<ARTICLE> 5
<LEGEND>
This schedule contains summary financial information extracted from Union
Carbide Corporation's Form 10-Q for the quarter ended September 30, 1999, and is
qualified in its entirety by reference to such financial statements.
</LEGEND>
<CIK> 0000100790
<NAME> UNION CARBIDE CORPORATION
<MULTIPLIER> 1,000,000

                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-END>                               SEP-30-1999
<CASH>                                              36
<SECURITIES>                                         0
<RECEIVABLES>                                     1112
<ALLOWANCES>                                         0
<INVENTORY>                                        608
<CURRENT-ASSETS>                                  2013
<PP&E>                                            8872
<DEPRECIATION>                                    4444
<TOTAL-ASSETS>                                    7660
<CURRENT-LIABILITIES>                             1624
<BONDS>                                           1868
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           157
<OTHER-SE>                                        2367
<TOTAL-LIABILITY-AND-EQUITY>                      7660
<SALES>                                           4318
<TOTAL-REVENUES>                                  4318
<CGS>                                             3369
<TOTAL-COSTS>                                     3369
<OTHER-EXPENSES>                                   416<F1>
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                  98
<INCOME-PRETAX>                                    349
<INCOME-TAX>                                        90
<INCOME-CONTINUING>                                217
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                           20
<NET-INCOME>                                       197
<EPS-BASIC>                                       1.48
<EPS-DILUTED>                                     1.45
<FN>
<F1>Other expenses are equal to research and development of 114 and depreciation
and amortization of 302.
</FN>