Exhibit 12.1

CABOT CORPORATION AND CONSOLIDATED SUBSIDIARIES

STATEMENT REGARDING COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES

(Amounts in millions, except ratios)

	Nine months ended						Fiscal year ended September 30
	June 30, 2009			June 30, 2008			2008			2007			2006			2005			2004
Earnings:
Pre-tax (loss) income from continuing operations	$	(92	)	$	96		$	112		$	168		$	97		$	(93	)	$	164
Distributed income of affiliated companies		2			2			2			7			5			3			2
Add fixed charges:
Interest on indebtedness		23			28			38			34			27			29			30
Portion of rents representative of the interest factor		7			7			9			8			6			3			3
Preferred stock dividend		—			—			—			1			2			3			3
(Loss) earnings as adjusted	$	(60	)	$	133		$	161		$	218		$	137		$	(55	)	$	202
Fixed charges:
Interest on indebtedness	$	23		$	28		$	38		$	34		$	27		$	29		$	30
Capitalized interest		2			2			3			1			2			2			—
Portion of rents representative of the interest factor		7			7			9			8			6			3			3
Preferred stock dividend		—			—			—			1			2			3			3
Total fixed charges	$	32		$	37		$	50		$	44		$	37		$	37		$	36
Ratio of earnings to fixed charges		N/A	1		3.6	x		3.2	x		5.0	x		3.7	x		N/A	2		5.6	x

(1) The earnings to fixed charges ratio is negative because of the loss. The total dollar amount of the deficiency is $92 million.

(2) The earnings to fixed charges ratio is negative because of the loss. The total dollar amount of the deficiency is $92 million.