1, polyvinyl chloride (PVC)

Polyvinyl chloride is a very common plastic (referred to as PVC), which is a multi-component mixed material based on polyvinyl chloride resin and joined with various compounding agents. Its mechanical properties are superior (general tensile strength ≥12.5MPa, elongation at break ≥ 150%), chemical corrosion resistance, non-delayed combustion, good weather resistance, and one thing is cheap.

The normal temperature grade of this material is -15℃ ~ 70℃, but because it is good enough and cheap enough, some manufacturers add rubber substances in it to improve its softness and temperature resistance, and now there are improved high temperature resistant polyvinyl chloride, temperature grade can reach -40℃ ~ 105℃.

PVC itself has a certain flame retardant effect, after burning black smoke and accompanied by pungent acid odor, burning ash is black burnt crust. For some "ZR-" beginning of the flame retardant cable, you need to choose the model with flame retardants, the general oxygen index to reach more than 28.

2, polyethylene (PE) and its copolymer

Polyethylene (PE), polypropylene (PP), polyolefin (PO) such materials are composed of hydrocarbon elements, without the addition of flame retardants in the original state, are not flame retardant.

Among them, the polyethylene appearance is milky white, translucent when thin, opaque when thick, waxy surface, burning part of the blue flame, easy to drop, emit the taste of candle burning. Good insulation performance, in low temperature environment (-70℃), no brittle, no hardening. Good chemical stability, water resistance, excellent aging resistance, there is a small density (about 0.95g/cm ³), light weight of the finished product, tensile strength can reach more than 20MPa, elongation at break can reach more than 400%.

However, its working temperature is not high, because its melting point temperature is 110 ° C ~ 135 ° C, the working temperature is about 70 ° C, and irradiation crosslinked polyethylene is only 90 ° C.

In view of its high insulation, it is widely used in GB/T 12706 YJ series power cables as insulation. At the same time, its dielectric constant is stable, the dielectric loss Angle is small, and it is also used as the insulating medium of network cable and coaxial line. Polypropylene (PP) is similar to polyethylene, conventional products are not used much, because of its high temperature grade can reach more than 100 ° C, in some places with temperature requirements, it will be used instead of polyethylene.

3. Polyolefin is a very complex category, different olefin ratio leads to its different functions, its appearance is opaque, the natural color is also a kind of milky or milky white, most of the types of surface is not smooth, friction is large, if it is used in the multi-core cable when insulation, the finished product is hard, must choose the surface material hard, smooth surface of the brand.

Usually, polyolefin only has a working temperature of 90 ° C, in order to improve its temperature resistance level, cross-linked materials will be selected to increase the temperature, and the current common three grades are 105 ° C, 125 ° C and 150 ° C.

As a halogen-free material, polyolefin is widely used in ships, railways, new energy vehicles and other fields, especially the low-smoke halogen-free flame retardant formula, which has an irreplaceable role in these fields.


Qingdao Tianxing cable low smoke halogen-free wire using silane self-crosslinked low smoke halogen-free flame retardant polyolefin cable material, to avoid customers using automatic wire cutting machine lead to wire cutting, insulation shrinkage copper leakage phenomenon.

Qingdao Tianxing Cable Co., Ltd. focuses on the production of customized wire and cable manufacturers, main: fire wire and cable, power cable, control cable, home improvement wire and other products, exported to more than 40 countries and regions around the world, the annual production capacity of 1 billion yuan. 6000 square meters of storage, standing hundreds of millions of inventory, order demand for rapid distribution and delivery, large prices more favorable.