The use of each wire is different, that’s because it has other wires do not have the characteristics, so we still need to understand the characteristics of low-smoke halogen-free flame retardant wire before buying low-smoke halogen-free flame retardant wire.
1. low smoke halogen-free flame retardant wire characteristics – tensile strength higher than ordinary PVC wire: general tensile strength of PVC wire is greater than 1.05Kgf/mm2, while the tensile strength of low smoke halogen-free wire is greater than 1.2Kgf/mm2;
2. Characteristics of low-smoke halogen-free flame retardant wire: good weather resistance (-30℃~105℃), good softness (hardness 80-90);
3. low-smoke halogen-free flame retardant wire characteristics – non-mobility (because there is no need to add plasticizers in the formulation of this product, therefore, there is no mobility); no toxic black smoke when burning (will produce a small amount of white smoke); have a high volume resistivity: wire is generally 1012 ~ 1015Ω/cm3. low-smoke halogen-free wire more than 1016Ω/cm3; (1) good resistance to pressure: PVC Wire is generally resistant to more than 10KV, but low-smoke halogen-free wire up to 15KV or more; (2) has good elasticity and adhesion.
How to identify low-smoke halogen-free flame retardant wire?
1. Identify the method of low-smoke halogen-free flame retardant wire and product name identification method. Wire and cable – low smoke-free halogen-free flame-retardant polyethylene insulated wire and cable – low smoke-free halogen-free flame-retardant polyethylene insulated low smoke-free halogen-free flame-retardant polyethylene sheathed power cables. Generally speaking, the name of the imitation products will be a little different, such as polyethylene insulated low-smoke halogen-free flame-retardant sheathed power cables.
2. Identification of low-smoke halogen-free flame-retardant wire and burning method. Insulation should not appear obvious depression, if there is a large depression, indicating that the insulation layer used in the material or process defects. Or baked with a lighter, generally not easy to light, after a long time after burning the cable insulation layer is still relatively intact, no smoke and irritating odor, while the diameter has also increased. For example, it is easy to ignite, it can be concluded that the cable insulation layer does not use low-smoke halogen-free materials (most likely polyethylene or cross-linked polyethylene materials). If there is a large soot, it means that the insulation layer uses halogen-containing materials. If the long-term combustion, the insulation surface shedding serious, the diameter did not increase significantly, indicating that there is no appropriate irradiation crosslinking process.
3. Identify the method of low-smoke halogen-free flame retardant wire and hot water impregnation method. The core or cable will be placed in 90 ℃ hot water immersion, under normal circumstances, the insulation resistance will not drop rapidly, and remain above 0.1MΩ/Km. If the insulation resistance decreases rapidly, even below 0.009MΩ/Km, it means that the appropriate radiation – crosslinking process is not used to deal with. (This identification method does not apply to polyethylene or cross-linked polyethylene insulation materials, can be used to identify the method described in Article 2 above).
4. Identification of low-smoke halogen-free flame retardant wire density comparison method. Low-smoke halogen-free materials are denser than water, a small amount of insulation can be stripped into the water, if floating above the surface of the water, it is not low-smoke halogen-free materials.
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