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New standard for flame-retardant rubber compounds officially implemented! Unveiling the key technology behind the oxygen index of 38+ for mixed rubber used in fire hoses.
Nov 12,2021
The new GB6246 standard requires that the oxygen index of fire hose rubber compounds be ≥32. Xiangshang Rubber achieved a breakthrough through three steps:
- Base glue preferred A flame-retardant matrix is constructed using chloroprene rubber/nitrile rubber (70/30 ratio).
- Synergistic system Zinc borate (15 PHR) + aluminum hydroxide (40 PHR) form a biphasic barrier layer.
- Reinforcement process Nano kaolin (specific surface area of 28 m²/g) enhances char yield.
Tested by the National Fire-Resistant Materials Center:
- The oxygen index reaches 38.5 (exceeding the national standard by 20%).
- Combustion rate at a 45° inclination ≤ 25 mm/min
- Low-temperature bendability (-40℃) without cracking
This achievement has been implemented in large-scale applications within high-rise building fire protection systems.
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