Cement additive has the nature of alkali, acidity and high concentration. It is generally used outdoors, easily touch the operators' eyes and skin and pollute the environment. In the past years, operators had to pull on appropriative overall so as to avoid the pollution of cement additive that brought great discommodity to operating.

 Recently western developed countries have widely used water-soluble films as packaging of cement additive to avoid pollution, and using the films, operation becomes simple and measure becomes exact. Using PVA film for packing,It can measure exactly, avoid unsuitable dosage of cement additive.It could be used without open the packing bag, prevent operators from contacting additive directly.It is safer and more convenient. The films have widely used not only in industry, chemical products and packing of civil merchandise, for example, agrochemicals, chemical fertilizers, dyestuffs, detergents, water-sewer additives, mineral additives, concrete additives, chemicals for photography and gardening etc.