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Micro-SHED (Sealed Housing Emissions Determination) test results of various fuel hoses are compared to the theoretical model predictions of the hose hydrocarbon emissions. Theoretical prediction of the hydrocarbon emission for a defined hose construction is derived from the permeation constants of the materials used in these constructions. Total evaporative emission ET for a fuel hose is considered to originate from three sources: (1) emission through the wall Ew, (2) emission through the ends EE and (3) emission from leaks EL so that Results of this investigation show that, for a specific hose construction, reasonable predictions of hose micro-SHED test results can be made.

THV fluorothermoplastics offer a unique combination of properties, which makes them ideally suited for automotive fuel systems. These properties include low temperature processing, low flex modulus, ease of bonding and excellent permeation resistance to various fuels. Examples of various applications of these fluoropolymers are highlighted and shown in fuel management constructions in combination with both elastomers as well as plastics.