materials
Unfilled polyimide
Unfilled polyimide is chosen when electrical insulation, thermal performance, and machinability share one part. It is typically amber or brown and is the common analog to unfilled grades such as Vespel® SP-1.
Typical advantages
Electrical insulation, high-temperature performance, low friction, wear resistance, light weight, chemical resistance, dimensional stability, and excellent machinability.
Dominion equivalent grades
Dominion offers unfilled polyimide equivalent or alternative grades corresponding to commonly specified Vespel® SP-1, SCP-5000, and SMP-40025 materials. DuPont identifies SP-1 as an unfilled polymer; SCP-5000 is the unfilled grade of the SCP high-temperature family; SMP-40025 is a specialty direct-formed polyimide with high modulus and thermal oxidative resistance.
Questions engineers ask
Short answers
Does unfilled polyimide absorb moisture?
It has low moisture sensitivity compared with many conventional polymers. Still send the environment if the part sees steam, fuel, or hydraulic fluid.
