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Commercial grades of rubber are usually blends consisting of one principal polymer and other less costly polymers that are compatible with the named polymer. Primary examples of commercial grades are commercial neoprene, commercial Nitrile, and commercial EPDM.

The types of rubber we use are:

Natural Rubber: Natural polyisoprene offers an excellent balance of properties, resulting in outstanding performance in many demanding mechanical applications.

SBR: a synthetic copolymer composed of styrene and butadiene, is used more often than any of the other 
synthetics produced today.

Neoprene: is a polymer chloroprene and is available in many varieties including nonsulfur "W" and the more common sulfur modified"GN" types. Neoprene is known for its resistance to oil, gasoline, sunlight, ozone and oxidation.

Nitrile: is a copolymer of butadiene and acrylonitrile and is recommended when excellent resistance to petroleum oils and gasoline is required. 

EP/EPDM: They are ethylene propylene (EP) which uses a peroxide cure system and ethylene propylene diene methylene terpolymer (EPDM) which uses a sulfur cure system. These polymers are recognized for their resistance to weathering and high temperatures. The EP rubbers have slightly better heat resistance than the EPDM rubbers; however, the EPDM rubbers are easier to process and manufacture.

Silicone:  is a semi-organic synthetic. The molecular structure of silicone rubber results in a very flexible, but weak, chain. Silicones are very stable at low and high temperatures. Although fillers may improve properties somewhat, tear and tensile strengths remain relatively low.

Viton: provides excellent resistance to compression set at high temperatures which accounts for its ability to maintain sealing force and remain tough and elastic even after long exposure to 392 degree F. air or 300 degree F. oil.


We use two different types of molding; Compression Molding and Transfer Molding. The basic principle of molding rubber goods involves placing an uncured, thermoplastic elastomer composition in a heated metal mold. The stock softens with heat and flows when pressure is applied, filling the cavities.