请教
各们,我昨天发的贴怎么找不到了?再重复昨天的问题:在IEC60335-1内cl.30.2.1提到材料防火等级HB40是如何一回事，是否HB等级材料与94V-0，94V-2一样有防火等级高低之分；若有，如何区分？我只知有HB......嘿 是有等级之分的,一般按美规,V-0是最好的,家电中用到的一些胶料,如果有UL证书,这些燃烧等级的信息在证书上可以找到 引用第0楼sany.wang于2007-11-26 20:51发表的 请教 :各们,我昨天发的贴怎么找不到了?再重复昨天的问题:在IEC60335-1内cl.30.2.1提到材料防火等级HB40是如何一回事，是否HB等级材料与94V-0，94V-2一样有防火等级高低之分；若有，如何区分？我只知有HB......嘿
阻燃等级：5VA、5VB、V0、V1、V2、HB75、HB40 阻燃性能越来越差！
V0与5v的测试方法不同，可能有些材料同时满足5V 和V0 我想请问HB材料有等级之分吗? 我也是第一次看到 HB75, HB40. 是呀,这是怎么回事,哪位知道? The materials shall be classified HB, HB40 or HB75 (HB = horizontal burning) in accordance
with the criteria given below.
8.4.1 A material classified HB shall conform to one of the following criteria:
a) it shall not visibly burn with a flame after the ignition source is removed;
b) if the test specimens continue to burn with a flame after removal of the ignition source, the
flame front shall not pass the 100 mm mark;
c) if the flame front passes the 100 mm mark, it shall not have a linear burning rate exceeding
40 mm/min for a thickness of 3,0 mm to 13,0 mm or a burning rate not exceeding
75 mm/min for a thickness of less than 3,0 mm;
d) if the linear burning rate does not exceed 40 mm/min for tests with 3,0 mm ± 0,2 mm
thickness, it shall automatically be accepted down to a 1,5 mm minimum thickness.
8.4.2 A material classified HB40 shall present one of the following criteria:
a) it shall not visibly burn with a flame after the ignition source is removed;
b) if the test specimens continue to burn with a flame after removal of the ignition source, it
shall not have the flame front pass the 100 mm mark;
c) if the flame front passes the 100 mm mark, it shall not have a linear burning rate exceeding
40 mm/min.
8.4.3 A material classified HB75 shall not have a linear burning rate exceeding 75 mm/min, if
the flame front passes the 100 mm mark.
楼上的，看完上面的英文，你就知道了。
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