Akzo-Nobel
Industry leader selling catalysts and other property enhancing additives.

Albemarle
Albemarle Corporation is a supplier of specialty chemicals and chemical intermediates. Their products are used to make polymers, detergents, personal care products, agricultural pesticides and fertilizers, pharmaceuticals and photographic chemicals.

Chemcyclopedia Online
Buyer's guide of commercially available chemicals from Chemical and Engineering News.

Ciba
Industry leader selling many additives for plastics.

Clariant
Producer and seller of color concentrates for the plastics industry.

Degussa-Hüls
Products include carbon black, organosilanes and precipitated silica.

Dow Corning
World leader for silicone-based products.

DuPont Coatings & Release Systems
DuPont branch with emphasis on mold release coatings products.

Ferro
Ferro sells a comprehensive list of additives including heat stabilizers, lubricants, acid scavengers, UV stabilizers, antimicrobials, waxes, catalysts and vulcanizing agents. This site is well written with easy to access information.

GenCorp
Sealants producer.

Johns-Manville
Manufacturer of fillers and reinforcements for thermoplastics.

Kraton
Easy to navigate, well organized web site from this Shell spin-off. Assisted search provides additional useful information for the (relatively) uninformed.

Nanocor
Nanocor markets nanoclay fillers.

Rohm & Haas
This site is easy to navigate and contains pertinent information on their products line that includes impact modifiers, heat stabilizers, lubricants and biostabilizers.

Uniform Color Corporation
UCC offers custom compounded color concentrates for the plastics industry.