标准编号：ISO 4589-4:2021
中文名称：塑料 用氧指数测定燃烧性能 第4部分：高气体速度试验
英文名称：Plastics — Determination of burning behaviour by oxygen index — Part 4: High gas velocity test
发布日期：2021-04
标准范围
This document specifies a test method for determining the minimum volume fraction of oxygen, in admixture with nitrogen, at ambient temperature, that supports combustion of small vertical sheet test specimen under a specified gas velocity that is higher than that specified in ISO 4589-2.
NOTE The result is expressed as a high gas velocity oxygen index (HOI).
In addition, this document specifies the testing apparatus for determining the HOI.
The test method is applicable to materials in the form of sheets up to 2 mm thick. It is also applicable to flexible sheet materials that are supported vertically by a specified specimen holder.
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