Torlon

A high-performance, amorphous, non-crystalline engineering thermoplastic. Chemically, Torlon is a polyamide-imide, a reaction product of trimellitic anhydride and aromatic diamines. Torlon polyamide-imide is virtually unaffected by aliphatic and aromatic hydrocarbons, chlorinated and fluorinated hydrocarbons, and most acids at moderate temperatures. It may be attacked by saturated steam, strong bases, and some high-temperature acids. It is stronger at 400°F (204.4°C) than other engineering resins at room temperature. Torlon is also tougher and more impact-resistant at cryogenic temperatures than other high-strength polymers.

See also Thermoplastic Labyrinth Seal.