一，低(di)(di)(di)煙(yan)(yan)無(wu)(wu)(wu)鹵(lu)（Low smoke zero halogen），簡稱(cheng)有(you)(you)(you)LSZH、LSOH、LS0H、LSFH及OHLS，是(shi)(shi)在(zai)電(dian)(dian)線(xian)(xian)(xian)電(dian)(dian)纜產(chan)業中(zhong)電(dian)(dian)線(xian)(xian)(xian)護套(tao)的材(cai)(cai)料(liao)(liao)(liao)(liao)分類。低(di)(di)(di)煙(yan)(yan)無(wu)(wu)(wu)鹵(lu)電(dian)(dian)線(xian)(xian)(xian)護套(tao)是(shi)(shi)由(you)受熱(re)(re)時(shi)排煙(yan)(yan)量低(di)(di)(di)，且(qie)本身不(bu)含(han)鹵(lu)素(su)的熱(re)(re)塑性或(huo)(huo)是(shi)(shi)熱(re)(re)固性組成(cheng)。大部(bu)分的網絡線(xian)(xian)(xian)包覆(fu)層(ceng)(ceng)是(shi)(shi)由(you)聚乙烯、聚氯乙烯或(huo)(huo)熱(re)(re)塑性聚氨酯組成(cheng)。若(ruo)(ruo)著(zhu)火時(shi)，含(han)氯的塑膠會(hui)釋放(fang)有(you)(you)(you)毒(du)的氯化氫(qing)，若(ruo)(ruo)遇(yu)到(dao)水會(hui)產(chan)生鹽酸(suan)。而(er)低(di)(di)(di)煙(yan)(yan)無(wu)(wu)(wu)鹵(lu)材(cai)(cai)料(liao)(liao)(liao)(liao)在(zai)著(zhu)火時(shi)不(bu)會(hui)釋放(fang)鹵(lu)化氫(qing)或(huo)(huo)是(shi)(shi)其他(ta)酸(suan)類。低(di)(di)(di)煙(yan)(yan)無(wu)(wu)(wu)鹵(lu)材(cai)(cai)料(liao)(liao)(liao)(liao)可減少在(zai)其燃(ran)燒(shao)時(shi)產(chan)生的有(you)(you)(you)毒(du)、腐蝕性氣體。若(ruo)(ruo)在(zai)像(xiang)(xiang)飛機、火車(che)車(che)廂或(huo)(huo)是(shi)(shi)在(zai)船(chuan)舶等通風不(bu)良的環(huan)境中(zhong)，經常會(hui)使(shi)(shi)用(yong)低(di)(di)(di)煙(yan)(yan)無(wu)(wu)(wu)鹵(lu)的材(cai)(cai)料(liao)(liao)(liao)(liao)。在(zai)鐵路(lu)工業中(zhong)也普遍使(shi)(shi)用(yong)低(di)(di)(di)煙(yan)(yan)無(wu)(wu)(wu)鹵(lu)材(cai)(cai)料(liao)(liao)(liao)(liao)，因(yin)為在(zai)鐵路(lu)下方會(hui)有(you)(you)(you)高壓(ya)線(xian)(xian)(xian)路(lu)或(huo)(huo)是(shi)(shi)傳送火車(che)位置的信號線(xian)(xian)(xian)。使(shi)(shi)用(yong)低(di)(di)(di)煙(yan)(yan)無(wu)(wu)(wu)鹵(lu)材(cai)(cai)料(liao)(liao)(liao)(liao)也減少線(xian)(xian)(xian)路(lu)因(yin)失(shi)火或(huo)(huo)是(shi)(shi)短路(lu)受損時(shi)，所累計的有(you)(you)(you)毒(du)氣體。像(xiang)(xiang)在(zai)鐵路(lu)產(chan)業或(huo)(huo)是(shi)(shi)造船(chuan)產(chan)業中(zhong)，其中(zhong)很重要(yao)(yao)的需求是(shi)(shi)保護人員(yuan)及設備不(bu)會(hui)接觸到(dao)有(you)(you)(you)毒(du)、腐蝕性氣體，在(zai)這些場合中(zhong)會(hui)要(yao)(yao)求在(zai)要(yao)(yao)電(dian)(dian)線(xian)(xian)(xian)電(dian)(dian)纜外(wai)層(ceng)(ceng)使(shi)(shi)用(yong)低(di)(di)(di)煙(yan)(yan)無(wu)(wu)(wu)鹵(lu)材(cai)(cai)料(liao)(liao)(liao)(liao)。
