Exhibit 21

ü  W. R. GRACE & CO., a Delaware

U.S. SUBSIDIARIES

February 2, 2012

ü  Chapter 11 Filing — April 2, 2001

	SUBSIDIARY NAME	STATE OF INCORPORATION
	Alltech Associates, Inc.	IL
	AP Chem Incorporated	MD
	Construction Products Dubai, Inc.	DE
ü	Darex Puerto Rico, Inc.	DE
	De Neef Construction Chemicals (US) Inc.	TX
ü	Dewey and Almy, LLC	DE
ü	Ecarg, Inc.	NJ
ü	Gloucester New Communities Company, Inc.	NJ
	Grace Asia Pacific, Inc.	DE
	Grace Chemicals, Inc.	DE
ü	Grace Chemical Company of Cuba	IL
	Grace Collections, Inc.	DE
ü	Grace Energy Corporation	DE
ü	Grace Europe, Inc.	DE
	Grace Germany Holdings, Inc.	DE
ü	Grace International Holdings, Inc.	DE
	Grace Latin America, Inc.	DE
	Grace Management Services, Inc.	DE
ü	Grace PAR Corporation	DE
	Grace Receivables Purchasing, Inc.	DE
ü	W. R. Grace Capital Corporation	NY
ü	W. R. Grace & Co.-Conn.	CT
ü	W. R. Grace Land Corporation	NY
ü	Guanica-Caribe Land Development Corporation	DE
ü	Hanover Square Corporation	DE
	Ichiban Chemical Co., Inc.	DE
ü	Kootenai Development Company	MT
ü	Remedium Group, Inc.	DE
	Verifi LLC (f/k/a GR 2008 LLC)	MD
ü	Water Street Corporation	DE

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NON-U.S. SUBSIDIARIES

COUNTRY/
SUBSIDIARY NAME

AUSTRALIA

Alltech Associates (Australia) Pty. Ltd.

Grace Australia Pty. Ltd.

BELGIUM

De Neef Construction Chemicals NV

Grace Construction Products N.V.

Grace S.A. (f/k/a Grace N.V.)

Grace Silica N.V.

Inverco Benelux N.V.

BRAZIL

Grace Brasil Ltda.

Grace Davison Ltda.

CANADA

GEC Divestment Corporation Ltd.

Grace Canada, Inc.

W. R. Grace Finance (NRO) Ltd.

CHILE

Grace Quimica Compania Limitada

CHINA - PEOPLE’S REPUBLIC OF

Grace China Ltd.

Grace Trading (Shanghai) Co., Ltd.

COLOMBIA

Grace Colombia S.A.

CUBA

Envases Industriales y Comerciales, S.A.

Papelera Camagueyana, S.A.

FRANCE

Alltech France S.A.R.L.

De Neef France S.A.R.L.

Grace Produits de Construction SAS

W. R. Grace S.A.

GERMANY

Alltech Grom GmbH

De Neef Deutschland GmbH

Grace Bauprodukte GmbH

Grace Darex GmbH

Grace Energy GmbH (f/k/a Grace Holding GmbH)

Grace Europe Holding GmbH

Grace GP GmbH

Grace Management GP GmbH

Grace Silica GmbH

2

COUNTRY/
SUBSIDIARY NAME

GREECE

Grace Hellas E.P.E.

HONG KONG

Alltech Applied Science Labs (HK) Limited

Alltech Scientific (China) Limited

De Neef Construction Chemicals (China) Limited

W. R. Grace (Hong Kong) Limited

HUNGARY

Grace Értékesito Kft.

INDIA

Grace Davison Chemicals India Pvt. Ltd.
(f/k/a Flexit Laboratories Private Ltd.)

W. R. Grace & Co. (India) Private Limited

INDONESIA

PT. Grace Specialty Chemicals Indonesia

IRELAND

Amicon Ireland Limited

Grace Construction Products (Ireland) Limited

Trans-Meridian Insurance (Dublin) Ltd.

ITALY

Alltech Italia S.R.L.

W. R. Grace Italiana S.p.A.

JAPAN

Grace Chemicals K.K.

Grace Japan Kabushiki Kaisha

KOREA

Grace Korea Inc.

LUXEMBOURG

Grace Luxembourg S.a.r.l.

MALAYSIA

W. R. Grace (Malaysia) Sendiran Berhad

W. R. Grace Specialty Chemicals (Malaysia) Sdn. Bhd.

MEXICO

Grace Container, S. A. de C. V.

W. R. Grace Holdings, S. A. de C. V.

NETHERLANDS

Alltech Applied Science B.V.

Amicon B.V.

Denac Nederland B.V.

LC Service B.V.

W. R. Grace B.V.

NETHERLANDS ANTILLES

W. R. Grace N.V.

NEW ZEALAND

Grace (New Zealand) Limited

3

COUNTRY/
SUBSIDIARY NAME

PANAMA

W. R. Grace (Panama) S.A.

PHILIPPINES

W. R. Grace (Philippines), Inc.

W.R. Grace Operations Center, Inc.

POLAND

Grace Sp. z o.o.

PORTUGAL

De Neef Portugal, LDA

RUSSIA

Darex CIS LLC

SINGAPORE

De Neef Asia Pte. Ltd.

W. R. Grace (Singapore) Private Limited

SOUTH AFRICA

Grace Davison (Proprietary) Limited

W. R. Grace Africa (Proprietary) Limited

SPAIN

Grace, S.A.

De Neef Technologies S.L.

Pieri Especialidades, S.L.

SWEDEN

De Neef Scandanavia AB

Grace AB

Grace Catalyst AB

Grace Sweden AB

SWITZERLAND

De Neef (CH) AG

Grace Construction Products S.A. (f/k/a Pieri S.A.)

Union Societe Financiere SA

TAIWAN

W. R. Grace Taiwan, Inc.

THAILAND

W. R. Grace (Thailand) Limited

UNITED KINGDOM

A.A. Consultancy & Cleaning Company Limited

Alltech Associates Applied Science Limited

Cormix Limited

Borndear 1 Limited

Borndear 2 Limited

Borndear 3 Limited

Darex UK Limited

De Neef UK LTD

Emerson & Cuming (Trading) Ltd.

Emerson & Cuming (UK) Ltd.

Exemere Limited

Grace Construction Products Limited

Pieri U.K. Limited

4

COUNTRY/
SUBSIDIARY NAME

Servicised Ltd.

W. R. Grace Limited

VENEZUELA

Grace Venezuela, S.A.

Inversiones GSC, S.A.

VIETNAM

W. R. Grace Vietnam Company Limited

5