• PI-N (comparable to Vespel SP-1) PI-N is the unfilled base resin grade. It provides maximum physical strength, elongation, and toughness as well as the best electrical and thermal insulation values. Typical applications include spacers, high-temp fixtures, valve seats, balls, gaskets, insulators, and seals.
• PI-G15 (comparable to Vespel SP-21)
PI-G15 has 15% graphite by weight added to the base resin for increased wear resistance and reduced friction in applications such as bearings, thrust washers, bushings, seal rings, slide blocks, and other wear applications. G15 has the highest mechanical properties of the graphite-filled grades.