What are the characteristics and identification methods of cable low smoke halogen-free flame retardant wire? For low smoke halogen-free flame retardant wire we do not know at all, many people only know the wire, but for some different uses of the wire to understand or very little, so we want to know low smoke halogen-free flame retardant wire is to understand the characteristics of low smoke halogen-free flame retardant wire and what is the identification method? Specific knowledge solutions are as follows:
Cable low smoke halogen free wire
What are the characteristics of low smoke halogen-free flame retardant wire?
Each kind of wire is different, because it has no other characteristics of the wire, so we in the purchase of low smoke halogen-free flame retardant wire before or to understand the characteristics of low smoke halogen-free flame retardant wire is what.
1. The characteristics of low smoke halogen-free flame retardant wire - tensile strength is greater than general PVC wire: general PVC wire tensile strength is greater than 1.05Kgf/mm2, and low smoke halogen-free wire tensile strength is greater than 1.2Kgf/mm2;
2. Characteristics of low smoke halogen-free flame retardant wire -- with good weather resistance (-30℃~105℃); Has a good degree of softness (hardness of 80-90);
3. Characteristics of low smoke halogen-free flame retardant wire -- non-shifting (because this product formula does not add plasticizer, so there will not be shape shifting); It will not produce toxic black smoke (a small amount of white smoke) when burning; With high volume resistivity: PVC wire is generally 1012~1015 ω /cm3, low smoke halogen-free wire is greater than 1016 ω /cm3; (7) with good high voltage resistance: PVC wires generally resistant to more than 10KV, and low smoke halogen-free wires up to more than 15KV; (8) It has good elasticity and viscosity.
What is the identification method of cable low smoke halogen-free flame retardant wire?
1, low smoke halogen-free flame retardant wire identification method product name identification method. Wire - low smoke halogen-free flame retardant polyethylene insulated wire and cable; Low smoke halogen free flame retardant POLYETHYLENE insulated low smoke halogen free flame retardant polyethylene sheathed power cable. Imitation products generally have a little different name, such as polyethylene insulation, low smoke halogen-free sheath flame retardant power cable and so on.
2, low smoke halogen-free flame retardant wire identification method of skin burning method. If the insulation layer is ironed with an electric iron, there should be no obvious depression. If there is a large depression, it indicates that there is a defect in the material or process used in the insulation layer. Or barbecue with a lighter, under normal circumstances should be not easy to ignite, after a long time of combustion, the insulation layer of the cable is still relatively complete, no smoke and irritating smell, and the diameter has increased. If it is easy to ignite, it can be determined that the insulation layer of the cable is not made of a low smoke halogen free material (most likely polyethylene or crosslinked polyethylene). If there is a large smoke, it means that the insulation layer is used halogen material. If the insulation surface falls off seriously and the diameter does not increase significantly after a long time of combustion, it indicates that the appropriate irradiation crosslinking process has not been carried out.
3, low smoke halogen-free flame retardant wire identification method of hot water immersion method. Soak the wire core or cable in hot water at 90 ° C. Under normal circumstances, the insulation resistance will not drop rapidly and keep above 0.1m ω /Km. If the insulation resistance drops rapidly or even below 0.009M ω /Km, it indicates that the proper irradiation crosslinking process has not been processed. (Polyethylene or crosslinked polyethylene insulation materials are not suitable for this method of identification, can be identified by the method of article 2 above).
4, low smoke halogen-free flame retardant wire identification method density contrast method. The density of low-smoke halogen-free material is larger than that of water, so you can peel off a little insulation layer and put it into water. If it floats above the water, it is definitely not low-smoke halogen-free material.
