Irradiated cross-linked low-smoke halogen-free flame-retardant polyolefin B1 cable insulation material is made of high-purity polyolefin resin as the base material, adding high-quality and efficient flame retardants, cross-linking sensitizers, antioxidants and other processing aids, and is made by mixing, plasticizing and granulating. It has excellent mechanical and physical properties, electrical properties, flame retardant properties, and has high heat resistance and other characteristics. There is no precipitation pollution, it meets the relevant requirements of Rohs, etc., and it is easy to extrude and process.
Product application: It is suitable for the production of indoor and public places and other building wiring.
| Testing Items | Value | Typical Value | Unit | Method |
| Density（20℃） | ≤1.7 | 1.65 | g/cm3 | GB/T 1033 |
| Tensile strength before irradiation | ≥8 | 8.8 | MPa | GB/T 1040 |
| Elongation at break before irradiation | ≥180 | 190 | % | GB/T 1040 |
| Tensile strength before aging | ≥10 | 12.5 | MPa | GB/T 1040 |
| Elongation at break before aging | ≥150 | 165 | % | GB/T 1040 |
| Hot Extension 200℃ 0.2Mpa 15min | ||||
| The elongation rate under load | ≤100 | 30-50 | ％ | GB/T 2951.21 |
| Permanent rate of change after cooling | ≤15 | 2 | ％ | |
| Heat Deterioration 135±2℃ 168H | ||||
| Rate of change in the tensile strength | ≤±30 | 25 | % | GB/T 2951.12 |
| Rate of change of fracture elongation | ≤±30 | -29 | % | GB/T 2951.12 |
| Impact brittlement temperature（-40 ºC) | ≤15/30 | 0/30 | PCS | GB/T 5470 |
| Volume resistivity(20ºC) | ≥1.0×10^12 | 4.5×10^12 | Ω·m | GB/T 1410 |
| Dielectric strength(20ºC) | ≥20 | 30 | MV/m | GB/T 1408.1 |
| Oxygen index | ≥35 | 36 | % | GB/T 2406 |
| Amount of halogen acid gas | ≤0.5 | 0.1 | mg/g | IEC 60754 |
| PHvalue | ≥4.3 | 5.5 | - | IEC 60754 |
| Conductivity | ≤2.5 | 2 | μs/mm | IEC 60754 |
| Smoke density with flame | ≤100 | 85 | - | GB/T 8323 |
| Peak heat release rate | ≤180 | 150 | kW/m^2 | ISO/5660 |
| Total heat release | ≤180 | 105 | MJ/m^2 | ISO/5660 |
| Average heat release rate | ≤100 | 74 | kW/m^2 | ISO/5660 |
Notes：
1. Make sure the extruder screw, barrel and die are clean.
2. After the extruder temperature reaches the set value before starting, it needs to be kept constant for about 0.5 hours. When starting the machine to discharge, the melt temperature should be controlled at about 170-180℃.
3. The filter selection recommends a 60mesh + 80mesh + 60mesh combination Filter.
4. After normal startup, try to change the extruder process parameters as little as possible.
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