Ответ:Vydyne® 21SPF is a general purpose Nylon 66 resin available in natural color and black. It is designed principally for injection molding fabrication. This grade offers a well-balanced combination of engineering properties characterized by high strength; rigidity; good toughness; high melt point; good surface lubricity; abrasion resistance; and resistance to many chemicals, solvents, gasoline, and machine and motor oils.