Standard parameters of low-smoke halogen-free flame-retardant cable materials
Publish Time: 2024-09-11
Low-smoke halogen-free flame-retardant cable materials refer to halogen-free (F, Cl, Br, I, At), environmentally friendly cables that do not contain lead, cadmium, chromium, mercury and other environmentally friendly materials, and will not cause harmful smoke when burned. There are many varieties, different practical applications, and different national standard parameters.For example: 70℃ low-smoke halogen-free flame-retardant thermoplastic sheath material, used in optical cable and cable sheath layer, the maximum working temperature is 70℃.The national standard parameters are as follows:The thermal shrinkage test temperature of mechanical and physical properties is 100±2℃, the duration is 1 hour, and the shrinkage rate is 4%. The test temperature of physical and mechanical properties after oil immersion is/the duration is h/the maximum change rate of tensile strength is %/the maximum change rate of tensile strength is%. The test temperature of low-temperature test low-temperature bending rate (diameter less than 12.5mm) is ℃/the test temperature of low-temperature tensile test (dumbbell test piece) is ℃/the test temperature of low-temperature impact test is -15±2℃. Corrosive (halogen-free) pH value is 4.34μs/mm1010. Maximum elongation under heat elongation test load is %/maximum elongation after cooling %/test standard: test temperature is ℃/load time is min/mechanical stress is N/cm.Physical properties of cable before aging: tensile strength is 9MPa, duration under high temperature pressure test load is 4min when outer diameter is ≤12.5mm, 6min when outer diameter is >12.5mm, test temperature is 80℃±1℃, crack test temperature is 130℃±3℃, duration is 1h. Physical properties after heat aging: aging temperature is 100℃±2℃, duration is 16h, tensile strength is 7.9MPa, with large change rate, tensile strength is 3020~120MPa, with large change rate, density is provided by each manufacturer in each bid.
