EXHIBIT
24  POWER
OF ATTORNEY  The undersigned hereby
appoints HUDSON LA FORCE III, MARK A. SHELNITZ, and MICHAEL W. CONRON as his
true and lawful attorneys-in-fact for the purpose of signing the Annual Report
on Form 10-K of W. R. GRACE & CO. for the year ended December 31,
2009, and all amendments thereto, to be filed with the Securities and Exchange
Commission.  Each of such
attorneys-in-fact is appointed with full power to act without the other.   /s/ John F. AkersJohn
  F. Akers   Dated:  February 24, 2010


POWER
OF ATTORNEY  The undersigned hereby
appoints HUDSON LA FORCE III, MARK A. SHELNITZ, and MICHAEL W. CONRON as his
true and lawful attorneys-in-fact for the purpose of signing the Annual Report
on Form 10-K of W. R. GRACE & CO. for the year ended December 31,
2009, and all amendments thereto, to be filed with the Securities and Exchange
Commission.  Each of such
attorneys-in-fact is appointed with full power to act without the other.   /s/ H. Furlong BaldwinH. Furlong
  Baldwin   Dated:  February 24, 2010


POWER
OF ATTORNEY  The undersigned hereby
appoints HUDSON LA FORCE III, MARK A. SHELNITZ, and MICHAEL W. CONRON as his
true and lawful attorneys-in-fact for the purpose of signing the Annual Report
on Form 10-K of W. R. GRACE & CO. for the year ended December 31,
2009, and all amendments thereto, to be filed with the Securities and Exchange
Commission.  Each of such
attorneys-in-fact is appointed with full power to act without the other.   /s/ Ronald C. CambreRonald C. Cambre   Dated:  February 24, 2010


POWER
OF ATTORNEY  The undersigned hereby
appoints HUDSON LA FORCE III, MARK A. SHELNITZ, and MICHAEL W. CONRON as her
true and lawful attorneys-in-fact for the purpose of signing the Annual Report
on Form 10-K of W. R. GRACE & CO. for the year ended December 31,
2009, and all amendments thereto, to be filed with the Securities and Exchange
Commission.  Each of such
attorneys-in-fact is appointed with full power to act without the other.   /s/ Marye Anne FoxMarye Anne Fox   Dated:  February 24, 2010


POWER
OF ATTORNEY  The undersigned hereby
appoints HUDSON LA FORCE III, MARK A. SHELNITZ, and MICHAEL W. CONRON as his
true and lawful attorneys-in-fact for the purpose of signing the Annual Report
on Form 10-K of W. R. GRACE & CO. for the year ended December 31,
2009, and all amendments thereto, to be filed with the Securities and Exchange
Commission.  Each of such
attorneys-in-fact is appointed with full power to act without the other.   /s/ John J. MurphyJohn J. Murphy   Dated:  February 24, 2010


POWER
OF ATTORNEY  The undersigned hereby
appoints HUDSON LA FORCE III, MARK A. SHELNITZ, and MICHAEL W. CONRON as his
true and lawful attorneys-in-fact for the purpose of signing the Annual Report
on Form 10-K of W. R. GRACE & CO. for the year ended December 31,
2009, and all amendments thereto, to be filed with the Securities and Exchange
Commission.  Each of such
attorneys-in-fact is appointed with full power to act without the other.   /s/ Christopher J.
  SteffenChristopher J.
  Steffen   Dated:  February 24, 2010


POWER
OF ATTORNEY  The undersigned hereby
appoints HUDSON LA FORCE III, MARK A. SHELNITZ, and MICHAEL W. CONRON as his
true and lawful attorneys-in-fact for the purpose of signing the Annual Report
on Form 10-K of W. R. GRACE & CO. for the year ended December 31,
2009, and all amendments thereto, to be filed with the Securities and Exchange
Commission.  Each of such
attorneys-in-fact is appointed with full power to act without the other.   /s/ Mark E. TomkinsMark E. Tomkins   Dated:  February 24, 2010


POWER
OF ATTORNEY  The undersigned hereby
appoints HUDSON LA FORCE III, MARK A. SHELNITZ, and MICHAEL W. CONRON as his
true and lawful attorneys-in-fact for the purpose of signing the Annual Report
on Form 10-K of W. R. GRACE & CO. for the year ended December 31,
2009, and all amendments thereto, to be filed with the Securities and Exchange
Commission.  Each of such
attorneys-in-fact is appointed with full power to act without the other.   /s/ Thomas A.
  VandersliceThomas
  A. Vanderslice   Dated:  February 24, 2010