Pharmaceutical grade polyvinyl alcohol, different from chemical grade polyvinyl alcohol, it is a very safe polymer organic substance, non-toxic to the human body, no side effects, and has good biocompatibility, especially in medical treatment such as its water-based gel It is widely used in ophthalmology, wound dressings and artificial joints. At the same time, polyvinyl alcohol film is also used in medicinal membranes and artificial kidney membranes. Its safety can be seen from its use in wound skin repair and eye drops. Some of these models are also often used in facial masks, cleansing creams, lotions and lotions in cosmetics. They are a commonly used safe film-forming agent.