Low smoke zero halogen (Low smoke zero halogen), hereinafter referred to as LSZH, LSOH, LS0H, LSFH and OHLS, is in the wire and cable industry wire sheath material classification. Low smoke zero halogen wire sheath is made when heated exhaust volume is low, and does not contain halogen thermoplastic or thermosetting.
Most of the cladding layer network line is composed of polyethylene, polyvinyl chloride (PVC), or thermoplastic polyurethane. If fire, chlorine plastic will release toxic hydrogen chloride, if encounter water hydrochloric acid is produced. And at the time of the fire low smoke zero halogen material will not release hydrogen halide or other acids.
Low smoke zero halogen material that, when burned, can reduce the toxic and corrosive gas. If as plane, train or car in poorly ventilated environment such as ships, often using low smoke zero halogen material. In the railway industry is also commonly used low smoke zero halogen material, because there will be a high pressure at the bottom of the railway lines or transfer the train position signal lines. Use low smoke zero halogen material also reduce line damaged by fire or short circuit, the accumulative total of toxic gases.
Like in the railway industry and shipbuilding industry, the important requirement is to protect the personnel and equipment will not come into contact with toxic and corrosive gas, in these situations will require to use low smoke zero halogen wire and cable outer material.