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10-Q - 10-Q - W R GRACE & COa2203839z10-q.htm
EX-32 - EX-32 - W R GRACE & COa2203839zex-32.htm
EX-31.(I)2 - EX-31.(I)2 - W R GRACE & COa2203839zex-31_i2.htm
EX-31.(I)1 - EX-31.(I)1 - W R GRACE & COa2203839zex-31_i1.htm
EXCEL - IDEA: XBRL DOCUMENT - W R GRACE & COFinancial_Report.xls

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EXHIBIT 15

May 6, 2011

Securities and Exchange Commission
100 F Street, N.E.
Washington, D.C. 20549
Commissioners:

        We are aware that our report dated May 6, 2011 on our review of interim financial information of W. R. Grace & Co. (the "Company") for the three-month periods ended March 31, 2011 and March 31, 2010 and included in the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2011, is incorporated by reference in its Registration Statements on Form S-8 (Nos. 333-37024 and 333-173785).

Very truly yours,

/s/ PRICEWATERHOUSECOOPERS LLP
McLean, Virginia




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