Haldor Topsøe A/S
- Research and development in heterogeneous catalysis, licensing of process know-how, production and sale of catalysts, and engineering of process plants for the fertilizer, petrochemical, and refining industry and for environmental protection.
- http://www.topsoe.com/

Huzhou Xinaote Pharmaceutical & Chemical Co., Ltd.
- Manufacturer of pharmaceutical intermediates and actives, neutraceuticals, and tin mercaptide plastic additives. China.
- http://www.acetylacetone.net

Hefei Keyuan Application Chemical Institute
- Manufacturer of chemical end-use products, including coatings and surface protectants, cleaning agents, and lubricants, for home, car care, and industrial applications. Located in China.
- http://www.kychem.com.cn

Hebei Jiheng Group Co., Ltd.
- Manufacturer of electrochemical inorganics such as persulfates, bromates, and bromites, specialty organics, and pharmaceutical ingredients and intermediates. Located in China.
- http://www.jihenggroup.com/

Hangzhou Luyuan Fine Chemicals Co., Ltd.
- Manufacturer and supplier of desiccnats and de-oxygen fresh-keeping agents.
- http://www.aauu.net/english/

HaiNing FengMing Chlorophyll Co., Ltd.
- Producer and provider of natural pigments, foodstuff additives, nutritional enhancements and pharmaceutical chemicals.
- http://www.chlorophyll-cn.com

Hemlock Semiconductor Corporation
- Manufacturer of polysilicon crystalline for the electronic industry and high purity chemicals for the fiber optic and related industries.
- http://www.hscpoly.com/

Huntsman Corporation
- Manufactures basic products for the chemicals, plastics, detergent, personal care, rubber and packaging industries.
- http://www.huntsman.com/

Hercules, Inc.
- Manufactures chemical specialties used in making a variety of products for the process chemicals and services business and functional products business.
- http://www.herc.com/

H3R, Inc.
- Buys, sells, and recycles Halon 1211 & 1301, and Halon Fire Extinguishers.
- http://www.h3r.com/

Hobo, Inc.
- Chemical formulators and manufacturers.
- http://www.hoboinc.com/

Hichem
- Production of chemicals and chemical glass.
- http://www.cmail.cz/hichem/en/index_en.htm

Hur Chemical & Contract Packaging, Inc.
- One of the largest and most modern sanitation chemical manufacturing companies. The most state-of-the-art technology, R&D, and contract packaging.
- http://www.hurchem.com/