How much do you know about PVC for wire and cable sheath?

PVC plastic is not only used in wire and cable insulation, but also widely used in sheaths. Used as a sheath, PVC plastic requires good corrosion resistance, sufficient mechanical properties, softness, easy processing and laying. The main sheathed PVC plastics are as follows:

1. Model H-70, long-term working temperature 70 °C or 80 °C, to achieve a certain mechanical strength, while having good heat resistance, photoaging and cold resistance, of which long-term working temperature of 70 °C sheathed polyvinyl chloride is mainly used in 450/750V and below wire and cable, 80 °C is used for 26/35kV and below power cable sheath.
2. Model HR-70, long-term working temperature 70 °C or 80 °C, good flexibility and cold resistance, used for 450/750V and below flexible wire and cable. 
3. Model H I-90, long-term working temperature 90 °C, good heat resistance, mechanical strength is sufficient, used for 26/35kV and below power cables. 
4. Model H II-90, long-term working temperature 90 °C, good heat resistance, sufficient mechanical strength, used for 450/750kV and below wire and cable.