Chemical grade polyvinyl alcohol is harmful. Inhalation and ingestion are harmful to the body and irritating to the eyes. Pharmaceutical grade polyvinyl alcohol, different from chemical grade polyvinyl alcohol, is an extremely safe macromolecular organic matter, non-toxic to human body, no side effects, and has good biocompatibility, especially in medical treatment, such as water-based gels, which are widely used in ophthalmology, wound dressings, and artificial joints. At the same time, polyvinyl alcohol films are used in pharmaceutical films, Artificial kidney membrane is also used
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