PI (Polyimide) is an extreme performance plastic branded by DuPont Co. as VESPEL. Typical attributes include low wear and friction at high PV, outstanding resistance to creep, superior strength and impact resistance.
VESPEL components allow for continuous operation temperatures of 500°F (260°C) with short-term excursion capabilities of 900°F (482°C).
VESPEL is available in many grades to meet specific design requirements. The current available grades include SP-1 (Unfilled), SP-21 (15% Graphite), SP-22 (40% Graphite), SP-211 (15% Graphite and 10% PTFE) and SP-3 (15% Molybdenum Disulfide).