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About UsHongsheng Wire and Cable Co., Ltd. is a key enterprise in Zhejiang Province specializing in the production of wires and cables, integrating industry, commerce, trade, production, education, and research. Its main production, processes, and testing equipment are all designed and configured according to international standards.
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ProductsEmploy scientific management and quality assurance systems based on GB/T19001—IS09001 and GB/T24001—ISO14001 environmental management systems to organize production management.
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Contact UsWe believe: Great achievements depend on quality. Your satisfaction is our eternal pursuit!
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2021
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Types, performance, and benefits of using flame-retardant wires and cables
Flame-retardant wires and cables have special flame-retardant properties, low smoke, and toxic smoke suppression capabilities. What flame-retardant properties should the cable materials have? Below is an introduction to the types and performance of flame-retardant wires and cables, hoping to be helpful! 1. Ordinary flame-retardant wires and cables The insulation and sheath materials of flame-retardant wires and cables generally use halogen-containing polymer PVC materials. General PVC resin has high electrical insulation, chemical resistance, wear resistance, aging resistance, and low cost, making it the most widely used cable material in China. However, PVC releases carbon dioxide when burned,
Flame-retardant wire Cable With special flame retardancy, low smoke, and toxic smoke suppression capabilities, what flame retardancy should cable materials have? Below is an introduction to the types and performance of flame-retardant wires and cables, hoping to be helpful to everyone!
1. Ordinary flame-retardant wire and Cable
The insulation and sheath materials of flame-retardant wires and cables generally use halogen-containing polymer PVC materials. General PVC resin has high electrical insulation, chemical resistance, wear resistance, aging resistance, and low cost, making it the most widely used cable material in China. However, PVC releases toxic gases such as carbon dioxide, various aromatics, and chlorides during combustion.
2. Low-smoke flame-retardant wire Cable
Low-smoke flame-retardant wire Cable In the insulation and sheath materials, inorganic hydroxide flame retardants such as aluminum hydroxide and magnesium hydroxide can be added. The flame-retardant principle is that aluminum hydroxide and magnesium hydroxide absorb heat while releasing water during heating, reducing the actual temperature of the insulation and sheath materials, inhibiting material decomposition, and releasing the solid-phase flame-retardant principle of combustible gases. The generated metal oxides are refractory materials, which aim to cover the surface of the material, improve the resistance of the insulation and sheath to flames, isolate the air, and prevent combustion.
The advantages of aluminum hydroxide and magnesium hydroxide as flame retardants are as follows: non-toxic, volatile, low price, flame retardant. However, the compatibility with the matrix resin is poor, and a large amount needs to be added to achieve a certain level of flame retardancy, which will lead to a decrease in the processability and mechanical properties of the material.
3. Low-smoke halogen-free flame-retardant wire Cable
The insulation and sheath materials of low-smoke halogen-free flame-retardant wires and cables are mostly thermoplastic elastomers, and the materials do not contain halogen elements such as bromine and iodine. The flame-retardant mechanism of this cable is the interruption of the exchange flame-retardant mechanism. Stopping the replacement of the flame retardant means that the combustion disappears. Because part of the heat generated during the combustion of the flame-retardant material cannot be removed, the thermal decomposition temperature of the material cannot be maintained, and combustible gases cannot be continuously produced.
What is the difference between ordinary insulated wires and flame-retardant wires?
The difference lies in that flame-retardant wires have passed flame-retardant tests or certifications, while ordinary cables have not. There is not much difference in appearance, but domestic flame-retardant wires add the letters "ZR" in the printed word content. Foreign standards such as UL print VW-1 or CMP, CMR, etc., on them according to different flame retardancy levels.
Flame retardant Cable The fundamental characteristic is that in the event of a fire, it may catch fire and fail to function normally, but it can prevent the spread of fire. In simple terms, if the wire catches fire, the burning can be confined to a local area, preventing it from spreading and preserving other equipment to avoid greater losses.
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