LSF / LSH / LSZH

Low Smoke & Fume, Low Smoke & Halon, or Low Smoke Zero Halogen.

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

Low smoke zero halogen cable reduces the amount of toxic and corrosive gas emitted during combustion. This type of material is typically used in poorly ventilated areas such as aircraft or rail cars. Low smoke zero halogen is becoming very popular and, in some cases, a requirement where the protection of people and equipment from toxic and corrosive gas is critical.

Other benefits of halogen free cable include:

  • It is often lighter, so overall cable network system weights can be reduced.
  • The environmental impact of halogen free cabling can be lower if there are fewer toxic chemicals.
  • Low smoke versions of commonly available PVC cables are readily available.
    e.g. BS 7211 for the PVC-sheathed BS 6004, and BS 6724 for the PVC-sheathed BS 5467.

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