It can be said that plastic bags are closely related to our lives. In the plastic industry, there are many kinds of them. The common ones are PE, PO, PP, and PVC. So what are the differences between these common plastic bags, and which industries are they suitable for? How to accurately identify? Let's analyze it in detail next.

PE: From the appearance, it can be divided into two types: transparent and opaque; in terms of density, it can be divided into two types: high and low density. Among them, low-density PE plastic bags are soft and tough, and high-density plastic bags are relatively durable. Most of them are light in weight, chemically stable, and will not rust; good impact resistance; good insulation, but poor heat resistance, high thermal expansion rate, easy to burn; poor dimensional stability, easy to deform; easy to age.

PP: Compared with PE plastic bags, PP plastic bags have better physical properties. It has excellent characteristics such as corrosion resistance and high temperature resistance. Our common plastic packaging bags and food packaging bags are all made of PP. The biggest feature of this plastic bag is its toughness.

PO: Blow molded from high-density polyethylene, feels like wax to the touch, has excellent low temperature resistance, relatively stable chemical properties, can withstand most acid and alkali erosion, insoluble in common solvents at room temperature, low water absorption, Excellent electrical insulation. But its disadvantage is that the bag body is relatively fragile, the transparency is not high enough, and the pulling force of the whole bag is not very good.

PVC: This material is polyvinyl chloride, and the added ingredients enhance its heat resistance, toughness and ductility. The top layer of the surface film of this bag is paint, the middle is polyvinyl chloride, and the bottom layer is back-coated adhesive. Because of its excellent properties, it is popular among people and is the most widely used synthetic material.