極(ji)(ji)限(xian)(xian)氧(yang)(yang)指(zhi)(zhi)(zhi)數(shu)是指(zhi)(zhi)(zhi)聚合(he)物(wu)(wu)在(zai)(zai)氧(yang)(yang)和(he)氮中(zhong)當(dang)剛能(neng)支撐其燃(ran)(ran)燒(shao)時氧(yang)(yang)的(de)濃度。是表征材(cai)(cai)料(liao)燃(ran)(ran)燒(shao)行(xing)(xing)為的(de)指(zhi)(zhi)(zhi)數(shu)。極(ji)(ji)限(xian)(xian)氧(yang)(yang)指(zhi)(zhi)(zhi)數(shu)可以用燃(ran)(ran)燭(zhu)試驗測(ce)定(ding)(ding)，將一個聚合(he)物(wu)(wu)棒(bang)在(zai)(zai)特定(ding)(ding)條件(jian)(jian)下(xia)向下(xia)燃(ran)(ran)燒(shao)進行(xing)(xing)測(ce)定(ding)(ding)。通(tong)常認為極(ji)(ji)限(xian)(xian)氧(yang)(yang)指(zhi)(zhi)(zhi)數(shu)為22時，該物(wu)(wu)質可以在(zai)(zai)空氣中(zhong)燃(ran)(ran)燒(shao)。極(ji)(ji)限(xian)(xian)氧(yang)(yang)指(zhi)(zhi)(zhi)數(shu)是指(zhi)(zhi)(zhi)在(zai)(zai)規定(ding)(ding)的(de)條件(jian)(jian)下(xia)，材(cai)(cai)料(liao)在(zai)(zai)氧(yang)(yang)氮混合(he)氣流中(zhong)進行(xing)(xing)有焰(yan)燃(ran)(ran)燒(shao)所(suo)需(xu)的(de)最低(di)氧(yang)(yang)濃度。以氧(yang)(yang)所(suo)占(zhan)的(de)體積的(de)數(shu)值(zhi)來表示(shi)。

至少準備15個樣品。

紡織品：尺寸為150*58mm。

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