With the development of society, the requirement for cable is also increasing, and the classification of cable is more detailed, such as fire-resistant, flame-retardant, low smoke halogen-free cable also appears in our daily life, so how to distinguish these cables?Then, let's talk about how to identify halogen-free electronic wires.
It can be distinguished by the following:
1. Product Name Identification Method: Wire--Low Smoke Halogen-free Flame-retardant Polyethylene Insulated Cable; Cable--Low Smoke Halogen-free Flame-retardant Polyethylene Insulated Low Smoke Halogen-free Flame-retardant Polyethylene Sheathed Power Cable.Copies generally have a slightly different name, such as polyethylene insulated low-smoke halogen-free sheathed flame-retardant power cables.
2. Epidermal scalding: If the insulating layer of halogen-free electronic wires is ironed with electric cautery, there should be no obvious depressions. If there are large depressions, the materials or processes used in the insulating layer are defective.Or grilling with a lighter should normally be non-ignitable. After a long period of burning, the insulation layer of the cable is still complete, there is no smoke or irritating smell, and the diameter increases.
If ignition is easy, it can be determined that the insulation layer of the cable is not made of low-smoke halogen-free discharge material (most likely polyethylene or cross-linked polyethylene).If a large amount of smoke occurs, the insulation layer is made of halogen-containing materials.If the insulation surface falls off severely and the diameter does not increase significantly after long time burning, it means that no suitable irradiation crosslinking process has been applied.
3. Hot water immersion.If the core or cable is immersed in hot water at 90 C, the insulation resistance will not decrease rapidly and remain above 0.1M/Km under normal conditions.
If the insulation resistance drops rapidly even below 0.009M/Km, it means that no suitable irradiation crosslinking process has been applied.(Polyethylene or crosslinked polyethylene insulating materials are not identified by this method and can be identified by the method described in Article 2 above).
4. Density comparison.Halogen-free wire materials have a higher density than water, and can be stripped off a few insulation layers and put into the water. If they float above the water, they are definitely not low-smoke halogen-free materials.