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                                                                      EXHIBIT 12

                 CABOT CORPORATION AND CONSOLIDATED SUBSIDIARIES
      STATEMENT REGARDING COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES

                      (Dollars in millions, except ratios)




                                                  Nine Months
                                                     ended
                                                    June 30                 Years ended September 30
                                                  -----------  ---------------------------------------------------
                                                     1999        1998       1997       1996       1995       1994
                                                    ------     -------    -------     ------    -------     ------
                                                                                          
Earnings:
   Pre-tax income from continuing operations        $127.3      $168.0     $117.0     $279.8     $256.0     $118.3
   Distributed income of affiliated companies          7.6         7.5       10.4       11.2       11.7        5.6
   Add fixed charges:
      Interest on indebtedness                        34.3        42.0       43.2       41.7       35.6       41.7
      Portion of rents representative of
         the interest factor                           3.8         5.1        4.9        4.8        5.5        5.9
                                                    ------      ------     ------     ------     ------     ------
   Income as adjusted                               $173.0      $222.6     $175.5     $337.5     $308.8     $171.5

Fixed charges:
   Interest on indebtedness                         $ 34.3      $ 42.0     $ 43.2     $ 41.7     $ 35.6     $ 41.7
   Portion of rents representative of
      the interest factor                              3.8         5.1        4.9        4.8        5.5        5.9
                                                    ------      ------     ------     ------     ------     ------
      Total fixed charges                           $ 38.1      $ 47.1     $ 48.1     $ 46.5     $ 41.1     $ 47.6

      Ratio of earnings to fixed charges               4.5         4.7        3.6        7.3        7.5        3.6
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