97久久精品无码一区二区欧美人_成年女人毛片免费观看中文_少妇3p欧美一区二区三区_国产内射爽爽大片_国产色情又大又粗又黄的小说_在线视频 欧美 日韩 国产

? It is a general term for polymers containing repeated amide groups on the main chain of the molecule when they are used as fibers. It is called nylon or nylon internationally.

? Good water and wind resistance, high wear resistance, strength, elasticity and colorability.

? High strength and elastic recovery ability

? Hygroscopic

? Thermal Properties