The difference between flame retardant cables and low smoke halogen-free flame retardant cable materials

Flame-retardant cables appeared a long time ago, but almost all of these flame-retardant cables contain halogen. Although they have a certain flame-retardant effect, when a fire occurs, the burning wires and cables will still produce toxic gases and smoke. This is not only It affects the smooth progress of disaster relief work and causes secondary disasters to life and property. Now, with the increasing use of wires and cables and the frequent occurrence of electrical fire accidents, the flame retardant problem of wires and cables has gradually attracted the attention of countries around the world, and there is an urgent need to develop low-smoke halogen-free flame-retardant cable materials. So what is the difference between flame retardant cables and low smoke halogen-free flame retardant cable materials?

Flame-retardant cable materials refer to cables in which the sample is burned under specified test conditions. After the test fire source is removed, the flame spreads only within a limited range, and the residual flame or residual burn can self-extinguish within a limited time. Its fundamental characteristic is that it may be burned out and unable to operate in case of fire, but it can prevent the spread of fire. In layman's terms, in the event of a cable fire, the combustion can be limited to a local area without spreading, and various other equipment can be protected to avoid greater losses.

The insulation layer, sheath, outer sheath and auxiliary materials (taping and filling) of low-smoke halogen-free flame-retardant cable materials are all or partially made of halogen-free cross-linked polyethylene (XLPE) flame retardant materials. It has better flame retardant properties, and no halogen acid gas is released when the cable burns. The amount of smoke produced by the cable is also small. The corrosive gases generated by the cable burning are also a compromise between the cable's flame retardancy and the reduction of the generation of halogen acid gas. Developed low-halogen, low-smoke flame-retardant cables. Its halogen content is about 1/3 of that of halogen-containing flame retardant cables. The smoke output is also close to the recognized "low smoke" level.

In recent years, our country has continuously strengthened the research and development of low-smoke halogen-free flame retardant cable materials, and has made a lot of progress in the development and application of halogen-free flame retardants. I believe it will develop better in the future.