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The purpose of this paper is to describe how molecules in a fluid move (permeate) through a solid material. The paper will describe permeation on a molecular level and discuss the general relationships between different types of fluids and difFerent forms of solid materials. A general understanding of the behavior of molecules at the fluid/solid interface should be useful to engineers responsible for selecting permeation resistant materials. As a specific example, the interaction of various automotive fuel mixtures and fluoropolymer barrier materials will be presented.

This paper presents the permeation rates for fuel hose and tubing made from nylon and fluoroplastics when exposed, primarily, to M20 fuel. Room temperature permeation rates were obtained using several types of commercially supplied hose and tubing. The permeation rate for fluoroplastics was found to be about 10 times lower than that for nylon.