Exhibit 21

Subsidiaries of Air Products and Chemicals, Inc.

The following is a list of the Company’s consolidating subsidiaries, as of 30 September 2008, except for certain subsidiaries of the Registrant which do not in the aggregate constitute a significant subsidiary as that term is defined in Rule 12b-2 under the Securities Exchange Act of 1934. This list does not include equity affiliate investments and cost investments.

UNITED STATES

All companies are incorporated in the State of Delaware unless otherwise indicated.

Registrant — Air Products and Chemicals, Inc.
AHS Seating and Mobility Georgia, Inc. (Georgia)
APMTG Helium LLC
Air Products Didcot LLC
Air Products (Rozenburg), Inc.
Air Products Asia, Inc.
Air Products Caribbean Holdings, Inc.
Air Products China, Inc.
Air Products Electronics, LLC
Air Products Energy Enterprises, L.P.
Air Products Energy Holdings, Inc.
Air Products Europe, Inc.
Air Products Healthcare Southeast, LLC
Air Products Helium, Inc.
Air Products HyCal Company, L.P. (California)
Air Products Hydrogen Company, Inc.
Air Products International Corporation
Air Products LLC
Air Products Manufacturing Corporation
Air Products Performance Manufacturing, Inc.
Air Products Seating and Mobility, Inc.
Air Products Trinidad Services, Inc.
American Homecare Supply IV Georgia, LLC
American Homecare Supply Mid-Atlantic, LLC
American Homecare Supply New York, LLC
American Homecare Supply West Virginia, Inc.
American Homecare Supply, LLC
AmHealth Group, LLC
APCI Ref-Fuel Company
APCI (U.K.), Inc.
Collins I.V. Care, LLC
Denmark’s, LLC
DependiCare Home Health, LLC
Ducolake, Inc. (Indiana)
East Coast Oxygen Co.
Genox Homecare, LLC
Goar, Allison and Associates, Inc. (Texas)
Harvest Energy Technology, Inc. (California)
Laurel Mountain Medical Supply, LLC
Lakeway Medical Rentals, LLC
Middletown Oxygen Company, Inc.
Mosso’s Medical Supply Company, LLC
Nightingale Medical of Indiana, LLC (Indiana)
Olin — DNT Limited Partnership
Prodair Corporation
Pure Air Holdings Corp.
Pure Air on the Lake (I), Inc.
Pure Air on the Lake (IV), Inc.
SCWC Corp.
Skychain LLC
Stockton CoGen (I), Inc.
Ultra Care, LLC

ARGENTINA

Terapias Medicas Domiciliarias, S.A.

AUSTRIA

Air Products Gesellschaft mbH

BELGIUM

Air Products S.A.
Air Products Management S.A.
Napro S.A.
Medigaz, S.A.

BERMUDA

Asia Industrial Gas Company Ltd.

BRAZIL

Air Products Brasil Ltda.

CANADA

Air Products Canada Ltd./Prodair Canada Ltee

CHINA

Air Products and Chemicals (Beijing) Distribution Co., Ltd.
Air Products and Chemicals (Changxing) Co., Ltd.
Air Products and Chemicals (Changzhou) Co., Ltd.
Air Products and Chemicals (Chengdu) Co., Ltd.
Air Products and Chemicals (Chongqing) Co., Ltd.
Air Products and Chemicals (China) Investment Co. Ltd.
Air Products and Chemicals (Fujian) Co., Ltd.
Air Products and Chemicals (Guangzhou) Co., Ltd.
Air Products and Chemicals (Fuzhou) Co., Ltd.
Air Products and Chemicals (Nanjing) Co., Ltd.
Air Products and Chemicals (Ningbo) Co., Ltd.
Air Products and Chemicals (Putian) Co., Ltd.
Air Products and Chemicals (Shanghai) Co. Ltd.
Air Products and Chemicals (Tangshan) Co., Ltd.
Air Products and Chemicals (Tianjin) Co., Ltd.
Air Products and Chemicals (Zhuhai) Co., Ltd.
Air Products and Chemicals (Zibo) Co., Ltd.
Air Products and Chemicals (Kunshan) Gases Co., Ltd.
Air Products and Chemicals (Nanjing) Gases Co., Ltd.
Air Products and Chemicals (Shenzhen) Gases Co., Ltd.
Air Products and Chemicals (Zhengzhou) Hi-Tech Co., Ltd.
Air Products and Chemicals (Nanjing) Specialty Amines Co., Ltd.
Air Products and Chemicals (Shanghai) Electronics Gases Co., Ltd.
Air Products and Chemicals (Shanghai) Gases Co., Ltd.
Air Products and Chemicals (Shanghai) On-Site Gases Co., Ltd.
Air Products and Chemicals (Shanghai) Systems Co. Ltd.
Air Products and Chemicals (Shenzhen) Co., Ltd.
Air Products and Chemicals (Tongxiang) Co., Ltd.
Air Products and Chemicals (Zhangjiagang) Co., Ltd.
Air Products (Shanghai) Co., Ltd.
Beijing AP BAIF Gas Industry Co., Ltd.
Chun Wang Industrial Gases (H.K.) Limited
Permea China, Ltd.

CZECH REPUBLIC

Air Products spol s.r.o.

FRANCE

Air Products Medical S.a.r.l.
Air Products SAS
Prodair et Cie S.C.S.
Prodair S.A.S.
Henno Oxygene S.A.S.
Hold’Air SAS
Lida SAS
Domisante SAS
Union Mobiliere Industrielle S.A.R.L.

GERMANY

Air Products GmbH
Air Products Medical GmbH
Air Products Powders GmbH

INDONESIA

PT Air Products Indonesia

IRELAND

Air Products Ireland Limited
Air Products Medical Ireland Limited

ITALY

Air Products Italia S.r.l.

JAPAN

Air Products Japan, Inc.

KOREA

Air Products Korea Electronics, Inc.
Air Products ACT Korea Limited
Air Products HYT Inc.
Han Mi Specialty Gases Co. Ltd.
Shinil Cryogenic Materials, Ltd.

MALAYSIA

Air Products Malaysia Sdn Bhd
Air Products Shared Services Sdn. Bhd

MEXICO

Air Products and Chemicals de Mexico, S.A. de C.V.
Air Products Infra Nitrogeno, S. de R.L. de C.V.

THE NETHERLANDS

Air Products Chemicals Europe B.V.
Air Products Holdings B.V.
Air Products Investments B.V.
Air Products Leasing B.V.
Air Products Nederland B.V.
Air Products Utilities B.V.
Air Products Polymers B.V.

NORWAY

Air Products A/S

PERU

Air Products Peru S.A.C.

POLAND

Air Products Sp. z.o.o.
Roboprojekt Sp. z.o.o

PORTUGAL

Gases Industriais, S.A.R.L.

ROMANIA

Air Products Hidrogen S.R.L.

RUSSIA

Air Products O.O.O.

SINGAPORE

Air Products and Chemicals (S) Pte. Ltd.
Air Products Singapore Pte. Ltd.

SLOVAKIA

Air Products Slovakia s.r.o.

SPAIN

Air Products Iberica, S.L.
Air Products Investments Espana, S.L.
Air Products Services Europe, S.A.
Air Products Sud Europa, S.L.
Matgas 2000 A.I.E.
Oxigenol, S.A.
Sociedad Espanola de Carburos Metalicos S.A.

SWITZERLAND

Air Products Switzerland Sàrl

TAIWAN

Airpro Gases Co., Ltd.
Air Products San Fu Co., Ltd.
Air Products Electronics Taiwan Limited
Air Products Taiwan Co., Ltd.
Air Products Taiwan Holdings, LLC
Blue Ocean Industrial Gases Co., Ltd.

THAILAND

Air Products Asia (Technology Center) Ltd.

TRINIDAD AND TOBAGO

Air Products Unlimited

UNITED KINGDOM

Air Products (BR) Limited
Air Products (Chemicals) Public Limited Company
Air Products (GB) Limited
Air Products Group Limited
Air Products PLC
Air Products (UK) Limited
Air Products Yanbu Limited
Anchor Chemical (UK) Limited
Anchor Chemical International Limited
Ancomer Limited
Cryomed Limited
Cryoservice Limited
Prodair Services Limited
Protexeon Limited
Air Products (Chemicals) Teesside Limited