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Chemical Guide
 

1. Temperature of material transmitted:
Higher temperatures increase the effects of chemicals on rubber compound. The increase varies with the polymer and the chemical. A compound quite suitable at room temperature might fail very quickly at higher temperatures.

2. Service conditions:
A rubber compound usually swells when exposed to a chemical. With a given percent of swell, a hose tube may function satisfactorily if the hose is in a static condition, but fail quickly if the hose os subject to flexing.

3. The grade
Basic rubber polymers are sometimes mixed or blended together to enhance a particular property for a specific service. The reaction to a particular chemical blend of polymers may, therefore, somewhat different from the reaction to the single ones. When in doubt, a sample of the compound should always be tested with the particular chemical it is to handle.

General chemical resistance of rubber hose compounds.

Common name ASTM designation D1418-93 Composition General Properties
Natural rubber NR Isopropene rubber Excellent physical properties, including abrasion resistance. Not oil resistant.
SBR SBR Styrene-butadiene rubber Good physical properties, including abrasion resistance. Not oil resistant.
Butyl rubber IIR Isobutene-isopropene rubber Very good weathering resistance. Low permeability to air. Good physical properties. Poor resistance to petroleum based fluids.
EPDM EPDM Ethylene-propylene-diene-terpolymer Good general purpose polymer. Excelent heat, ozone and weathering resistance. Not oil resisntant.
Cross linked polyethylene XLPE Cross linked polyethylene Excellent resistance to most solvents, oils and chemicals. Do not confuse with chemical properties of standard polyethylene.
Ultra high molecular weight polyethylene UHMWPE Ultra high molecular weight polyethylene Excellent resistance to most solvents, chemicals and hydrocarbons. Excellent abrasion and wear resistance. Inert and suitable for food contact. Do not confuse with chemical properties of standar polyethylene.
Teflon/fluorocarbon resin PTFE Polytetra-fluoroethylene  Excellent chemical and solvent resistance. Inert to most materials. Smooth anti-adhesive surface, easy to clean.
Nitrile rubber NBR Acrylonitrile-butadience rubber Excellent oil resistance. Good physical properties.
Neoprene CR Chloroprene rubber Excellent weathering resistance. Flame retardant. Good oil resistant. Good physical properties.
Hypalon® CSM Chloro-sulfonated polyethylene Excellent ozone, weathering and acid resistance. Good abrasion and heat resistance. Can be compounded for good oil resistance.
Polyurethane AU Polyster urethane Excellent abrasion and wear resistance. Not resistant to hydrolysis.
Viton FKM Fluorocarbon rubber Excellent high temperature resistance, particularly in air or oil. Very good resistance to chemicals.