The main difference is in the outer sheath material of the cable. The insulation layer and sheath of halogen-free low smoke flame-retardant cables have better flame-retardant properties, and the smoke emission of the cables is also small, with lower toxicity. The price of halogen-free low smoke flame-retardant cable is higher.
1. A flame-retardant cable is a cable that, under specified test conditions, the sample is burned, and after removing the test flame source, the flame spread is only within a limited range, and the residual flame or ignition can extinguish itself 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 the fire. Simply put, if a cable catches fire, it can limit the combustion to a local area, prevent spread, protect other equipment, and avoid causing greater losses.
2. The insulation layer, sheath, outer protective layer, and auxiliary materials (wrapping and filling) of halogen-free low smoke flame-retardant cables are all or partially made of halogen-free cross-linked polyethylene (XLPE) flame-retardant materials, which not only have better flame-retardant properties, but also do not emit halogen acid gas during cable combustion.
The smoke emission of cables is also small, and the corrosive gas generated by cable combustion is also a compromise between cable flame retardancy and reducing the amount of halogen acid gas generated. A low halogen and low smoke flame retardant cable has been developed. Its halogen content is about one-third of that of halogen containing flame-retardant cables. The amount of smoke emitted is also close to the recognized "low smoke" level.
Skype: verdecable