Four simple methods for identifying radiation cross-linked low-smoke halogen-free flame-retardant wire and cable:
1. Product Name Identification
Wire - low smoke zero halogen flame retardant crosslinked polyolefin insulated wire and cable (WDZ-BYJ);
Cable - XLPE insulated low-smoke halogen-free flame-retardant polyolefin sheathed power cable (WDZ-YJE). In general, the name will be a little different.
2, skin burning method
There should be no obvious depressions in the insulation layer with an electric iron. If there is a large depression, the material or process used in the insulation layer is defective.
Or use a lighter to grill, under normal circumstances should be not easy to ignite, the insulation of the cable is still relatively complete after a long time of burning, no smoke and irritating odor, while the diameter has increased. If it is easy to ignite, it can be determined that the insulation of the cable is not using a low-smoke, halogen-free material (most likely polyethylene or cross-linked polyethylene).
If there is a large amount of smoke, it means that the insulation layer is made of non-low smoke material. If the insulating surface is severely detached after a long period of burning and the diameter is not significantly increased, it means that the proper crosslinking process is not performed.
3, hot water immersion method
The core or cable is immersed in hot water at 90 ° C. Under normal conditions, the insulation resistance does not drop rapidly and remains above 0.1 MΩ/Km. If the insulation resistance drops rapidly or even lower than 0.009 MΩ/Km, it indicates that it has not been treated by a suitable crosslinking process. (Polyethylene or XLPE insulation materials are not suitable for this method and can be identified by the method described in the second paragraph above).
4. Density comparison method
Low-smoke halogen-free materials generally have a higher density than water. They can be stripped of a small amount of insulating layer into the water. If it floats above the water surface, it is definitely not a low-smoke halogen-free material.
Irradiation cross-linked low-smoke halogen-free flame-retardant wire and cable has been widely recognized by the majority of electricians and electrical appliances for its excellent comprehensive electrical and physical properties, and has been applied in a series of landmark buildings such as subways, tunnels, supermarkets, doctors, etc. Shows good market prospects.
However, it is worrying that in recent years, some phenomenon of imitation or even counterfeiting of this product has been discovered, which seriously threatens the engineering quality and engineering image of key construction projects.
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