PET is a kind of polyester plastic, which is used to make fibers, plastic bottles and food packaging materials. PVC is a kind of polyvinyl chloride plastic, which is widely used in building materials, wires and cables, pipes and toys. PET material has good transparency and luster and smooth surface. PVC has poor transparency, which can be divided into transparent, translucent and opaque, and its texture is relatively hard.
PET has good mechanical properties, including high hardness, high strength and good toughness. It also has excellent heat resistance and chemical corrosion resistance. However, PVC has good flexibility and plasticity and is easy to process and shape, but its heat resistance is poor, and it is easy to release harmful substances at high temperature.
PET is considered as a relatively environmentally friendly material because it can be recycled and will not release harmful substances under normal use conditions. When PVC burns, it will release toxic hydrogen chloride gas and pollute the environment, so its use is restricted or prohibited in some countries.
Uses: PET is often used in food and beverage packaging (such as mineral water bottles and juice bottles), textile fibers, insulation materials and other fields. PVC is usually used to make pipes, floors, artificial leather, wires and cables, medical equipment and other products.