LIQUID-TUFF LSZH Liquidtight Flexible Metal Conduit is a Low Smoke Zero Halogen raceway designed for applications where off gasing and flame spread are a concern. Made of polyurethane and nylon jackets, LIQUID-TUFF LSZH Liquidtight Flexible Metal Conduit are non-halogen emitting, have a low flame spread that release low amounts of non-toxic smoke, and self-extinguish. Falling well below the allowable maximums all Zero-Halogen conduits meet the following standards: ASTM E 162 Flame Spread Index, ASTM E 662 Smoke Density Generation, Bomardier SMP-800C Toxic Gas Generation, UL 94 Tests for Flammability of Plastic Materials for Parts.