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Rubber Specifications

This table provided is a general guide to the properties of compounds containing natural and synthetic rubbers.

Most rubbers used in the manufacture of rubber hose and rubber linings contain about 60% by weight of rubber, the balance is made up of chemicals each contributing something to the physical properties of the finished product, or as an aid in processing. The selection of these components is very much a matter of compromise since the full achievement of one property is usually at the expense of another.

 

Common Name	ASTM Designation	Composition	Temp Limits	General Properties
Natural	NR	Isoprene, Natural	70 Deg C	Excellent physical properties including abrasion and low temperature resistance. Poor resistance to petroleum based fluids.
Neoprene	CR	Chloroprene	90 Deg C	Good weather resistance. Flame retarding. Moderate resistance to petroleum based fluids. Good physical properties.
Bromo Butyl	IIR	Isobutene-Isoprene	100 Deg C	Very good weathering resistance. Low permeability to air. Good physical properties. Poor resistance to petroleum based fluids.
Nitrile	NBR	Nitrile-Butadiene	110 Deg C	Excellent resistance to petroleum based fluids. Moderate resistance to aromatics. Good physical properties.
SBR	SBR	Styrene-Butadiene	80 Deg C	Good physical properties including abrasion resistance. Poor resistance to petroleum based fluids.
Hypalon	CSM	Chloro-Sulfonyl-Polyethylene	110 Deg C	Excellent ozone, weathering and acid resistance. Good abrasion and heat resistance. Fair resistance to petroleum based fluids.
Ethylene Propylene	EPDM	Ethylene-Propylene-Diene-Terpolymer	110 Deg C	Excellent ozone, chemical and ageing characteristics. Poor resistance to petroleum based fluids.
Viton	FPM	Fluorinated Rubber	180 Deg C	Excellent chemical and temperature resistance. Good resistance to petroleum based products and ozone. Poor physical properties.
Data is presented for use only as a general guide and should not be the basis for design decisions.