EXHIBIT24

POWER OF ATTORNEY

The undersignedhereby appoints ROBERT M.  TAROLA,  MARK  A.SHELNITZ, and MICHAEL W. CONRON as his true and lawfulattorneys-in-fact for the purpose of signing the Annual Report on Form10-K of W. R. GRACE & CO. for the year ended December31,  2005, and all amendments thereto, to be filed with theSecurities and Exchange Commission. Each of such attorneys-in-fact isappointed with full power to act without theother.

|  | /s/ John F.Akers |
|--|------------------|

|  |
|--|
|  |  |  |
|  |

|  | John F.Akers |
|--|--------------|

Dated:    February  23,2006

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EXHIBIT24

POWER OF ATTORNEY

The undersignedhereby appoints ROBERT M.  TAROLA,  MARK  A.SHELNITZ, and MICHAEL W. CONRON as his true and lawfulattorneys-in-fact for the purpose of signing the Annual Report on Form10-K of W. R. GRACE & CO. for the year ended December31,  2005, and all amendments thereto, to be filed with theSecurities and Exchange Commission. Each of such attorneys-in-fact isappointed with full power to act without theother.

|  | /s/ H. FurlongBaldwin |
|--|-----------------------|

|  |
|--|
|  |  |  |
|  |

|  | H.Furlong Baldwin |
|--|-------------------|

Dated:    February  23,2006

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EXHIBIT24

POWER OF ATTORNEY

The undersignedhereby appoints ROBERT M.  TAROLA,  MARK  A.SHELNITZ, and MICHAEL W. CONRON as his true and lawfulattorneys-in-fact for the purpose of signing the Annual Report on Form10-K of W. R. GRACE & CO. for the year ended December31,  2005, and all amendments thereto, to be filed with theSecurities and Exchange Commission. Each of such attorneys-in-fact isappointed with full power to act without theother.

|  | /s/ Ronald C.Cambre |
|--|---------------------|

|  |
|--|
|  |  |  |
|  |

|  | RonaldC. Cambre |
|--|-----------------|

Dated:    February  23,2006

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EXHIBIT24

POWER OF ATTORNEY

The undersignedhereby appoints ROBERT M.  TAROLA,  MARK  A.SHELNITZ, and MICHAEL W. CONRON as her true and lawfulattorneys-in-fact for the purpose of signing the Annual Report on Form10-K of W. R. GRACE & CO. for the year ended December31,  2005, and all amendments thereto, to be filed with theSecurities and Exchange Commission. Each of such attorneys-in-fact isappointed with full power to act without theother.

|  | /s/ Marye Anne Fox |
|--|--------------------|

|  |
|--|
|  |  |  |
|  |

|  | Marye AnneFox |
|--|---------------|

Dated:    February  23,  2006

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EXHIBIT24

POWER OF ATTORNEY

The undersignedhereby appoints ROBERT M.  TAROLA,  MARK  A.SHELNITZ, and MICHAEL W. CONRON as his true and lawfulattorneys-in-fact for the purpose of signing the Annual Report on Form10-K of W. R. GRACE & CO. for the year ended December31,  2005, and all amendments thereto, to be filed with theSecurities and Exchange Commission. Each of such attorneys-in-fact isappointed with full power to act without theother.

|  | /s/ John J.Murphy |
|--|-------------------|

|  |
|--|
|  |  |  |
|  |

|  | John J.Murphy |
|--|---------------|

Dated:    February  23,2006

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EXHIBIT24

POWER OF ATTORNEY

The undersignedhereby appoints ROBERT M.  TAROLA,  MARK  A.SHELNITZ, and MICHAEL W. CONRON as his true and lawfulattorneys-in-fact for the purpose of signing the Annual Report on Form10-K of W. R. GRACE & CO. for the year ended December31,  2005, and all amendments thereto, to be filed with theSecurities and Exchange Commission. Each of such attorneys-in-fact isappointed with full power to act without theother.

|  | /s/ Paul J.Norris |
|--|-------------------|

|  |
|--|
|  |  |  |
|  |

|  | Paul J.Norris |
|--|---------------|

Dated:    February  23,2006

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EXHIBIT24

POWER OF ATTORNEY

The undersignedhereby appoints ROBERT M.  TAROLA,  MARK  A.SHELNITZ, and MICHAEL W. CONRON as his true and lawfulattorneys-in-fact for the purpose of signing the Annual Report on Form10-K of W. R. GRACE & CO. for the year ended December31,  2005, and all amendments thereto, to be filed with theSecurities and Exchange Commission. Each of such attorneys-in-fact isappointed with full power to act without theother.

|  | /s/ Thomas A.Vanderslice |
|--|--------------------------|

|  |
|--|
|  |  |  |
|  |

|  | ThomasA. Vanderslice |
|--|----------------------|

Dated:    February  23,2006

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