First, the product name identification method
Wire--irradiated cross-linked low-smoke halogen-free flame-retardant polyethylene insulated wire and cable; cable--radiation cross-linked low-smoke non-halogen flame-retardant polyethylene insulated low-smoke halogen-free flame-retardant polyethylene sheathed power cable. Imitations will have a slightly different name in general, such as irradiation cross-linked polyethylene insulated low-smoke halogen-free sheathed flame-retardant power cables and so on.
Second, hot water soaking
If the core or cable is immersed in hot water at 90°C, the insulation resistance will not drop rapidly and stay above 0.1MΩ/Km under normal conditions. If the insulation resistance drops sharply or even below 0.009MΩ/Km, it means that it has not been treated with an appropriate irradiation cross-linking process.
Third, the epidermis burning method
The insulation layer should not be significantly sunken by using a soldering iron. If there is a large depression, there is a defect in the material or process used for the insulation layer. Under normal circumstances it should be difficult to ignite, after a long time of burning the insulating layer of the cable is still relatively complete, there is no smoke and pungent odor, while the diameter has increased. If it is easy to ignite, it can be determined that the insulating layer of the cable is not using a low-smoke halogen-free material. If there is a large amount of smoke, it means that the insulating layer uses a halogen-containing material. If the insulation surface is severely detached after a long period of combustion and the diameter does not increase significantly, it means that the proper irradiation cross-linking process has not been performed.
Fourth, the density contrast method
Low-smoke halogen-free materials have a higher density than water and can be stripped of some insulating layers into water. If they float above the water, it is definitely not a low-smoke, halogen-free material.
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