It is composed of carbon, hydrogen, oxygen three elements, its mass ratio: carbon 44.4%, hydrogen 6.17%, oxygen 49.39%, its density is generally l50-l56g / cm, specific heat capacity l3o-l40kj / (kg · ℃), soluble in copper ammonia solution, has a good hydrophilic and good adsorption.General type of refined cotton: (c6h1005) n.n indicates the polymerization of cellulose, indicating the repeated basic chain- -glucose residues in the constituent cellulose macromolecules, the number of glucose residues contained in the cellulose macromolecules is called the polymerization of cotton fiber is generally 10000-15000.