Polyvinyl chloride (PVC): the density of ρ = 1.4 or so, with the flame burning black smoke, remove the flame automatically extinguished. According to its performance can be divided into ordinary PVC, UL requirements of PVC, and SR-PVC. Ordinary PVC tensile strength, elongation performance are poor, the temperature level is relatively low, do not burn. UL in line with the general requirements of the PVC tensile strength, elongation performance is better, and noted in its use can be divided into a variety of different materials of PVC, not easy to burn.

SR-PVC: SR-PVC is semi-hard PVC, resistant to burning, high strength, temperature and voltage performance better than PVC, not easy to burn, burning acid pungent nose and water sink.

Polypropylene (PP): the density of ρ = 0.9 or so, commonly used in low-voltage cables. Its good tensile strength, excellent elongation, light weight, easy to burn, burning side of the edge of burning fuel oil burning smell.

Polyethylene (PE): the density of 0.91-1.26 between. Easy to burn, burning side of the burning side of the smell of paraffin burning. Commonly used in signal cables. Commonly used PE has LD-PE, HD-PE and FM-PE.

Low-density PE (LD-PE): density of ρ = 0.91-0.92, light weight, easy to burn.

High-density PE (HD-PE): density of 0.94-0.95, light weight, easy to burn. Relative to the LD-PE hard.

Foaming PE (FM-PE): material is soft, easy to burn. Under the microscope to see the pores, the insulation performance is poor.