Thermosetting Polyimides (PI) are available as stock shapes, thin sheets, laminates & machined parts. Polyimides are known for thermal stability, good chemical resistance & excellent mechanical properties. They exhibit very low creep & high tensile strength. These properties are maintained during continuous use to temperatures of 450°F (232°C) and for short excursions, as high as 900°F (482°C). Molded polyimide parts & laminates have very good heat resistance. Normal operating temperatures for such parts and laminates range from cryogenic to those exceeding 500°F (260°C). Polyimides are also inherently resistant to flame combustion and do not usually need to be mixed with flame retardants. Most carry a UL rating of V-0. Typical polyimide parts are not affected by commonly used solvents & oils including hydrocarbons, esters, ethers, alcohols and freons. They also resist weak acids but are not recommended for use in environments that contain alkalis or inorganic acids.
Professional Plastics stocks the largest inventory and widest variety of polyimide shapes in the world (USA, Singapore & Taiwan stock). Stock materials include: Meldin®, Vespel®, Kapton® Film and Kaptrex® Film.
Vespel SP-1 vs Meldin 7001 Comparative Data Sheet