- Arakawa Chemical (USA) Inc
 - Chicago - Supplier of chemical products made from petroleum resins and monomer-based synthetic resins used in the manufacture of adhesives, sealants, inks, plastics, and coatings. - Austin Chemical Company, Inc.
- Buffalo Grove - Serving the pharmaceutical, agricultural and specialty chemical industries, supplying raw materials from investigational to commercial levels.
- Avatar Corporation
- Hickory Hills - Offers the complete line of products for the food, drug and cosmetic industries. Avatar is USDA H-1 and 3H authorized and kosher certified.
- Biosynth
- Naperville - Manufacturer/distributor of organic chemicals used in microbiology, clinical diagnostics, pharmaceuticals, molecular biology, and immunology for production or research.
- C.P. Hall Co.
- Chicago - Supplier of plasticizers and performance additives to the polymer industries worldwide.
- Chem-Flow, Inc.
- Addison - Manufacturing chemical feed systems.
- Crystal Chem, Inc.
- Chicago - Biochemicals, enzymes, immunochemicals and peptides.
- D.A. Stuart Company
- Warrenville - Manufactures metal-working fluids.
- Daubert Coated Products, Inc.
- Westchester - Volatile corrosion inhibitor (VCI) products.
- DF Goldsmith Chemical & Metal Corp
- Evanston - Distiller, supplier, distributor of mercury, inorganic chemicals and precious metals.
- Diversified CPC International
- Channahon - Manufactures and distributes aerosol propellants and foam blowing agents.
- Donlar Corporation
- Bedford Park - Manufactures polyaspartate products for a variety of uses ranging from oil and water treatment to agricultural applications.
- Eichrom Industries, Inc.
- Darien - Metals separations company involved in the fields of hydrometallurgy, ion exchange resins, radionuclides, dye removal and iron control.
- Flavors of North America, Inc.
- Carol Stream - Creates and manufacturers flavours for use in the food, beverage, pharmaceutical, and nutraceutical industries.
- Gurtler Chemicals
- South Holland - Manufacturing products for the powdered laundry business, as well as water treatment, warewashing and building maintenance applications.
- INX International Ink Co.
- Chicago
- Kelleher, Helmrich and Associates, Inc.
- Munster - MSDS management software and consulting.
- Kerley Ink
- Broadview - Manufactures inks for heatset web, business forms, litho and news. Wholesale to other ink mfrs.
- LabPersonnel, Inc.
- Des Plaines - Providing chemists, biologists, and lab technicians on a temporary and direct hire basis.
- Long Wing Trading (U.S.A.), Inc.
- Burr Ridge - Marketing and sales of pharmaceutical raw materials, chemicals, intermediates, food and feed additives as well as herbal products.
- McIntyre Group
- University Park - Manufactures and markets specialty chemicals, surfactants, detergent blends, lubricants, conditioning agents and preservatives for the personal care and industrial markets.
- Nalco Chemical Company
- Naperville - Producer of specialty chemicals and services for water and industrial process treatment.
- Pfanstiehl Laboratories, Inc.
- Waukegan
- Polyurethane Manufacturers Association
- Glen Ellyn - The trade association of the cast polyurethane processing industry. Serving processors, material and equipment suppliers.
- Rierden Chemical and Trading Company
- Libertyville - Reseller of fine and industrial chemicals sourced domestically and abroad.
- Sunnyside Corporation
- Wheeling - Manufacturer/distributor of paint related solvents and chemicals, lubricating oils, metalworking oils and cleaners.
- Velsicol Chemical Corporation
- Rosemont - Manufacturing products for the adhesives, sealant, coating, flame retardant and agricultural pesticide markets.
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