Various Elastomers and Rubbers—Exxon Chemicals

TABLE 2.12 VARIOUS ELASTOMERS AND RUBBERS-EXXON CHEMICALS 

Exxon butyl rubber and its chlorinated analog, chlorobutyl rubber are isobutylene-isoprene copolymers. They are basically inert, nonpolar, stable elastomers which exhibit outstanding resistance to attack by a great many different chemicals. 

VISTALON elastomers are classified generically as either ethylene-propylene copolymers (EPM) or ethylene-propylene terpolymers EPDM). All grades of VISTALON EPM have a completely saturated hydrocarbon chain which makes them highly resistant to attack by chemical agents such as oxygen, ozone, acids, and the like that seek to react at the site of a double bond. 

Exxon elastomers display good resistance to attack by animal or vegetable oils. However, they are like other petroleum derived synthetic polymers in that their resistance to the attack of hydrocarbons, oils, and other petroleum based chemicals is low. Only VISTALON 6505 blends with nitrile and polychloroprene rubbers maintain good physical properties after prolonged exposure to these materials. 

CHEMICAL RESISTANCE OF COMPOUND BASED ON INTERMEDIATE UNSATURATION BUTYL RUBBER 

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TABLE 2.12 VARIOUS ELASTOMERS AND RUBBERS-EXXON CHEMICALS (continued)... 

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