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cotton is a natural fiber, its main composition is cellulose, and a small amount of waxy substance and nitrogen content and pectic substances, cotton casual wear t-shirts long no harm to human body, h hygroscopicity: cotton fiber has good hygroscopicity. under normal circumstances, the fiber can absorb water into the surrounding atmosphere, so it touches the skin and makes people feel soft but not because cotton fiber itself has the advantages of porosity, high elasticity, a large amount of air can be stored between the fibers, and the air is a poor conductor of heat and electricity, so pure co pure cotton fabric good heat resistance, at room temperature, wearing use, washing printing and dyeing have no effect on the fabric, thus improving the washable wear resistance of pure cotton fabric. alkali resistance: cotton fiber has great resistance to alkali, cotton fiber in alkali solution, fiber does not damage phenomenon, this performance is conducive to the pollution after washing, disinfe.syi