1. The product name identification method for the identification method of low-smoke halogen-free flame-retardant wires. Wire--Low-smoke halogen-free flame-retardant polyethylene insulated wire and cable; cable--low-smoke halogen-free flame-retardant polyethylene insulated low-smoke halogen-free flame-retardant polyethylene sheathed power cable. Imitations generally have a different name, such as polyethylene insulated low-smoke halogen-free sheathed flame-retardant power cables.
2. The method of identifying the low-smoke halogen-free flame-retardant wire by the method of skin burning. There should be no obvious depressions in the insulation layer with an electric iron. If there is a large depression, the material or process used in the insulation layer is defective. Or use a lighter to grill, under normal circumstances should be not easy to ignite, the insulation of the cable is still relatively complete after a long time of burning, no smoke and irritating odor, while the diameter has increased. If it is easy to ignite, it can be determined that the insulation of the cable is not using a low-smoke, halogen-free material (most likely polyethylene or cross-linked polyethylene). If large smoke is present, the insulation is a halogen-containing material. If the insulating surface is severely detached after a long period of burning and the diameter is not significantly increased, it indicates that the appropriate irradiation crosslinking process has not been performed.
3. Hot water immersion method for identifying low-smoke halogen-free flame-retardant wires. The core or cable is immersed in hot water at 90 ° C. Under normal conditions, the insulation resistance does not drop rapidly and remains above 0.1 MΩ/Km. If the insulation resistance drops rapidly or even lower than 0.009 MΩ/Km, it indicates that it has not been treated by a suitable irradiation crosslinking process. (Polyethylene or XLPE insulation materials are not suitable for this method and can be identified by the method described in the second paragraph above).
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