. A series of polyimides can be processed by direct forming, a molding method similar to that used in powdered metallurgy. The Meldin 7000­series polyimides are formed using high-pressure mold presses, automatic resin-feeding systems, and computer-controlled hydraulics. Complex shapes can be molded, reducing the need for secondary machining operations. The Meldin 7000­series features operational temperatures of 600ºF for continuous operation and 900ºF for intermittent exposure, and tight tolerances of ±0.001 in. on both ODs and IDs. Manufactured by Saint-Gobain Performance Plastics (Bristol, RI; 401/253-2000), the polyimides are available in two grades: unfilled 7001 and 15% graphite-filled 7021. The 7001 grade is suitable for high-temperature structural, high-purity semiconductor, and welding component applications, while the 7021 grade is efficient in stable, low-weight bearing and guideway applications.