Different types of plastic raw materials have their own advantages. In the PVC family, type five and type eight are widely used, each with its unique advantages. The average degree of polymerization of PVC type five is about 1000, and it has a slightly higher melting temperature during processing, at 160 - 180℃, with poor fluidity. However, it has excellent physical properties, good tensile strength and impact toughness, and high hardness.
Because of this, it is widely used in the construction field and is often made into building pipes, which can withstand pressure and environmental corrosion; it is also used to make doors and windows, which are strong and durable and can withstand the wind and sun for a long time. The average degree of polymerization of PVC type 8 is about 800, the melting temperature is 150 - 170℃, and it has good fluidity, making processing easier. However, the strength and hardness are slightly lower than those of type 5.
This characteristic makes it highly favored in the wire and cable industry, where it can efficiently coat conductors as insulation and sheathing; it is also commonly seen in the packaging field, where it is made into soft films and packaging bags with excellent flexibility, which closely adhere to items and can be used for food packaging to keep it fresh and display it. In short, the five and eight types of PVC play a key role in different industries due to their performance differences, providing strong support for the development of various fields.
