EN50267-2-2电缆材料腐蚀性/酸性测试

EN50267-2-2 Common test method for cables under fire conditions-tests on gased evolved during combustion of materials form cables-Part 2:Procedures-Determination of degree of acidity of gased for materials by measuring PH and conductivity.
EN 50267-2-2 着火条件下电缆的通用试验方法，电缆材料燃烧时产生的气体的试验，程序，通过测量PH值和传导率测定材料燃烧产生的气体的酸度。

pH值是衡量水体的酸碱度的一个值，范围是0~14，是水体中氢离子浓度的Lg负数，pH<7为酸性，越小酸性越强，pH=7为中性，pH>7为碱性，越大碱性越强。

电线电缆无卤或零卤的规定

where no requirements are specified in the particular cable specification, and where the cable is described as "zero halogen" or "halogen-free" it is recommended that at least both the following requirements should be met for each of the individual materials of a cable construction.

a)the PH value as determined in 6, should not be less than 4.3, when related to one litre of water.
b)the conductivity value as determined in 6, should not exceed 10us/mm, when related to one litre of water.

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 来源：防火网  发布时间：6/3/2014  点击次数：3642