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Characteristics and identification method 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 the wire, but for a number of different uses of the wire is still very little, so we want to understand the low smoke halogen-free flame retardant wire first to learn about the characteristics of low smoke halogen-free flame retardant wire and what is the identification method? The specific knowledge answers are as follows:
What are the characteristics of low smoke halogen-free flame retardant wires?
The use of each wire is different, that is because it has no other wire characteristics, so we buy low smoke halogen-free flame retardant wire before or to understand the characteristics of low smoke halogen-free flame retardant wire.
1. Low Smoke halogen-free flame retardant wire features-tensile strength than General PVC wire: General PVC wire tensile strength is greater than 1.05kgf/mm2, while the low smoke halogen-free wire tensile strength is greater than 1.2kgf/mm2;
2. Low smoke halogen-free flame retardant wire features-good weather resistance( -30℃~105℃), with a good degree of softness (hardness of 80-90);
3. Low smoke halogen-free flame retardant wire features-non-removable (because this product formula does not add plastic agent, it does not have a shape-shifting nature), burning without toxic black smoke (which produces a small amount of white smoke), with a high volume resistivity: PVC wire is generally 1012~1015ω/cm3, Low smoke halogen-free wire is greater than 1016ω/cm3, (7) has a good resistance to high pressure characteristics: PVC wire generally resistant to more than 10KV, while low smoke halogen-free wire up to 15KV above, (8) with good elasticity and stickiness.
Low Smoke halogen-free flame retardant wire identification method?
1, low smoke halogen-free flame retardant wire identification method of product name identification method. 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. In general, the name will be a little different, such as polyethylene insulated low smoke halogen-free sheathed flame-retardant power cable and so on.
2, low smoke halogen-free flame retardant wire identification method of the skin burning method. With electric iron hot insulation layer should not be obvious sag, if there is a larger sag, the use of insulating layer of materials or technology defects. Or with a lighter barbecue, under normal circumstances should be not easy to ignite, after a long time after burning the insulation of the cable is still relatively intact, 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 does not use a low smoke halogen free material (most likely polyethylene or cross-linked polyethylene material). If a larger smoke occurs, the insulating layer uses halogen-containing materials. If the insulation surface falls off seriously and the diameter does not increase obviously after a long time burning, the proper irradiation crosslinking process is not carried out.
3, low smoke halogen-free flame retardant wire identification method of hot water immersion method. The wire core or cable is immersed in 90 ℃ hot water, the insulation resistance will not fall rapidly and remain above 0.1mω/km. If the insulation resistance drops rapidly or even below the 0.009mω/km, it is not treated by the appropriate irradiation crosslinking process. (polyethylene or cross-linked polyethylene insulating material is not suitable for this method identification, can be identified by the method of the second article above).
4, low smoke halogen-free flame retardant wire identification method of density comparison method. Low smoke halogen-free material density than water, you can peel a little insulating layer into the water, if floating above the water, it is certainly not low smoke halogen-free materials.