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The difference between PET material and PC material?

2021-01-03

1. From a conceptual point of view:
PC (polycarbonate): It is a colorless, transparent, bright and beautiful Plastic. Because PC is non-toxic and odorless, it has good ultraviolet penetration resistance, moisture-proof and fragrance-preserving performance, wide temperature resistance, no brittleness at -180°C, and long-term use at 130°C, so it is an ideal food Packaging Materials.
PET: A material with good crystallinity, colorless and transparent, and extremely tough. It has the appearance of glass, is odorless, tasteless, non-toxic, flammable, has a yellow flame with a blue edge when burning, and has good air tightness.
2. From the perspective of characteristics and usefulness:
PC: It has the characteristics of good impact resistance and easy forming. It can be manufactured into bottles, cans and various forms of containers for packaging beverages, alcohol, milk and other fluid substances. The biggest disadvantage of PC is stress cracking. In addition to the selection of high-purity raw materials and strict control of various processing conditions in the production, the modification of resins with low internal stress, such as a small amount of polyolefin, nylon, polyester, etc. melt blending, can significantly improve stress crack resistance and water resistance .
PET: Small expansion coefficient, low molding shrinkage, only 0.2%, which is one-tenth of polyolefin, smaller than PVC and nylon, so the product has a stable size. The mechanical strength is the best, its expansion degree is similar to aluminum, the film strength is 9 times that of polyethylene, 3 times that of polycarbonate and nylon, and the impact strength is 3 to 5 times that of ordinary films. The film has moisture-proof and fragrance-preserving properties. Although polyester has the above advantages, its film is more expensive, difficult to heat seal, and easy to charge static electricity, so it is rarely used alone. Most of them are coated with a resin with good heat sealability to make a composite film.

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