Wire and cable materials in the field of security monitoring can be divided into conductive materials, insulating materials, sheathing materials, shielding materials, filling materials, etc. according to their use parts and functions.
According to the material properties, it can be divided into metals (copper, aluminum, aluminum alloy, steel), plastics (PVC, PE, PP, XLPE / XL-PVC, PU, TPE / PO), rubber, etc. But some of these materials are common to several structural parts.
Especially thermoplastic materials, such as polyvinyl chloride, polyethylene, etc., can be used on insulation or jackets as long as part of the formulation composition is changed.
Hangzhou Zion Communication will introduce the commonly used non-metallic wire and cable raw materials for everyone:
Metal raw materials
Copper: conductivity is second only to silver, thermal conductivity is second only to gold and silver; corrosion resistance, non-magnetic, good plasticity, easy to weld, and wide range of uses. Copper alloy is mainly used to improve the wear resistance, corrosion resistance, and mechanical physical properties of copper.
Silver: The metal has high electrical and thermal conductivity, has good corrosion resistance and oxidation resistance, and is easy to weld; it is mainly used for plating and cladding; it is mainly used for high-temperature resistance and (note: according to the principle of skin effect) Be a high-frequency communication cable conductor.
Aluminum: conductivity is second only to silver, copper, and gold; good thermal conductivity, good corrosion resistance, general mechanical strength, good plasticity, and low specific gravity. The disadvantage is that the tensile strength is low and it is not easy to weld. Aluminum alloy is mainly used to improve the mechanical strength, heat resistance, and weldability of aluminum.
Gold, nickel: used as high-temperature wire.
Iron (steel): often used as a reinforcement material for composite conductors, such as steel core aluminum wire, copper-clad steel, aluminum-clad steel wire, etc.
Zinc: used as a coating for steel wire/steel strip/iron conductor to prevent corrosion.
Tin: used as a coating for steel wire/copper wire to prevent corrosion and facilitate copper wire welding.
Non-metallic raw materials
Polyvinyl chloride (PVC) PVC is generally used as insulation and sheath material. The performance of PVC as wire and cable insulation: non-flammable, aging-resistant, oil-resistant, chemical-resistant, impact-resistant, and easily colored; but due to its large dielectric constant, it is generally used only as an insulation material for low-voltage cables and control cables. The performance of PVC as wire and cable sheath: It has good wear resistance, can resist oil, acid, alkali, bacteria, moisture and sunlight, etc., and has self-extinguishing performance on the effect of flame; PVC sheath The minimum operating temperature is -40 degrees, and the high-temperature resistance can reach 105 degrees.
Polyethylene (PE) The general physical properties of PE: white wax, translucent, flexible and tough, slightly elongated, lighter than water, non-toxic; combustion characteristics: flammable, continue to burn after a fire, the upper end of the flame is yellow and the lower end is blue, Melting dripping during combustion, giving off the smell of paraffin burning; polyethylene processing melting point range is 132 ~ 1350C, ignition temperature is: 3400C, the spontaneous combustion temperature is: 3900C. Polyethylene (PE) Polyethylene has excellent electrical insulation properties and is widely used for the insulation of communication cables; in order to improve the technical-economic indicators of communication cables, foamed polyethylene is generally used. In order to improve the environmental stress cracking resistance, in addition to cross polyethylene, PE with a small melt index can also be selected. Generally, the smaller the molecular weight (the higher the melt index), the worse the environmental stress cracking resistance. Those with a melt index of 0.4 or less can basically avoid environmental stress cracking. Varieties with a density of around 0.950 and a smaller melt index are most resistant to environmental stress cracking. If the density is greater than 0.95, the environmental stress cracking resistance will also be poor, but the lower density and the same melt index are much better. However, when HDPE is molded, internal stress often remains, which should be paid attention to during use.
Polypropylene (PP) The specific gravity of polypropylene is 0.89-0.91, which is the smallest specific gravity among commonly used plastics. It has excellent mechanical strength, the softening temperature is the highest among thermoplastic resins, and has good low-temperature resistance and aging resistance. However, it can be improved by adding stabilizers through copolymerization.
General properties of polypropylene: PP looks very much like HDPE, it is a white waxy solid, transparent than PE, non-toxic, flammable and will continue to burn after being released from the fire, and emit the odor of oil. Compared with polyethylene, polypropylene has the following different characteristics: 1. The surface hardness of PP is higher than that of PE, and the wear resistance and bending deformation ability are very good, so PP is called "low density and high strength plastic". 2. Another advantage of PP over PE is that there is almost no environmental stress cracking phenomenon. PP has extremely excellent resistance to environmental stress cracking. However, due to the high degree of regularity of the molecular structure of PP itself, its impact performance at room temperature and low temperature is very poor. 3. The electrical insulation performance of PP: PP is a non-polar material, so it has good electrical insulation. Its electrical insulation is basically similar to LDPE, and it does not change in a wide frequency range. Due to its extremely low density, the dielectric constant is smaller than LDPE (ε = 2.0 ~ 2.5), the dielectric loss tangent is 0.0005 ~ 0.001, the volume resistivity is above 1014Ω.m, and the breakdown field strength is also very high, 30MV / m; In addition, the water absorption is very small, so PP can be used as a high-frequency insulation material.
Polyester The characteristics of this type of material are high modulus, high tear resistance, high wear resistance, high elasticity, and low hysteresis. The upper limit of the applicable temperature is 1500C, which greatly exceeds that of other thermoplastic rubbers. In addition, it has excellent oil resistance and solvent resistance characteristics. For the detailed explanation of the cable, please refer to the detailed explanation of the main cables involved in the security monitoring cable of HANGZHOU ZION COMMUNICATION CO., LTD
https://www.zion-communication.com/products-zion-communication.html Welcome to pay attention to the cable raw materials involved in the wiring of the security monitoring system supplied by HANGZHOU ZION COMMUNICATION CO., LTD
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