Unlike PVC cables and those made of other compounds which produce vast amounts of dense black smoke, toxic fumes and acid gas when exposed to fire, LSZH. Low smoke zero halogen or low smoke free of halogen is a material classification typically used for cable jacketing in the wire and cable industry. WHAT DOES LOW-SMOKE, ZERO-HALOGEN (LSZH) MEAN? The term “low- smoke, zero-halogen” describes two distinct properties of a cable compound. Find here LSZH Wire, ZHFR Wire manufacturers, suppliers & exporters in India. The rise of LSZH cables.