<unk>  is a thermoplastic silky material, first used commercially in a<unk> -bristled toothbrush (1938), followed more famously by women's<unk> s” stockings (1940). It is made of repeating units linked by peptide bonds (another name for amide bonds) and is frequently referred to as polyamide (PA).<unk>  was the first commercially successful polymer and the first synthetic fiber to be made entirely from coal, water and air. These are formed into monomers of intermediate molecular weight, which are then reacted to form long polymer chains. It was intended to be a synthetic replacement for silk and substituted for it in parachutes and also making things like ropes, flak vests, vehicle tires, combat uniforms and many other military uses after the United States entered World War II in 1941, making stockings hard to find until the war's end.<unk>  fibers are now used in fabrics, bridal veils, carpets, guitar strings and ropes, and solid<unk>  is used for mechanical parts, drumstick tips and as an engineering material. Engineering grade<unk>  is processed by extrusion, casting & injection molding. Type 6/6<unk>  101 is the most common commercial grade of<unk> , and<unk>  6 is the most common commercial grade of cast<unk> .
Nylon
Wart
Cypress
Fly
Maple
Sultiame
Choana
Flea