Allied Encyclopedia – What is Low Smoke Zero Halogen (LSZH) Cable?

Allied EncyclopediaLow Smoke Zero Halogen (LSZH) is a term used to describe a certain kind of cable jacketing. LSZH cables produce little smoke when burning and do not emit halogens when they come in contact with fire.

Halogens are chemical elements that form dangerous gases in the presence of fire. Chlorine, fluorine, and bromine, specifically, are the halogens of most concern for the wire and cable industry. In a fire, these gases are extremely damaging to the human respiratory system and can even corrode nearby equipment. LSZH cables emit few to zero halogens and can help avoid these dangers.

Because LSZH cables are low-smoke, people can make a quicker and easier escape in the event of a fire. There is far less smoke to limit their ability to see and breathe, allowing them to get out with less trouble. Less smoke also leads to less property damage caused by soot.

These qualities make LSZH cable desirable and common for applications where people are present in poorly ventilated or confined spaces, like airplanes, rail cars, or offshore marine platforms. Using LSZH cable is a safety precaution as well as a method of fire prevention. And as a bonus, LSZH cables have a relatively low coefficient of friction, making for easy installation.

Although LSZH cables have some important benefits, there is a trade-off. To  qualify as low smoke zero halogen cable, the jacket must have a high percentage of filler material. This means that the jacket will likely be less chemical and water-resistant and have poorer mechanical and electrical properties than a non-LSZH cable jacket. LSZH cables are also more likely to experience jacket cracking during installation, so special lubricants are needed to avoid damage.

Overall, LSZH cable is a good choice when fire safety is a main concern, and some electrical and mechanical properties can be sacrificed in exchange.

LSZH cable is also commonly called: low smoke and fume (LSF), low smoke halogen free (LSHF), and low smoke zero (0) halogen (LS0H).

Want to learn more? Visit Allied’s Halogen-Free Cable FAQs.

About awcwire
Allied Wire & Cable is a value-added manufacturer and distributor of electrical wire and cable, tubing, and more. We are a family owned and operated company, serving a wide range of industries, including the military, automotive, aerospace, and telecommunications markets. Allied is headquartered in Collegeville, PA. Additional locations can be found across the US, in Merrimack, NH, Tampa, FL, Pewaukee, WI, and Las Vegas, NV. For more information on Allied, visit our main website at

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