ULTEM® 1000 Calendered Sheet

These thin gauges are calendered: the polyetherimide is drawn between heated precision rollers into flat stock of even thickness with a smooth surface both sides, rather than extruded thick and machined down. That keeps flatness and gauge consistency good enough for stacked and sealing assemblies, and avoids the internal stress a machined thin section carries. Stock runs .040" to 1/8" in five gauges, in sizes from 12"x12" to 24"x48". Thicker sections are supplied as extruded ULTEM® 1000 plate.

Thin amber PEI sheet is punched and die-cut into insulating washers and barriers, electrical standoffs, spacers, shims, gaskets, seal backups, test-fixture and burn-in-board components, and sterilisable medical and laboratory parts. It is the usual choice where a part needs high dielectric strength and inherent flame retardance together with dimensional stability at temperature - it holds properties well above where acetal and nylon fail, and tolerates repeated autoclaving. Keep it away from chlorinated solvents and strong bases, which will craze and attack it.