Improved Sour Gasoline Resistance of Epichlorohydrin Elastomer Fuel Hose

Laboratory studies suggest that isolated failures of epichlorohydrin copolymer (ECO) fuel hoses on cars equipped with electronic fuel injection systems were caused by exposure to “sour” (oxidized) gasoline.

Results of an intensive program indicate that epichlorohydrin homopolymer (CO) elastomer is significantly more resistant to the effects of sour gasoline than ECO. The incorporation of a suitable stabilizer further enhances the sour gasoline resistance of CO elastomer and permits successful completion of both six-week static and circulation test procedures.