Cabot (CBT) 10-Q 2006 Q2 Quarterly report

EXHIBIT 32

Certifications Pursuant to 18 U.S.C. Section 1350,
as Adopted Pursuant to Section 906 of the
Sarbanes-Oxley Act of 2002

In connection with the filing of the Quarterly Report on Form 10-Q for the quarter ended March 31, 2006 (the “Report”) by Cabot Corporation (the “Company”), each of the undersigned hereby certifies pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

1.	The Report fully complies with the requirements of section 13 (a) or 15 (d) of the Securities Exchange Act of 1934, as amended; and
2.	The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ Kennett F. Burnes  

Kennett F. Burnes 

Chairman of the Board, President
and Chief Executive Officer 
May 9, 2006 

/s/ Jonathan P. Mason  

Jonathan P. Mason 

Executive Vice President and
Chief Financial Officer 
May 9, 2006