B2 grade insulation material is made of high purity resin as base material, with halogen-free flame retardant, antioxidant, etc. mixed and extruded into granules. It has excellent performance such as halogen-free, heat-resistant, and weather-resistant, has no precipitation pollution, meets the relevant requirements of Rohs, and is easy to extrude and process.
Application
Related cables of GB/T 31247 standard
B2-grade low-smoke halogen-free flame-retardant polyolefin insulation material is a special type of cable material. It produces less smoke when burning and does not contain halogen, so it does not produce toxic gases. It is particularly suitable for occasions with high safety and environmental protection requirements, such as high-rise buildings, subways, power plants, nuclear power plants, rail transit and other important departments and public places.
Raw material mixing: polyolefin blended resin, inorganic flame retardants such as aluminum hydroxide and magnesium hydroxide, and antioxidants are mixed evenly in a certain proportion.
Extrusion processing: The mixed raw materials are melted and extruded through an extruder to form a cable insulation layer.
Irradiation cross-linking: The polyolefin material is cross-linked by electron beam irradiation or chemical cross-linking agents to improve its mechanical properties and heat resistance.
Low smoke and halogen-free: less smoke is produced during combustion, no halogen, and the generation of toxic gases is reduced.
Flame retardant properties: The flame retardant properties of the material are improved by adding inorganic flame retardants such as aluminum hydroxide and magnesium hydroxide.
Mechanical properties: The cross-linked polyolefin material has high tensile strength and elongation at break, which improves the mechanical properties of the cable.
Heat resistance: The cross-linked insulation material can withstand high operating temperatures and is suitable for a variety of environmental conditions.
In practical applications, B2-grade low-smoke halogen-free flame-retardant polyolefin insulation materials need to meet relevant national standards, such as GB/T 18380, to ensure that they can provide adequate safety performance in the event of a fire. With the increasing requirements for environmental protection and safety, the application prospects of this material are expected to increase further.
| Testing items | VALUE | Typicalvalue | UNIT | Method |
| Density | ≤1.65 | 1.62 | g/cm3 | GB/T1033 |
| Low-temperature brittle temperature | ≤15/30 | 0/30 | 个 | GB/T5470 |
| Environmental stress cracking resistance | ≥96 | 108 | F0/h | GB/T2951 |
| Thermal stress cracking resistance | Uncracked | Uncracked | 一 | GB/T32129 |
| Tensile strength before aging | ≥10 | 11.8 | MPa | GB/T2951 |
| Elongation at break before aging | ≥150 | 180 | % | GB/T2951 |
| Performance after aging110℃×168h | ||||
| Change rate of tensile strength | ≤±30 | 10 | % | GB/T2951 |
| Change rate of elongation at break | ≤±30 | -9 | % | GB/T2951 |
| Volume resistivity at 20℃ | ≥1.0×1012 | 5.6×1012 | Q.m | GB/T1410 |
| Dielectric strength | ≥18 | 20 | MV/m | DIN EN 6024 |
| Oxygen index | ≥35 | 37 | % | GB/T2406 |
| Smoke density flame method | ≤100 | 80 | / | GB/T8323 |
| Smoke density flameless method | ≤350 | 200 | / | GB/T8323 |
| Hydrogen halide gas content | ≤5 | 0 | m/g | GB/T17650 |
| Combustion gas pH value | ≥4.3 | 5.9 | / | GB/T17650 |
| Combustion gas conductivity | ≤10 | 6 | μs/mm | GB/T17650 |
| Water absorption test70℃×24h | ||||
| Maximum weight gain | ≤10 | 5 | mg/cm² | GB/T32129 |
| Peak heat release rate | ≤180 | 100 | kW/m2 | lS0/5660 |
| Total heat release | ≤180 | 110 | MJ/m2 | IS0/5660 |
| Average heat release rate | ≤100 | 80 | kW/m2 | 1S0/5660 |
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