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Mold Set G1 G2 G3 G4 Abrasive Type Grit Loose 1 μm Permanent 600 Permanent 320 Permanent 60 Table 3 - Types of abrasive and Grit of abrasive used for ground molds Molding Process Application of Heat The first attempt to use heat, to aid in softening the Nafion to making it easier to form, was to submerge the Nafion in water heated to 70°C for two minutes. After a molding attempt was made, the Nafion could not be discriminated visually or by measurement from the unmodified Nafion. A second attempt was made heat the Nafion to modify it using the same process but with 100°C water which yielded the same result. For the third method instead of attempting to heat the Nafion membrane by submerging it in heated water, the molds were heated using an oven. The molds were brought to 250°F or 121.1°C. The molds were taken immediately out of the oven and pressure was applied to the mold. This technique modified the surface texture of the Nafion and was employed for Nafion modification. Application of Pressure It was necessary to find out how much pressure to use. The first attempt was to use a clean plate glass surface on the bottom, place the Nafion membrane on the glass surface, then a mold on top of the Nafion membrane. The force used was generated by a drinking glass filled with water. This left no measureable impression on the Nafion. In the next attempt the same set up was used except the amount of force was increased by using a pair of small Irwin hand clamps. This generated enough force to visually modify the 13PDF Image | surface roughness of the Nafion membrane in a PEM fuel cell
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