Low-smoke halogen-free flame-retardant cables refer to environmentally friendly cables made of rubber materials that do not contain halogens (F, Cl, Br, I, At), lead, cadmium, chromium, mercury and other environmental substances, and do not emit toxic smoke when burned.
Low-smoke halogen-free cables have excellent flame retardant properties, very little smoke when burning, and no corrosive gas escapes. They are widely used in nuclear power plants, subway stations, telephone exchanges and computer control centers, high-rise buildings, hotels, radio and television stations, important military facilities, oil platforms, etc., as well as places with concentrated personnel and low air density. Here are some common low-smoke halogen-free flame-retardant cable materials.
1. Plastic low-smoke halogen-free flame-retardant materials
Low-smoke halogen-free flame-retardant sheath materials have temperature resistance grades of 70℃ and 90℃. Generally, the product oxygen index is required to reach above 32. It has good mechanical properties and processing properties and can be widely used in the classification and application of power cables, communication cables, low-smoke halogen-free cable materials, control cables, marine cables, etc. Sheath layer.
2. Thermoplastic low-smoke halogen-free flame-retardant insulation material
The performance of low-smoke halogen-free flame-retardant insulation material is similar to that of low-smoke halogen-free sheath material, but the insulation performance requirements are higher. It can be used for the insulation layer of power cables, communication cables, electronic wires, etc.
3. Thermoplastic low-smoke halogen-free flame-retardant oxygen barrier layer
This material is used for the inner sheath layer of power cables with high flame retardant requirements, which can improve the overall flame retardant effect of the cable and appropriately reduce the flame retardant requirements for the cable insulation sheath layer. 4. Irradiation cross-linked low-smoke halogen-free special cable material
Irradiation cross-linked low-smoke halogen-free special cable materials are generally used in some special occasions, such as locomotives, oil exploration, and ships. Cables are generally required to have oil resistance and high temperature resistance. Photovoltaic cables used for solar power generation not only require a higher temperature resistance grade, but also have good heat resistance life. Cables used in nuclear power plants require excellent radiation resistance and heat aging resistance.
5. Soft low-smoke halogen-free flame-retardant elastic material
Soft low-smoke halogen-free material refers to elastic material with hardness in the range of 75-85 (shoreA) (the hardness of ordinary halogen-free material is around 95. As the hardness of the material decreases, the physical and mechanical properties, heat deformation resistance, flame retardant properties, etc. of the product will be affected to a certain extent. It is mainly suitable for some occasions with softness requirements such as flat cables for elevators, large square automotive wires, and electronic wires with high softness requirements.
6. Oil-resistant low-smoke halogen-free flame-retardant cable
Now many occasions such as locomotive cables, cables for oil platforms, marine cables, oil seals, etc. require materials to have both high temperature resistance and oil resistance and flame retardant properties. Oil resistance conditions mainly refer to resistance to engine oil and diesel. The heat resistance grade generally requires 105℃～150℃, and flame retardant generally requires single combustion. .
7. Low-smoke halogen-free flame-retardant cable materials for photovoltaic cables
Low-smoke halogen-free cables for photovoltaics are a branch that has developed rapidly in recent years. At present, domestic products mainly meet the two major standards of Rhine TUV and UL. The characteristics of its products are that the materials are required to have good heat aging resistance, acid and alkali resistance, water resistance, high temperature resistance and flame retardancy.
8. Low-smoke halogen-free flame-retardant cable materials for nuclear power cables
Nuclear power is one of the development directions of new energy. Cables suitable for nuclear power plants are divided into insulation and sheath. The materials used for cables are required to have good radiation resistance, especially excellent heat life aging performance. In addition, nuclear power cables are generally required to have a thermal life of 40 or 60 years, and the cables have excellent flame retardant properties. Cables of various specifications must pass single vertical combustion or bundle combustion Class A and Class B.
