A wide choice of basic polymers (rubbers) is available, and some of these rubbers can be blended or compounded to obtain different properties. Rubbers or elastomers are mixed with various chemicals in order to provide the reinforcement and curing ingredients required to produce the physical properties necessary for the service conditions. Polymers Most Commonly Used in Sheet RubberNATURAL Isoprene, natural Excellent physical properties inculding abrasion and low temperature resistance. Poor resistance to petroleum-based fluids. SBR Styrene-butadiene Good physical properties and abrasion resistance. Poor resistance to petroleum based fluids. NEOPRENE Chloroprene Good weathering resistance. Flame retarding. Moderate resistance to petroleum based fluids. Good physical properties. BUNA-N Nitrile-butadiene Excellent resistance to petroleum based fluids. Good physical properties. BUTYL Isobutene-Isoprene Very good weathering resistance. Excellent dielectric properties. Low permeability to air. Good physical properties. Poor resistance to petroleum-based fluids. ETHYLENE-PROPYLENE Ethylene-propylene-diene Excellent ozone, chemical, and aging resistance. Poor resistance to petroleum-based fluids.
CLOTH INSERTED SBR/Neoprene Cotton, Nylon or other fiber is inserted between layers of above listed elastomers or polymers to reduce stretch and flow in service conditions. Properties of Most Common Elastomers Sizing
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