Low-smoke halogen-free cables and wires when lit low-smoke halogen-free cables and wires are generally used in places with high safety factors, such as airports, trains, ships and other areas with poor natural ventilation, low-smoke halogen-free cables and wires can have safety and stable effects.
Low smoke halogen-free flame retardant cable identification method outside skin burning method. There should be no significant dent in the cable sheath, if there is a relatively large dent, it indicates that the raw material or processing technology of the cable sheath application has shortcomings. Or with a skewer, under normal circumstances should not be easy to ignite, after long-term ignition of the cable sheath is still more detailed, there is no smoke and irritating smell, at the same time, the diameter has increased. If it is very easy to ignite, it can be clear that the cable jacket of the cable line does not use low-smoke halogen-free raw materials (most likely high-voltage polyethylene or high-density polyethylene raw materials). If a relatively large smoke occurs, it indicates that the cable jacket is used with halogenated raw materials.
If after long-term ignition, the surface layer of the insulation layer falls down more seriously, and the diameter does not continue to rise, it indicates that there is no appropriate radiation crosslinking treatment process. Low smoke halogen-free flame retardant cable identification method of open blister immersion. The core or cable is soaked in boiling water at 90 ° C, and the grounding resistance is usually not easy to be reduced rapidly and maintained at more than 0.1MΩ/Km.
If the maximum speed of the ground resistance is reduced or even less than 0.009MΩ/Km, it indicates that the appropriate radiation crosslinking process has not been passed. (High pressure polyethylene or high density polyethylene insulating layer material is not suitable for this way of identification, can be used in the above second way to identify). Relative density comparison method for identification of low smoke halogen-free flame retardant cables. The relative density of low-smoke halogen-free raw materials is larger than that of water, and a small amount of cable sheathing can be taken off and put into the water. If it floats above the river, it is undoubtedly not low-smoke halogen-free raw materials.
