标准编号：ISO 4589-3:2017
中文名称：塑料 通过氧指数测定其燃烧性 第3部分：升温试验
英文名称：Plastics — Determination of burning behaviour by oxygen index — Part 3: Elevated-temperature test
发布日期：2017-04
标准范围
This document specifies methods for determining the minimum volume fraction of oxygen, in a
mixture with nitrogen, that will support combustion of small vertical test specimens under specified test conditions over a range of temperatures between 25°C and 150°C. The range of temperatures is typically between 40°C and 150°C. The results are defined as temperature index values at the test temperature, which is typical of the practical temperature that a plastic material can experience in an overheated service situation.
Methods are provided for testing materials that are self-supporting at the test temperature in the form of vertical bars or sheet up to 10,5 mm thick. However, they are not applicable to form V which requires a supporting frame as defined in ISO 4589-2:2017, Table 2. These methods are suitable for solid, laminated 3 or cellular materials characterized by an apparent density 100 kg/m3 or higher. The methods are also applicable to some cellular materials having an apparent density of less than 100 kg/m3 . A method is provided for testing flexible sheet or film materials while supported vertically.
This document also includes a method (see Annex A) for determining the temperature at which the
OI of small vertical test specimens in air is 20,9 % under specified test conditions. The temperature at which this occurs is defined as the flammability temperature (FT) and the method is limited to the determination of temperatures less than 400°C. The method is not applicable to materials having an OI of <20,9 %.
NOTE 1 It might not be possible to apply these methods satisfactorily to materials that exhibit high levels of shrinkage when heated, e.g. highly oriented thin film.
NOTE 2 For assessing the flame propagation properties of cellular materials of density <100 kg/m3 , attention is drawn to the method described in ISO 3582.
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