The characteristics and identification method of t

2022-10-23
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Zhujiang cable shares the characteristics and identification methods of low smoke halogen-free wires

with the development of technology, more and more wires and cables with different performance begin to enter people's life. Low smoke halogen-free cable is one of them. Whether it can correctly play its performance depends on whether it can correctly understand this kind of cable. Below, Zhujiang cable, an 18 year old cable expert, will analyze such excellent cables in detail, Learn about the characteristics of low smoke halogen-free wires ~

through technological innovation, Zhujiang cable has continuously improved the performance of low smoke halogen-free cables. The materials of the low smoke halogen-free cables produced do not contain any halogen and other toxic substances. In the case of combustion, there are no wires with a lot of smoke. When a fire occurs, it spreads slowly, with low smoke concentration, high visibility and small release of harmful gases, which is convenient for personnel evacuation. The corrosivity of combustion gas is small, and the damage to instruments and equipment is avoided. The characteristics of low halogen and halogen-free greatly improve the aging resistance and UV and other radiation resistance of cable materials, thereby extending the service life of cables. The following is a summary of its various characteristics:

1. No toxic black smoke will be produced during combustion (a small amount of white smoke will be produced)

2. The characteristics of low smoke halogen-free flame retardant wires -- the tensile strength is greater than that of ordinary PVC wires: the tensile strength of ordinary PVC wires is greater than 1.05kgf/mm2, and the selection of low smoke halogen-free wire anti electronic universal testing machine type must need to test the force value, which is below 2Kn. Generally, single column electronic tensile testing machine is selected If it is greater than 2Kn to 50kn1, the bench top electronic tensile testing machine with double columns is generally used. If it is more than 50kN, the floor type electronic universal material testing machine is used, and the tensile strength is greater than 1.2kgf/mm2

3. Characteristics of low smoke halogen-free wires -- good weather resistance (-30 ℃ ~105 ℃); It has good softness (hardness is)

4. Characteristics of low smoke halogen-free flame-retardant wire -- it has non mobility (because this product formula does not need to add plasticizer, it will not have mobility)

5. High volume resistivity: PVC wire is generally 1012~1015 ω/Cm3, low smoke halogen-free wire greater than 1016 ω/Cm3 and the room should have enough space; (7) Good high voltage resistance

what is the identification method of low smoke halogen-free wire

1. Skin scalding method: scald the insulating layer with an electric iron, and there should be no obvious depression. If there is a large depression, it indicates that the material or process used in the insulating layer has defects. Or barbecue with a lighter. Under normal circumstances, it should not be easy to ignite. After a long time of burning, the insulation layer of the cable is still relatively complete, without strong smoke and the sexual smell of stimulating jc890 ⑵ 001 masonry mortar and plaster mortar for autoclaved aerated concrete. At the same time, the diameter has increased. Even if the low smoke halogen-free wire with flame retardant function burns, it will be extinguished in an instant to prevent the spread of the fire. If it is easy to ignite, it can be determined that the insulation layer of the cable does not use low smoke halogen-free materials (most likely polyethylene or cross-linked polyethylene materials). If there is large smoke, it indicates that the insulating layer is made of halogen containing materials

2. Hot water immersion method: put the wire core or cable in hot water at 90 ℃, and under normal circumstances, the insulation resistance will not drop rapidly and will remain at 0.1M ω/Above km. For example, the insulation resistance drops rapidly or even is lower than 0.009m ω/Km, it indicates that it has not been treated by appropriate irradiation crosslinking process. (polyethylene or cross-linked polyethylene insulation materials are not suitable for this method of identification, and the previous method can be used for identification)

3 for example, in order to overcome the weight gain and environmental pollution caused by the deicing of internal wiring, density comparison method: the density of low smoke halogen-free material is higher than that of water, so you can peel off a little insulating layer and put it into water. If it floats above the water surface, it must not be low smoke halogen-free material

it is good to know that it is necessary to use low-smoke halogen-free cables, but there are still too many fake and inferior cables in the market at present. They are swaggering and swindling under the selling point of low-smoke halogen-free. If they do not know how to distinguish the real low-smoke halogen-free flame-retardant cables and buy substandard products of substandard quality, it will not only bring inconvenience to our use, but also have huge potential safety hazards, so we must know how to correctly distinguish low-smoke halogen-free cables

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