Mica has good natural insulating properties and is widely used in electronic, electrical, aviation, aerospace, computer and other industries because of its high temperature resistance, high light transmission rate, low vacuum outgassing rate, light specific gravity and stable chemical properties compared to chemical synthetic insulating materials.
Fire-resistant mica tape, referred to as mica tape, is a refractory insulating material that consists of a mica paper layer and a reinforcing material layer, each of which is mixed with a sinterable inorganic compound. The sinterable inorganic compounds are metallic oxygenates, nitrides or carbides. The metal oxygenates are metal oxides, metal hydroxides, silicates, or borates. This type of mica tape is used to make electric wires, and under flame conditions, it forms a dense sintered body with the sintered inorganic compound and mica paper, which has good insulating properties, hardness and water resistance. Therefore, it can resist water shower and impact, and can meet the standards for fire-resistant wires and cables.
According to the usage, it can be divided into: fire-resistant mica tape for electric motors, fire-resistant mica tape for fire-resistant cables. According to the structure, it can be divided into: double-sided tape, single-sided tape, three-in-one tape, double-film tape, single-film tape, etc. According to the mica can be further divided into: synthetic mica tape, gold mica tape, white mica tape.
1. Mica tape three, their respective quality performance is the best synthetic mica, white mica worst, for small specifications of the cable must be selected synthetic mica tape for wrapping, Changjiang cable remind us Mica tape layered can not be used, long-term storage of mica tape easy to absorb moisture, so in the storage of mica tape must be considered when the temperature and humidity of the surrounding environment.
2. Refractory cable selection of mica tape wrapping equipment, should be used for good stability, wrapping angle is best in 300 – 400 wrapping, its mica tape wrapping uniform and tight, all and equipment by touching the guide wheel and rod must be smooth, line neatly, tension is not too large, the closing work wheel side plate and cylinder body flat and smooth.
3. For the round core with axial symmetry of the mica tape wrapped tightly in all directions, so for the conductor structure of fire-resistant cable is appropriate to use round tightly pressed conductors.
Refractory mica tape for refractory cables is a high-performance mica insulation product with excellent high temperature resistance and combustion resistance. The powder mica tape has good flexibility in normal state and is suitable for the main fire-resistant insulation layer in various fire-resistant cables. There is basically no harmful smoke evaporation when burning in open flame, so the product is not only effective but also very safe for cables.
How is the mica tape in the fire-resistant cable fireproof?
Insulation, high temperature resistance, and good heat insulation are the characteristics of mica.
The main functions of the mica tape in fire-resistant cables are：
1. To protect the inside of the cable from external high temperature for a certain period of time.
2. So that the cable at high temperatures, other insulation, protection materials are all damaged can still rely on the mica has certain insulation properties (provided that it can not touch, because then the performance insulation structure may be composed of ashes).
