What is the difference between flame-retardant cable and fire-resistant cable?

Most people can easily confuse the concept of flame-retardant cables and fire-resistant cables. Although flame-retardant cables have many advantages that are more suitable for chemical companies, such as low-halogen, low-smoke and flame retardant, in general, fire-resistant cables can replace flame-retardant cables. Fire-retardant cables cannot replace fire-resistant cables. The main difference between them is:

Difference between 1 principles

The principle of fire-resistant cable and flame-retardant cable is different. Halogen-containing cable flame retardant principle is based on the flame retardant effect of halogen, halogen-free cable flame retardant principle is to reduce the temperature by precipitation of water to extinguish the fire. Fire-resistant cables rely on the fire-resistant and heat-resistant properties of the mica material in the fire-resistant layer to ensure that the cable is working properly in the event of a fire.

2 Difference between structure and material

The structure and materials of fire-resistant cables are also different from those of flame-retardant cables.

The basic structure of the flame-retardant cable is:

(1) Flame retardant material for insulation

(2) The flame retardant material is used for the sheath and outer sheath;

(3) Flame retardant materials are used for wrapping and filling.

The fire-resistant cable is usually an additional fire-resistant layer between the conductor and the insulating layer. Therefore, in theory, a flame-retardant layer can be added to the structure of the flame-retardant cable to form a flame-retardant and fire-resistant cable, but the actual There is no need for this.

Because of the refractory layer of fire-resistant cables, multilayer mica tape is usually used to directly wrap around the conductors. It can withstand long-term combustion, even if the polymer in the flame is burned, it can ensure the normal operation of the line.