EXHIBIT
21  üW. R. GRACE & CO., a Delaware corporation U.S.
SUBSIDIARIES 12/31/2009  üChapter 11 Filing  April 2, 2001  SUBSIDIARY NAME
  
  CO. #
  
  STATE OF
  INCORPORATIONü
  
  A-1 Bit & Tool
  Co., Inc.
  
  458
  
  DE* Advanced
  Refining Technologies LLC
  
  268
  (f/k/a
  930)
  
  DEü
  
  Alewife Boston Ltd.
  
  070
  
  MAü
  
  Alewife Land
  Corporation
  
  069
  
  MAAlltech
  Associates, Inc.
  
  259
  
  ILü
  
  Amicon, Inc.
  
  174
  
  DEAP Chem Incorporated
  
  436
  
  MDü
  
  CB
  Biomedical, Inc.
  
  125
  
  DEü
  
  CCHP, Inc.
  
  074
  
  DEü
  
  Coalgrace, Inc.
  
  824
  
  DEü
  
  Coalgrace II, Inc.
  
  835
  
  DEConstruction Products
  Dubai, Inc.
  
  121
  
  DEü
  
  Creative Food N Fun
  Company
  
  587
  
  DEü
  
  Darex Puerto
  Rico, Inc.
  
  798
  
  DEü
  
  Del Taco
  Restaurants, Inc.
  
  557
  
  DEü
  
  Dewey and Almy, LLC
  
  406
  
  DEü
  
  Ecarg, Inc.
  
  519
  
  NJü
  
  Five Alewife Boston
  Ltd.
  
  071
  
  MAü
  
  G C Limited Partners
  I, Inc.
  
  465
  
  DEü
  
  G C
  Management, Inc.
  
  539
  
  DEü
  
  GEC Management
  Corporation
  
  689
  
  DEü
  
  GN Holdings, Inc.
  
  073
  
  DEü
  
  GPC Thomasville Corp.
  
  637
  
  DEü
  
  Gloucester New Communities
  Company, Inc.
  
  572
  
  NJü
  
  Grace A-B Inc.
  
  625
  
  DEü
  
  Grace A-B II Inc.
  
  827
  
  DEGrace Asia
  Pacific, Inc.
  
  107
  
  DEGrace
  Chemicals, Inc.
  
  710
  
  DEü
  
  Grace Chemical Company
  of Cuba
  
  305
  
  ILGrace
  Collections, Inc.
  
  316
  
  DEü
  
  Grace Culinary
  Systems, Inc.
  
  479
  
  MDü
  
  Grace Drilling Company
  
  877
  
  DE  
 * Ownership of Advanced Refining Technologies LLC
is 55% W. R. Grace & Co.-Conn. (#001) and 45% Chevron USA, Inc.;
certain enumerated actions of the Executive Committee require unanimous consent.  1


SUBSIDIARY NAME
  
  CO. #
  
  STATE OF
  INCORPORATIONü
  
  Grace Energy
  Corporation
  
  681
  
  DEü
  
  Grace
  Environmental, Inc.
  
  198
  
  DEü
  
  Grace Europe, Inc.
  
  407
  
  DEGrace Germany
  Holdings, Inc.
  
  
  
  DEü
  
  Grace H-G Inc.
  
  506
  
  DEü
  
  Grace H-G II Inc.
  
  828
  
  DEü
  
  Grace Hotel Services
  Corporation
  
  480
  
  DEü
  
  Grace International
  Holdings, Inc.
  
  543
  
  DEGrace Latin
  America, Inc.
  
  263
  
  DEGrace Management
  Services, Inc.
  
  485
  
  DEü
  
  Grace Offshore Company
  
  822
  
  LAü
  
  Grace PAR Corporation
  
  621
  
  DEü
  
  Grace Petroleum Libya
  Incorporated
  
  880
  
  DEGrace Receivables
  Purchasing, Inc.
  
  041
  
  DEü
  
  Grace Tarpon
  Investors, Inc.
  
  462
  
  DEü
  
  Grace Ventures Corp.
  
  664
  
  DEü
  
  Grace
  Washington, Inc.
  
  197
  
  DEü
  
  W. R. Grace Capital
  Corporation
  
  563
  
  NYü
  
  W. R. Grace &
  Co.-Conn.
  
  001
  
  CTü
  
  W. R. Grace Land
  Corporation
  
  523
  
  NYü
  
  Gracoal, Inc.
  
  856
  
  DEü
  
  Gracoal II, Inc.
  
  848
  
  DEü
  
  Guanica-Caribe Land
  Development Corporation
  
  376
  
  DEü
  
  Hanover Square
  Corporation
  
  516
  
  DEü
  
  Homco
  International, Inc.
  
  631
  
  DEIchiban Chemical
  Co., Inc.
  
  028
  
  DEü
  
  Kootenai Development
  Company
  
  079
  
  MTü
  
  L B Realty, Inc.
  
  495
  
  DEü
  
  Litigation
  Management, Inc.
  
  317
  
  DEü
  
  Monolith Enterprises,
  Incorporated
  
  477
  
  DCü
  
  Monroe
  Street, Inc.
  
  481
  
  DEü
  
  MRA Holdings Corp.
  
  075
  
  DEü
  
  MRA
  Intermedco, Inc.
  
  076
  
  DEü
  
  MRA Staffing
  Systems, Inc.
  
  077
  
  DENZ Alltech, Inc.
  
  
  
  ILü
  
  Remedium
  Group, Inc.
  
  063
  
  DEü
  
  Southern Oil,
  Resin & Fiberglass, Inc.
  
  318
  
  FLü
  
  Water Street
  Corporation
  
  548
  
  DE  2


NON-U.S.
SUBSIDIARIES  COUNTRY/ SUBSIDIARY NAME  ARGENTINAW. R. Grace Argentina
  S.A.WRG Argentina, S.A.AUSTRALIAAlltech Associates
  (Australia) Pty. Ltd.Grace Australia Pty.
  Ltd.BELGIUMGrace Construction
  Products N.V.Grace S.A. (f/k/a Grace
  N.V.)Grace Silica N.V.Inverco Benelux N.V.BRAZILGrace Brasil Ltda.Grace Davison Ltda.CANADAGEC Divestment
  Corporation Ltd.Grace Canada, Inc.W. R. Grace Finance
  (NRO) Ltd.CHILEGrace Quimica Compania
  LimitadaCHINA - PEOPLES REPUBLIC OFGrace China Ltd.Grace Trading
  (Shanghai) Co., Ltd.COLOMBIAGrace Colombia S.A.CUBAEnvases Industriales y Comerciales, S.A.Papelera Camagueyana,
  S.A.FRANCEAlltech France S.A.R.L.Grace Produits de
  Construction SASW. R. Grace S.A.GERMANY *Advanced Refining
  Technologies GmbHAlltech Grom GmbHGrace Bauprodukte GmbHGrace Darex GmbHGERMANY (Continued)Grace Energy GmbH (f/k/a Grace Holding GmbH)Grace Europe Holding
  GmbHGrace GP GmbH  
 *Grace GmbH, formerly the main operating entity in
Germany, was restructured into two partnerships:  1.Grace GmbH & Co. KG (#252), and 2.Grace Manufacturing GmbH & Co. KG (#253),  both of which are listed in the Partnerships
section.  3


COUNTRY/ SUBSIDIARY NAME  Grace Management GP GmbHGrace Silica GmbHGREECEGrace Hellas E.P.E.HONG KONGAlltech Applied Science Labs (HK) LimitedAlltech Scientific (China) LimitedW. R. Grace (Hong Kong) LimitedHUNGARYGrace Értékesito Kft.INDIAGrace Davison Chemicals India Pvt. Ltd.(f/k/a
  Flexit Laboratories Private Ltd.)W. R. Grace & Co. (India) Private LimitedINDONESIAPT. Grace Specialty
  Chemicals IndonesiaIRELANDAmicon Ireland LimitedGrace Construction
  Products (Ireland) LimitedTrans-Meridian
  Insurance (Dublin) Ltd.ITALYAlltech Italia S.R.L.W. R. Grace Italiana S.p.A.JAPANAdvanced Refining
  Technologies K.K.Grace Chemicals K.K.Grace Japan Kabushiki
  KaishaKOREAGrace Korea Inc.MALAYSIAW. R. Grace (Malaysia)
  Sendiran BerhadW. R. Grace Specialty
  Chemicals (Malaysia) Sdn. Bhd.MEXICOGrace Container, S. A.
  de C. V.W. R. Grace Holdings,
  S. A. de C. V.NETHERLANDSAlltech Applied Science B.V.Amicon B.V.Denac Nederland B.V.LC Service B.V.Storm van Bentem en Kluyver B.V.W. R. Grace B.V.NETHERLANDS ANTILLESW. R. Grace N.V.NEW ZEALANDGrace (New Zealand)
  LimitedPHILIPPINESW. R. Grace (Philippines), Inc.POLANDGrace Sp. z o.o.  4


COUNTRY/ SUBSIDIARY NAME  RUSSIADarex CIS LLCSINGAPOREW. R. Grace (Singapore)
  Private LimitedSOUTH AFRICAGrace Davison (Proprietary) LimitedW. R. Grace Africa (Proprietary) LimitedSPAINGrace, S.A.Pieri Especialidades, S.L.SWEDENGrace ABGrace Catalyst ABGrace Sweden ABSWITZERLANDGrace Construction Products S.A.(f/k/a
  Pieri S.A.)TAIWANW. R. Grace Taiwan, Inc.THAILANDW. R. Grace (Thailand) LimitedUNITED KINGDOMA.A. Consultancy & Cleaning Company LimitedAlltech Associates
  Applied Science LimitedCormix LimitedBorndear 1 LimitedBorndear 2 LimitedBorndear 3 LimitedDarex UK LimitedEmerson &
  Cuming (Trading) Ltd.Emerson &
  Cuming (UK) Ltd.Exemere LimitedGrace Construction
  Products LimitedPieri U.K. LimitedServicised Ltd.W. R. Grace LimitedVENEZUELAGrace Venezuela, S.A.Inversiones GSC, S.A.VIETNAMW. R. Grace Vietnam
  Company Limited  5