<ARTICLE> 5
<LEGEND>
This Schedule contains summary financial information extracted from Union
Carbide Corporation's Annual Report on Form 10-K for the year ended December
31, 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>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-END>                               DEC-31-1999
<CASH>                                              41
<SECURITIES>                                         0
<RECEIVABLES>                                     1132
<ALLOWANCES>                                         0
<INVENTORY>                                        680
<CURRENT-ASSETS>                                  2150
<PP&E>                                            9057
<DEPRECIATION>                                    4536
<TOTAL-ASSETS>                                    7957
<CURRENT-LIABILITIES>                             1789
<BONDS>                                           1869
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           158
<OTHER-SE>                                        2459
<TOTAL-LIABILITY-AND-EQUITY>                      7957
<SALES>                                           5870
<TOTAL-REVENUES>                                  5870
<CGS>                                             4609
<TOTAL-COSTS>                                     4609
<OTHER-EXPENSES>                                   562<F1>
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 133
<INCOME-PRETAX>                                    422
<INCOME-TAX>                                       108
<INCOME-CONTINUING>                                311
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                           20
<NET-INCOME>                                       291
<EPS-BASIC>                                       2.18
<EPS-DILUTED>                                     2.13
<FN>
<F1>Other expenses are equal to Research and development of 154 and Depreciation
and amortization of 408.
</FN>