... core SM 900μm tight buffer fiber + aramid yarn +LSZH (Low smoke, Zero halogen, Flame-retardant ) jacket. ... Backbone building distribution cabling.4. Installation: wall, interlayer, pipe, trough, ductMulti-fiber Tight Buffer Fiber Optic Cable characteristics ... l Jacket material: PVC (Environmental lame-retardant polyvinylchloride), LSZH (Environmental low smoke zero halogen flame retardant polyolefin), ...