidiaries as of December 31, 1999
   and 1998, and the related consolidated statements of
   income, stockholders' equity and cash flows for each of
   the years in the three-year period ended December 31,
   1999, as contained on pages 20 through 43 in the 1999
   annual report to stockholders. These consolidated
   financial statements and our report thereon are
   incorporated by reference in the Annual Report on Form
   10-K for the year 1999. In connection with our audits
   of the aforementioned consolidated financial
   statements, we also have audited the related financial
   statement schedule as listed in Item 14(a)3.  This
   financial statement schedule is the responsibility of
   the corporation's management.  Our responsibility is to
   express an opinion on this financial statement schedule
   based on our audits.

   In our opinion, such financial statement schedule, when
   considered in relation to the basic consolidated
   financial statements taken as a whole, presents fairly,
   in all material respects, the information set forth
   therein.


                                            /s/ KPMG LLP
                                            KPMG LLP
   Stamford, Conn.
   January 26, 2000

                             -12-
   

                        Part IV (Cont.)



               Schedule II-Valuation and Qualifying Accounts

Union Carbide Corporation and Consolidated Subsidiaries




                                                                                 
                                                                                    Deductions
                                                                           Items determined to
                                                         Additions           be uncollectible,
                                    Balance at    Charged to  Reclassifed     less recovery of   Balance at
                                  beginning of     costs and   from other   amounts previously       end of
                                        period      expenses     accounts          written off       period

                                                          Millions of dollars, year ended December 31, 1999
Allowance for doubtful accounts            $22            $2          $ -                  $ 5          $19
                                                          Millions of dollars, year ended December 31, 1998
Allowance for doubtful accounts            $11            $3          $ 8                  $ -          $22
                                                          Millions of dollars, year ended December 31, 1997
Allowance for doubtful accounts            $10            $3          $ -                  $ 2          $11


                             -13-


                          Signatures


Pursuant  to  the requirements of Section 13 or 15(d)  of  the
Securities  Exchange  Act of 1934, the  corporation  has  duly
caused  this  report  to  be  signed  on  its  behalf  by  the
undersigned, thereunto duly authorized.


                                  Union Carbide Corporation


March 17, 2000

                                  /s/John K. Wulff
                             by:  John K. Wulff
                                  Vice-President, Chief Financial
                                  Officer and Controller


Pursuant to the requirements of the Securities Exchange Act of
1934,  this  report  has been signed below  by  the  following
persons  on  behalf of the corporation and in  the  capacities
indicated on March 17, 2000.



                                                                   
/s/William H. Joyce                         /s/C. Fred Fetterolf         /s/Rozanne L. Ridgway
William H. Joyce                            C. Fred Fetterolf            Rozanne L. Ridgway
Director, Chairman of the Board,            Director                     Director
President and Chief Executive Officer




/s/John K. Wulff                            /s/Vernon E. Jordan, Jr.     /s/James M. Ringler
John K. Wulff                               Vernon E. Jordan, Jr.        James M. Ringler
Vice-President, Chief Financial Officer     Director                     Director
and Controller




                                            /s/Robert D. Kennedy         /s/Paul J. Wilhelm
                                            Robert D. Kennedy            Paul J. Wilhelm
                                            Director                     Director





                                            /s/Ronald L. Kuehn, Jr.
                                            Ronald L. Kuehn, Jr.
                                            Director



                             -14-


                         Exhibit Index


Exhibit No.

         
 2.1        Agreement and Plan of Merger dated as of August 3, 1999 among the
            corporation, The Dow Chemical Company and Transition Sub Inc. (See Exhibit
            2 of the corporation's Current Report on Form 8-K dated August 3, 1999).

 2.2        Stock Option Agreement dated as of August 3, 1999 between the corporation
            and The Dow Chemical Company (See Exhibit 99.1 to the corporation's Current
            Report on Form 8-K dated August 3, 1999).

 3.1        Amended and Restated Certificate of Incorporation as filed June 25, 1998
            (See Exhibit 3 of the corporation's June 30, 1998 Form 10-Q).

 3.2        By-Laws of the corporation, amended as of September 22, 1999 (See Exhibit
            3.2 of the corporation's Current Report on Form 8-K, dated September 22,
            1999).

 4.1        Indenture dated as of June 1, 1995, between the corporation and the Chase
            Manhattan Bank (formerly Chemical Bank), Trustee (See Exhibit 4.1.2 to the
            corporation's Form S-3 effective October 13, 1995, Reg. No. 33-60705).

 4.2        The corporation will furnish to the Commission upon request any other debt
            instrument referred to in item 601(b)(4)(iii) (A) of Regulation S-K.

10.1        Indemnity Agreement dated as of December 8, 1997, between the corporation
            and James F. Flynn. The Indemnity Agreement filed with the Commission is
            substantially identical in all material respects, except as to the parties
            thereto and dates thereof, with Indemnity Agreements between the
            corporation and each other person who is a director or executive officer of
            the corporation (See Exhibit 10.1 of the corporation's 1997 Form 10-K).

10.2.1      1988 Union Carbide Long-Term Incentive Plan (See Exhibit 10.2.1 of the
            corporation's 1998 Form 10-K).

10.2.2      Amendment to the 1988 Union Carbide Long-Term Incentive Plan effective June
            1, 1989.

10.2.3      Amendment to the 1988 Union Carbide Long-Term Incentive Plan effective
            August 1, 1989.

10.2.4      Resolutions adopted by the Board of Directors of the corporation on
            February 26, 1992, with respect to stock options granted under the 1988
            Union Carbide Long-Term Incentive Plan (See Exhibit 10.2.4 of the
            corporation's 1997 Form 10-K).

10.2.5      Resolutions adopted by the Compensation and Management Development
            Committee of the Board of Directors of the corporation on June 30, 1992,
            with respect to the 1988 Union Carbide Long-Term Incentive Plan (See
            Exhibit 10.2.5 of the corporation's 1997 Form 10-K).

10.2.6      Amendment to the 1988 Union Carbide Long-Term Incentive Plan effective
            October 1, 1997 (See Exhibit 10.2.6 of the corporation's 1997 Form 10-K).

10.3.1      1983 Union Carbide Bonus Deferral Program (See Exhibit 10.4.1 of the
            corporation's 1996 Form 10-K).

10.3.2      Amendment  to  the  1983  Union  Carbide Bonus  Deferral  Program  effective
            January 1, 1992 (See Exhibit 10.3.2 of the corporation's 1997 Form 10-K).

10.4.1      1984  Union Carbide Cash Bonus Deferral Program (See Exhibit 10.5.1  of  the
            corporation's 1996 Form 10-K).


                             -15-



                     Exhibit Index (Cont.)

Exhibit No.

         
10.4.2      Amendment  to  the 1984 Union Carbide Cash Bonus Deferral Program  effective
            January 1, 1986 (See Exhibit 10.5.2 of the corporation's 1996 Form 10-K).

10.4.3      Amendment to the 1984 Union Carbide Cash Bonus Deferral Program effective
            January 1, 1992 (See Exhibit 10.4.3 of the corporation's 1997 Form 10-K).

10.5        Union Carbide Corporation Equalization Benefit Plan, Amended and Restated
            effective January 1, 1998.

10.6        Union Carbide Corporation Supplemental Retirement Income Plan, Amended and
            Restated January 1, 1998.

10.7        Union Carbide Non-Employee Directors' Compensation Deferral Plan effective
            February 1, 1997 (See Exhibit 10.7 of the corporation's 1997 Form 10-K).

10.8        Severance Compensation Agreement, dated February 10, 1998, between the
            corporation and Ron J. Cottle. The Severance Compensation Agreement filed
            with the Commission is substantially identical in all material aspects,
            except as to the parties thereto and dates thereof, with Agreements between
            the corporation and other officers and employees of the corporation (See
            Exhibit 10.8 of the corporation's 1997 Form 10-K).

10.9        Resolution adopted by the Board of Directors of the corporation on November
            30, 1988, with respect to an executive life insurance program for officers
            and certain other employees (See Exhibit 10.9 of the corporation's 1998
            Form 10-K).

10.10       1997 Union Carbide Variable Compensation Plan effective July 1, 1997 (See
            Exhibit 10.10 of the corporation's 1997 Form 10-K).

10.11.1     Union Carbide Corporation Benefits Protection Trust, amended and restated
            effective August 29, 1997 (See Exhibit 10.11.1 of the corporation's 1997
            Form 10-K).

10.11.2     Amendment to the Union Carbide Corporation Benefits Protection Trust
            effective November 1, 1997 (See Exhibit 10.11.2 of the corporation's 1997
            Form 10-K).

10.11.3     Second Amendment to the Union Carbide Corporation Benefits Protection Trust
            effective August 3, 1999.

10.12       Resolutions adopted by the Board of Directors of the corporation on
            February 24, 1988, with respect to the purchase of annuities to cover
            liabilities of the corporation under the Equalization Benefit Plan for
            Participants of the Retirement Program Plan for Employees of Union Carbide
            Corporation and its Participating Subsidiary Companies and the Supplemental
            Retirement Income Plan.

10.13       Resolutions adopted by the Board of Directors of the corporation on June
            28, 1989, with respect to the purchase of annuities to cover liabilities of
            the corporation under the Supplemental Retirement Income Plan.

10.14       Union Carbide Corporation Enhanced Retirement Income Plan, effective
            January 1, 1998.

10.15.1     1994 Union Carbide Long-Term Incentive Plan.

10.15.2     Amendment to the 1994 Union Carbide Long-Term Incentive Plan effective
            October 1, 1997 (See Exhibit 10.15.2 of the corporation's 1997 Form 10-K).


                             -16-



                     Exhibit Index (Cont.)

Exhibit No.

         
10.16.1     Amendment and Restatement to Union Carbide Compensation Deferral Program
            effective October 1, 1995 (See Exhibit 10.28 of the corporation's 1995 Form
            10-K).

10.16.2     Amendment to Union Carbide Compensation Deferral Program effective January
            1, 1995 (See Exhibit 10.17.2 of the corporation's 1996 Form 10-K).

10.16.3     Amendment to Union Carbide Compensation Deferral Program effective December
            31, 1996 (See Exhibit 10.17.3 of the corporation's 1996 Form 10-K).

10.17       Excess Long-Term Disability Plan effective January 1, 1994.

10.18       1995 Union Carbide Performance Incentive Plan (See Appendix A of the
            corporation's proxy statement for the annual meeting of stockholders held
            on April 26, 1995).

10.19.1     1997 Union Carbide Long-Term Incentive Plan (See Appendix A of the
            corporation's proxy statement filed with the Commission March 12, 1997,
            file number: 001-01463).

10.19.2     Amendment to the 1997 Union Carbide Long-Term Incentive Plan effective
            April 23, 1997 (See Exhibit 10.19.2 of the corporation's 1997 Form 10-K).

10.20       1997 Stock Option Plan for Non-Employee Directors of Union Carbide
            Corporation (See Appendix B of the corporation's proxy statement filed with
            the Commission March 12, 1997, file number: 001-01463).

10.21       1997 Union Carbide Corporation EPS Incentive Plan (See Exhibit 10.21 of the
            corporation's 1997 Form 10-K).

10.22       The Mid-Career Hire Plan for Employees of Union Carbide Corporation and Its
            Participating Subsidiary Companies, effective December 3, 1996 (See Exhibit
            10.22 of the corporation's 1997 Form 10-K).

13          The corporation's 1999 annual report to stockholders (such report, except
            for those portions which are expressly referred to in this annual report on
            Form 10-K, is furnished for the information of the Commission and is not
            deemed "filed" as part of the annual report on Form 10-K).

21          Subsidiaries of the corporation.

23          Consent of KPMG LLP.

27          Financial Data Schedule for the year ended December 31, 1999.


Wherever an exhibit listed above refers to another exhibit or
document (e.g., "See Exhibit 6 of . . ."), that exhibit or
document is incorporated herein by such reference.

A copy of any exhibit listed above may be obtained on written
request to the Secretary's Department, Union Carbide
Corporation, 39 Old Ridgebury Road, Danbury, CT 06817-0001.
The charge for furnishing any exhibit is 25 cents per page
plus mailing costs.


                             -17-


UC-1981
PRINTED IN U.S.A.

                             -18-