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The barrier properties of fluoropolymers exposed to ethanol-containing fuel blends were investigated using the permeation cup, weight loss method. More specifically, permeation constant data for Fuel C, CE10, CE15, CE22, CE50, CE85 and ethanol through fluoropolymers; THV, PVDF and FEP were measured at 20, 40 and 60°C. Additional techniques such as the measurement of vapor pressure of fuel-ethanol blends using a permeation cup equipped with a pressure transducer are discussed. Vapor pressures for fuel blends were also derived using equations of state such as UNIQUAC, NRTL and Peng-Robinson models. The weight changes and volume changes of fluoropolymers in ethanol-containing fuels were measured. Finally, the crystallinity index and glass transition temperature of fluoropolymers were also measured.

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.