Nylon fiber has high strength, with a strength of 4-5.3 CNdtex and an elongation rate of 18% -45% At 10% elongation, the elastic recovery rate is above 90% Nylon has the strongest strength among fibers. According to measurements, the wear resistance of nylon fiber is 10 times that of cotton fiber and 50 times that of viscose. Its wear resistance ranks first among all fibers, so it is an ideal material for making car tires when pressed together with rubber Nylon fiber is resistant to strong alkali and weak acid. After being treated with NaOH (10%) at 95 ℃ for 16 hours, the strength loss can be ignored. However, nylon is not light resistant and is prone to discoloration and brittleness. Therefore, nylon fabric should not be exposed to sunlight for a long time But nylon 66 cannot be used by pharmaceutical and food manufacturers because it is toxic and harmful to human health