What are the characteristics and identification methods of low-smoke halogen-free flame-retardant wires? We don't know anything about low-smoke halogen-free flame-retardant wires. Many people only know wires, but they still know little about wires for different purposes. , so if we want to understand low-smoke halogen-free flame retardant wires, we must first understand the characteristics and identification methods of low-smoke halogen-free flame retardant wires? The specific knowledge answers are as follows:
What are the characteristics of low smoke halogen free flame retardant wire?
The purpose of each wire is different, because it has the characteristics that other wires do not have, so before we buy low-smoke halogen-free flame-retardant wires, let's take a look at the characteristics of low-smoke halogen-free flame-retardant wires. what.
1. 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 general PVC wires is greater than 1.05Kgf/mm2, while the tensile strength of low-smoke halogen-free wires is greater than 1.2Kgf/ mm2;
2. The characteristics of low-smoke halogen-free flame retardant wire--good weather resistance (-30℃~105℃); good softness (hardness: 80-90);
3. The characteristics of low-smoke halogen-free flame retardant wire--non-migration (because no plasticizer is added to the product formula, so there will be no migration); no toxic black smoke will be generated when burning (will A small amount of white smoke is generated); has a high volume resistivity: PVC wires are generally 1012~1015Ω/cm3, low smoke halogen-free wires are greater than 1016Ω/cm3; (7) It has good high voltage resistance characteristics: PVC wires are generally resistant to 10KV or more, while the low-smoke halogen-free wire is as high as 15KV or more; (8) It has good elasticity and viscosity.
What is the identification method of low smoke halogen free flame retardant wire?
1. The product name identification method of the identification method of the low-smoke halogen-free flame retardant wire. Wire -- LSZH flame retardant polyethylene insulated wire and cable; Cable -- LSZH flame retardant polyethylene insulated LSZH flame retardant polyethylene sheathed power cable. In general, the names of imitation products will be a little different, such as polyethylene insulated low-smoke halogen-free sheathed flame-retardant power cables and so on.
2. The identification method of low-smoke halogen-free flame retardant wire is the skin burning method. There should be no obvious depressions in the insulating layer after ironing it with an electric iron. If there is a large depression, it means that the material or process used for the insulating layer is defective. Or use a lighter to grill. 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, there is no thick smoke and irritating odor, and the diameter has increased. If it is easy to ignite, you can be sure that the insulation layer of the cable does not use a low-smoke halogen-free material (probably polyethylene or cross-linked polyethylene material). If there is a large amount of smoke, it means that the insulating layer is made of halogen-containing material. If the insulating surface peels off seriously and the diameter does not increase significantly after burning for a long time, it means that the appropriate irradiation cross-linking process has not been carried out.
3. The identification method of low-smoke halogen-free flame retardant wire is the hot water immersion method. Soak the core or cable in hot water at 90°C. Under normal circumstances, the insulation resistance will not drop rapidly and remain above 0.1MΩ/Km. If the insulation resistance drops rapidly or even lower than 0.009MΩ/Km, it means that it has not been treated by a suitable irradiation cross-linking process.
4. The density comparison method of the identification method of low-smoke halogen-free flame retardant wire. Low-smoke halogen-free materials are denser than water, and you can peel off a little insulating layer and put them in water. If they float above the water surface, they are definitely not low-smoke halogen-free materials.