Exhibit 12

Cabot Corporation and Consolidated Subsidiaries

Statement Regarding Computation of Ratio of Earnings (Loss) to Fixed Charges

(Amounts in millions, except ratios)

	Years ended September 30
	2010		2009			2008		2007		2006
Earnings (Loss):
Pre-tax income (loss) from continuing operations	$	208	$	(102	)	$	112	$	168	$	97
Distributed income of affiliated companies		6		1			2		10		5
Add fixed charges:
Interest on indebtedness		40		30			38		34		27
Portion of rents representative of the interest factor		8		9			9		8		6
Preferred stock dividend		—		—			—		1		2
Income (loss) as adjusted	$	262	$	(65	)	$	161	$	221	$	137
Fixed charges:
Interest on indebtedness	$	40	$	30		$	38	$	34	$	27
Capitalized interest		1		4			3		1		2
Portion of rents representative of the interest factor		8		9			9		8		6
Preferred stock dividend		—		—			—		1		2
Total fixed charges	$	49	$	43		$	50	$	44	$	37
Ratio of earnings (loss) to fixed charges		5		N/A			3		5		4