Establishments primarily engaged in manufacturing synthetic rubber by polymerization or copolymerization. An elastomer for the purpose of this classification is a rubber-like material capable of vulcanization, such as copolymers of butadiene and styrene, or butadiene and acrylonitrile, polybutadienes, chloroprene rubbers, and isobutylene-isoprene copolymers. Butadiene copolymers containing less than 50 percent butadiene are classified in Industry 2821. Natural chlorinated rubbers and cyclized rubbers are considered as semifinished products and are classified in Industry 3069.

• Acrylate type rubbers
• Acrylate-butadiene rubbers
• Acrylic rubbers
• Butadiene rubbers
• Butadiene-acrylonitrile copolymers (more than 50 percent butadiene)
• Butadiene-styrene copolymers (more than 50 percent butadiene)
• Butyl rubber
• Chlorinated rubbers, synthetic
• Chloroprene type rubbers
• Chlorosulfonated polyethylenes
• Cyclo rubbers, synthetic
• Elastomers, vulcanizable (synthetic rubber)
• Epichlorohydrin elastomers
• Estane
• Ethylene-propylene rubbers
• Fluoro rubbers
• Fluorocarbon derivative rubbers
• Isobutylene-isoprene rubbers
• Isocyanate type rubber
• Isoprene rubbers, synthetic
• Neoprene
• Nitrile type rubber
• Nitrile-butadiene rubbers
• Nitrile-chloroprene rubbers
• Polybutadienes
• Polyethylenes, chlorosulfonated
• Polyisobutylene (synthetic rubber)
• Polyisobutylene-isoprene elastomers
• Polymethylene rubbers
• Polysulfides
• Pyridine-butadiene copolymers
• Pyridine-butadiene rubbers
• Rubber, synthetic
• Silicone rubbers
• Stereo regular elastomers
• Styrene-butadiene rubbers (50 percent or less styrene content)
• Styrene-chloroprene rubbers
• Styrene-isoprene rubbers
• Thiol rubbers
• Urethane rubbers
• Vulcanized oils