Identification method of irradiation crosslinking low smoke halogen-free flame retardant wire and cable

by:AAA     2020-02-29
Irradiation crosslinking low smoke halogen-free flame retardant wire and cable has been widely recognized by electrical and electrical workers for its excellent comprehensive electrical and physical properties, it has also been applied in a series of large-scale national landmark buildings such as the main project of the Beijing Olympic Games and the Great Hall of the People in Beijing, showing good market prospects. However, what is worrying is that in recent years, some imitation or even counterfeiting of the product has been found, which seriously threatens the engineering quality and engineering image of key construction projects. In view of this situation, the following provides some simple methods for identifying irradiated cross-linked low-smoke halogen-free flame retardant wires and cables for the reference of the industry: 1. Product name identification method wire-irradiation crosslinking low smoke halogen-free flame retardant polyethylene insulated wire and cable; Cable-radiation crosslinking low smoke halogen-free flame retardant polyethylene insulated low smoke halogen-free flame retardant polyethylene sheathed power cable. In general, the names of imitations are a little different, such as irradiated XLPE insulated low-smoke halogen-free sheathed flame retardant power cables. 2, skin burning method with electric iron ironing insulation layer should not have obvious depression, if there is a large depression, it means that the material or process used in the insulation layer is defective. Or barbecue with a lighter. Under normal circumstances, it should be difficult to ignite. After burning for a long time, the insulation layer of the cable is still relatively complete, without thick smoke and pungent smell, and the diameter increases at the same time. If it is easy to ignite, it can be determined that the insulation layer of the cable does not use low smoke halogen-free materials ( It is likely to be polyethylene or crosslinked polyethylene material). If there is large smoke, it means that the insulating layer uses halogen-containing materials. If the insulation surface falls off seriously after burning for a long time and the diameter does not increase significantly, it means that no suitable irradiation crosslinking process has been carried out. 3. Soak the wire core or cable in hot water at 90 ℃ by hot water immersion method. Under normal circumstances, the insulation resistance will not drop rapidly and remain at 0. Above 1 MΩ/Km. For example, the insulation resistance drops rapidly or even lower than 0. 009 MΩ/Km, indicating that there is no appropriate irradiation crosslinking process. ( Polyethylene or cross-linked polyethylene insulation materials are not suitable for this method of identification, and can be identified by the method of the above second article). 4. Density comparison method the density of low smoke halogen-free material is higher than that of water. You can peel off a little insulation layer and put it into water. If it floats above the water surface, it is definitely not low smoke halogen-free material.
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