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Main Futures? The product is composed of 75 per cent of polyvinyl alcohol (PVA / PVA) and remaining 25 per cent of compound plasticizers and organic additive. The water-soluble film is green environmental Product. It is verified by microorganism tests that PVA is non-toxic and doesn't restrain from the growth of microorganism and can be degraded totally. It has no any bad effect on environment. Once PVA is dissolved in water, specific microorganism will cause it to degrade. When treated with activated sludge, solutions of PVA will be decomposed into water and carbon dioxide. Water-soluble PVA film has an excellent gas barrier to oxygen, nitrogen, hydrogen, helium, argon, carbonic acid gas and so on when the humidity is low, but it permit moisture and NH 3 to penetrate . Moreover, it has an excellent fragrance preservation of the contents and can keep products moisture and fresh as well. Because water-soluble film has a lot of hydroxyl groups in molecule, it does not take charges. It is different from the film that is made from the other synthetic resins and it has the same antistatic properties as cellophane. If PVA film is used for product packing, it could keep products out of dust. The water-soluble PVA film has the good characteristic to resist the oils and fats such as animal oils, vegetable oils, mineral oils, fats, organic solvents and the hydrocarbons to penetrate. However, it can be affected by strong acid, strong base, chlorine free radical and some special chemical which can react with PVA such as borax, boracic acid and coloring matter and so on, so it isn't fit for packing the above things.
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