Use of a rubber composition for forming an inner tube of a rubber hose for a fuel system

摘要

To lessen the formation of fatty acid zinc salts in the step of immersing in fuel, a magnesium compound or a calcium compound capable of reacting with fatty acids in preference to zinc is added to a rubber composition forming an inner tube. In the case where the rubber composition is a sulfur cure system essentially containing zinc white as a cure promoter, it is not essentially required to add fatty acids such as stearic acid. In the case where the rubber composition is a peroxide cure system, it is not essentially required to add zinc white and fatty acids such as stearic acid, though it is favorable not to add zinc oxide.