flame-retardant wire
Product Classification:
flame-retardant wire
Keyword:
Cable
Product Features
The main production of "Hengshun" brand wire and cable, products cover 35KV and below high and low voltage wire and cable, photovoltaic cable, rare earth aluminum alloy cable, irradiated cross-linked cable, mineral insulated fireproof cable and other 32 series more than 8000 specifications.
Product Details
flame-retardant wire
1. Flame-retardant wire: Flame-retardant wire can prevent the wire from burning to a certain extent. In the event of a fire, flame-retardant wire can control the fire within a localized area, thus preventing the spread of flames. Compared to ordinary wires, it has a higher temperature resistance, stronger aging resistance, and a longer service life. The burning degree of flame-retardant wire is much less than that of ordinary wire, and after leaving the fire, the flame will self-extinguish. The smoke produced is also a relatively transparent white, rather than thick black smoke. With the increasing number of household appliances and their growing power, flame-retardant wire is becoming more popular in home decoration for safety reasons.
2. Fire-resistant wire: In general, fire-resistant wire refers to wire that can maintain operation for a certain period under flame conditions, meaning it can keep the circuit intact. This type of wire has a certain power supply capability in flames. According to national testing standards (GB12666-99), fire-resistant wire can be divided into two grades: NHA and NHB. In general product naming, NHA is usually represented as GNH, which is classified as high fire-resistant wire. NHB is represented as NH in general fire-resistant products. Fire-resistant wire can continue to work (transmit current and signals) during a fire, and its own ability to resist burning is not part of the assessment. Flame-retardant wire quickly stops working during a fire, and its function is to be difficult to ignite and self-extinguishing. Fire-resistant wire can maintain normal operation for 180 minutes in flames of 750~800℃. Modern office buildings, hotels, restaurants, train stations, and other important public places are becoming increasingly luxurious, with more combustible materials used. Major cities in the country are successively building subway lines, and these important public places require that in the event of a fire, the wire can continuously supply power and transmit various control signals and alarm signals, providing valuable time for people's escape, automatic alarms, the activation of fire-fighting facilities, rescue, and the use of emergency equipment. Therefore, the reliability of fire-resistant wire is crucial.
3. Low-smoke halogen-free wire: The main feature of low-smoke halogen-free wire is that when the product burns, it only produces a faint water mist, with a visibility distance of over 60 meters, and does not contain any toxic substances. Through cross-linking technology, the wire achieves flame-retardant effects; it is aging-resistant, with a lifespan of over 100 years, and a maximum working temperature of up to 150 degrees. The main component of the extrusion equipment for low-smoke halogen-free cables is the screw, which relates to the application range and production efficiency of the extruder. To meet the needs of different plastic processing, there are many types of screws. Low-smoke halogen-free flame-retardant cable materials contain high-fill magnesium hydroxide or aluminum hydroxide, so for screw selection, ordinary type screws are generally used, and the compression ratio should not be too large, typically between 1:1 and 1:2.5 is more suitable. Another important factor affecting the extrusion of low-smoke halogen-free cable materials is the cooling device of the extruder. Due to the special nature of low-smoke halogen-free materials, large heat is generated during the extrusion process due to friction, which requires the extrusion equipment to have a good cooling device to control the process temperature. This is an issue that cannot be ignored; if the temperature is too high, it will cause large pores on the surface of the cable, while if the temperature is too low, it will increase the overall current of the equipment, easily damaging it. Due to the high filling of low-smoke halogen-free cable materials, there are significant differences in the strength, stretch ratio, and viscosity of the melt in a molten state compared to other cable materials, so the selection of molds is also different. First, the choice of extrusion method for the mold should be made. For the extrusion of low-smoke halogen-free cable materials, the insulation extrusion mold should be selected as a pressing type, while a semi-pressing type should be used during the sheath extrusion process to fully ensure the material's tensile strength, elongation rate, and surface finish. Secondly, the choice of mold sleeve is important; when using a pressing type mold, due to the high viscosity of the material, the pressure at the head is very high, and when the extrusion leaves the mold, it will expand, so the mold sleeve should be slightly smaller than the actual size.
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