Wire and cable insulation material is divided into three types: PVC, polyethylene, cross-linked polyethylene, the difference between the three are:

A. Polyethylene English abbreviation PE, it is ethylene polymer, non-toxic, feels like wax, has excellent low temperature resistance (minimum use temperature up to -70 ~ -100 °C), chemical stability, can withstand most of the acid and alkali Erosion (acids that are not resistant to oxidizing properties), insoluble in common solvents at room temperature, easy to stain due to low water absorption, excellent electrical insulating properties; but polyethylene is very sensitive to environmental stress (chemical and mechanical), heat aging Poor sex. The nature of polyethylene varies from species to species, depending on the molecular structure and density.

1 High-density polyethylene with high strength, suitable for hollow products, such as milk bottles, detergent bottles; can be blow-molded into bottles, drums, cans, tanks, etc., or made by casting tank trucks and tanks, etc. Large container.

2 Applied to tube sheet: Extrusion method can produce polyethylene pipe, high density polyethylene pipe is high in strength, suitable for laying underground; extruded sheet can be used for secondary processing; foam extrusion and foam injection can also be used. High-density polyethylene is made into low-foam plastics, used as a platen and building material; protective sleeves (such as cable jackets).

3 used in fiber: China called the polyethylene, generally low-pressure polyethylene as raw materials, made into synthetic fibers. Polyethylene is mainly used for the production of fishing nets and ropes, or used as a floc after being spun into short fibers. It can also be used in industrial acid and alkali resistant fabrics. Ultra-high-strength polyethylene fibers (strengths up to 3 to 4 GPa) have been developed so that they can be used as a composite material for vests, automobiles, and offshore operations.

4Used in sundries: Miscellaneous goods produced by injection molding include daily sundries, artificial flowers, turnover containers, small containers, parts for bicycles and tractors, etc.; refrigerators, storage containers, household kitchen utensils, sealing covers, etc.; manufacturing of structural parts High-density polyethylene is used.

B. PVC, referred to as PVC, is a polymer of vinyl chloride. It is chemically stable and resistant to acids, alkalis and some chemicals. It is resistant to moisture, aging and flame. When it is used, the temperature cannot exceed 60°C and it will harden at low temperatures.

PVC soft plastics and hard plastics: soft mainly made of film, as packaging materials, rain supplies, agricultural film, etc., can also be used for insulation of cables, wires, artificial leather products; hard general Pipes and plates are made, which are used as water pipes and pipes for conveying corrosion-resistant fluids. The plates are used as linings and floors for various tanks. Such as: 0.6/1kv PVC insulated power cable; can also be used as plastic door panels, desks, cabinet doors, etc. can apply PVC film on the sheet; widely used in a variety of imitation leather products, such as luggage, sports products, Basketball, football, etc. %q@ qCV

C. The cross-linked polyethylene abbreviation XLPE is an important technology for improving the performance of PE. Cross-linked modified PE can greatly improve its performance, not only significantly improve the mechanical properties of PE, resistance to environmental stress cracking resistance, chemical corrosion resistance, creep resistance and electrical properties and other comprehensive performance, and The temperature rating of the PE is obviously improved, and the heat-resistant temperature of the PE can be increased from 70°C to 90°C, which greatly broadens the application range of the PE. At present, cross-linked polyethylene (XLPE) has been widely used in pipes, films, cable materials and foam products. Such as: 35kv and below cross-linked polyethylene insulated power cable.

Crosslinked polyethylene compared with uncrosslinked polyethylene: Vicat softening point increased from 87°C to 94°C; after heat aging at 120°C for 168 hours, the tensile strength preservation rate was 98%, and elongation retention rate was 81%. Uncross-linked polyethylene has melted and cannot be examined; only 20% of samples of cross-linked polyethylene broke in the active environment for 1000 hours, whereas uncross-linked polyethylene samples broke in only 4 hours; dielectric strength increased by 39 KV/mm To 41KV/mm; oxygen index increased from 17.5% to 28% (gel content ≥ 65%); pipe burst pressure increased significantly, at room temperature, higher than 4Mpa, up to 2Mpa at 95°C.