Answer: blister packing of the material that yingpian or film, commonly used are: PET (polyethylene terephthalate ester two) yingpian, PVC (polyvinyl chloride) film, PS (polystyrene) yingpian. PS yingpian density low, poor toughness, easy combustion, combustion will produce styrene gas (a toxic gas), so commonly used to produce all kinds of plastic tray for industrial use. PVC yingpian toughness moderate, easy combustion, combustion will produce chlorine, some impact on the environment, PVC is easy to heat, can use sealing machine and high frequency machine edge, is the main raw material for the production of transparent plastic products. PET yingpian toughness, high transparency, easy combustion, no harmful gas when burning, which belongs to the environmental protection material, but the price is high, suitable for high-grade plastic products, European countries generally require the use of PET plastic blister film, but it is not easy to heat, bring great difficulties to the package, in order to solve this problem, people using a PETG glycol modified polyethylene terephthalate material, this material is easy to heat PVC, PET also has high environmental protection and transparency, but the price is higher.