Full definition
A self-extinguishing conveyor belt that will not propagate flame and provides electrical conductivity to prevent static buildup ignition, mandatory for underground mining, tunnels, enclosed conveyors, and areas with explosive dust or gas. Standards: ISO 340 (flame propagation test — belt must self-extinguish within specified distance), ISO 284 (electrical conductivity — surface resistance ≤300 MΩ), and EN 12882 (categories S, K, Vs, Ks). DIN 22109 for German mine approval, MSHA approval in the US. Compounds: chloroprene (CR) is the traditional flame-retardant rubber due to its chlorine content; PVC is used in light-duty fire-resistant belts. Flame retardant additives: ATH (alumina trihydrate), antimony trioxide, chlorinated paraffins. Carcass: EP with flame-retardant skim. Steel cord versions also available for long, high-tension underground systems. Testing includes both drum friction (simulating belt slip on a locked drum causing heat) and propane burner tests. Applications: coal mines, potash mines, underground tunnels, grain elevators, wood processing.