Torlon also referred as polyamide imide is a high performance non crystalline (amorphous) engineering thermoplastic. Polyamide imide (PAI) is a product of aromatic diamines and trimellitic anhydride. Since the polymer chain contains alternative amide linkages with imide linkages, it is also called amide-imide. The outstanding thermal stability of the polymer is due to the combination of imide linkages and aromatic groups. The amide group is responsible for imparting elongation and flexibility. This leads in formation of the engineering plastic having excellent toughness. Common torlon properties include its finer resistance to different range of temperatures. Torlon is a melt processable plastic with high performance. It can perform at continuous temperatures up to 260° C and tough stress conditions. Parts formed from torlon have higher impact resistance and more compressive strength than various other advanced engineering plastics.

High creep resistance and low linear thermal expansion coefficient results in its outstanding dimensional stability under severe conditions. Various torlon grades are: torlon 4203, torlon 4301, torlon 5530. torlon 4203 is an electrical grade with exceptional compressive strength and highest elongation. Torlon 4301 is a bearing grade which provides low friction coefficient and low rate of expansion. Torlon 5530 is a glass reinforced grade which is ideal for electronic applications and higher load structure.