Nylon boasts the highest tensile strength among all fibers. Its abrasion resistance is 10 times that of cotton fiber and 50 times that of viscose fiber, ranking first among various fibers. Hence, it is an ideal material for manufacturing automobile tires when bonded with rubber. Nylon features good resistance to strong alkali and weak acid. Its strength loss is negligible after being treated with 10% NaOH solution at 95℃ for 16 hours. However, it has poor light resistance, prone to discoloration and embrittlement, so nylon fabrics shall not be exposed to direct sunlight for a long time. Nylon 66 is prohibited from being used in pharmaceutical and food factories, as it contains toxic ingredients which are harmful to human health.