**EXHIBIT24**

POWEROF ATTORNEY

The undersignedhereby appoints ROBERT M. TAROLA, MARK A. SHELNITZ, and MICHAEL W. CONRON ashis true and lawful attorneys-in-fact for the purpose of signing the AnnualReport on Form 10-K of W. R. GRACE & CO. for the year ended Decem­ber 31,2006, and all amend­ments thereto, to be filed with the Securi­ties andExchange Commission.  Each of suchattorneys-in-fact is appointed with full power to act without the other.
|        |   | /s/ John F. Akers                       |
|--------|--------|-----------------------------------------|
|   |   |      John F.  Akers |

 

Dated:  February 28, 2007

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POWEROF ATTORNEY

The undersignedhereby appoints ROBERT M. TAROLA, MARK A. SHELNITZ, and MICHAEL W. CONRON ashis true and lawful attorneys-in-fact for the purpose of signing the AnnualReport on Form 10-K of W. R. GRACE & CO. for the year ended Decem­ber 31,2006, and all amend­ments thereto, to be filed with the Securi­ties andExchange Commission.  Each of suchattorneys-in-fact is appointed with full power to act without the other.
|        |   | /s/ H. Furlong Baldwin                       |
|--------|--------|----------------------------------------------|
|   |   |      H.  Furlong Baldwin |

 

# Dated:  February28, 2007

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POWEROF ATTORNEY

The undersignedhereby appoints ROBERT M. TAROLA, MARK A. SHELNITZ, and MICHAEL W. CONRON ashis true and lawful attorneys-in-fact for the purpose of signing the AnnualReport on Form 10-K of W. R. GRACE & CO. for the year ended Decem­ber 31,2006, and all amend­ments thereto, to be filed with the Securi­ties andExchange Commission.  Each of suchattorneys-in-fact is appointed with full power to act without the other.
|        |   | /s/ Ronald C. Cambre                       |
|--------|--------|--------------------------------------------|
|   |   |      Ronald C.  Cambre |

 

Dated:  February 28, 2007

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POWEROF ATTORNEY

The undersignedhereby appoints ROBERT M. TAROLA, MARK A. SHELNITZ, and MICHAEL W. CONRON asher true and lawful attorneys-in-fact for the purpose of signing the AnnualReport on Form 10-K of W. R. GRACE & CO. for the year ended Decem­ber 31,2006, and all amend­ments thereto, to be filed with the Securi­ties andExchange Commission.  Each of suchattorneys-in-fact is appointed with full power to act without the other.
|        |   | /s/ Marye Anne Fox                       |
|--------|--------|------------------------------------------|
|   |   |      Marye  Anne Fox |

 

Dated:  February 28, 2007

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POWEROF ATTORNEY

The undersignedhereby appoints ROBERT M. TAROLA, MARK A. SHELNITZ, and MICHAEL W. CONRON ashis true and lawful attorneys-in-fact for the purpose of signing the AnnualReport on Form 10-K of W. R. GRACE & CO. for the year ended Decem­ber 31,2006, and all amend­ments thereto, to be filed with the Securi­ties andExchange Commission.  Each of suchattorneys-in-fact is appointed with full power to act without the other.
|        |   | /s/ John J. Murphy                       |
|--------|--------|------------------------------------------|
|   |   |      John J.  Murphy |

 

Dated:  February 28, 2007

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POWEROF ATTORNEY

The undersignedhereby appoints ROBERT M. TAROLA, MARK A. SHELNITZ, and MICHAEL W. CONRON ashis true and lawful attorneys-in-fact for the purpose of signing the AnnualReport on Form 10-K of W. R. GRACE & CO. for the year ended Decem­ber 31,2006, and all amend­ments thereto, to be filed with the Securi­ties andExchange Commission.  Each of suchattorneys-in-fact is appointed with full power to act without the other.
|        |   | /s/ Paul J. Norris                       |
|--------|--------|------------------------------------------|
|   |   |      Paul J.  Norris |

 

Dated:  February 28, 2007

 

 

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POWEROF ATTORNEY

The undersignedhereby appoints ROBERT M. TAROLA, MARK A. SHELNITZ, and MICHAEL W. CONRON ashis true and lawful attorneys-in-fact for the purpose of signing the AnnualReport on Form 10-K of W. R. GRACE & CO. for the year ended Decem­ber 31,2006, and all amend­ments thereto, to be filed with the Securi­ties andExchange Commission.  Each of suchattorneys-in-fact is appointed with full power to act without the other.
|        |   | /s/ Christopher J. Steffen                       |
|--------|--------|--------------------------------------------------|
|   |   |      Christopher  J. Steffen |

 

 

Dated:  February 28, 2007

 

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POWEROF ATTORNEY

The undersignedhereby appoints ROBERT M. TAROLA, MARK A. SHELNITZ, and MICHAEL W. CONRON ashis true and lawful attorneys-in-fact for the purpose of signing the AnnualReport on Form 10-K of W. R. GRACE & CO. for the year ended Decem­ber 31,2006, and all amend­ments thereto, to be filed with the Securi­ties andExchange Commission.  Each of suchattorneys-in-fact is appointed with full power to act without the other.
|        |   | /s/ Mark E. Tomkins                       |
|--------|--------|-------------------------------------------|
|   |   |      Mark E.  Tomkins |

 

 

Dated:  February 28, 2007

 

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POWEROF ATTORNEY

The undersignedhereby appoints ROBERT M. TAROLA, MARK A. SHELNITZ, and MICHAEL W. CONRON ashis true and lawful attorneys-in-fact for the purpose of signing the AnnualReport on Form 10-K of W. R. GRACE & CO. for the year ended Decem­ber 31,2006, and all amend­ments thereto, to be filed with the Securi­ties andExchange Commission.  Each of suchattorneys-in-fact is appointed with full power to act without the other.
|        |   | /s/ Thomas A. Vanderslice                       |
|--------|--------|-------------------------------------------------|
|   |   |      Thomas A.  Vanderslice |

 

Dated:  February 28, 2007

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