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Latest revision as of 10:17, 27 March 2010

Low smoke zero halogen or low smoke free of halogen (LSZH or LSOH or LS0H or LSFH) is a material classification typically used for cable sheath/jacketing in the wire and cable industry. LSZH cable sheath/jacketing is composed of thermoplastic or thermoset compounds that emit limited smoke and no halogens when exposed to high sources of heat (ie. flame).

Most network cables are insulated with polyethylene, PVC or Thermoplastic Urethane (TPU) . In fires, a halogen-containing plastic material releases hydrogen chloride, a poisonous gas, which forms hydrochloric acid when it comes in contact with water which can also damage other electrical equipment. Designated Halogen-free cables, on the other hand, does not produce a dangerous gas/acid combination or toxic smoke when exposed to a flame.

Low smoke zero halogen cable reduces the amount of toxic and corrosive gases emitted during combustion. These types of materials are typically used in poorly ventilated areas such as aircrafts or rail cars. Low smoke zero halogen is becoming very popular and in some cases a requirement in instances where the protection of people and equipment from toxic and corrosive gasses is critical.