The ISO 45879-3 standard, developed by the International Organization for Standardization (ISO), is intended to extend existing methods for determining flammability with the oxygen index (OI) to the typical high temperatures a plastic material can be exposed to in service. It also provides a method for determining the temperature at which a small bar of material is supported to burn in air under certain test conditions; The resulting temperature is called the flammability temperature.
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 in a temperature range of 25 °C to 150 °C. The temperature range is typically between 40 °C and 150 °C. Results are defined as temperature index values at test temperature, which is typical of the practical temperature a plastic material can experience in an overheated service condition.
Methods are provided for testing self-supporting materials at test temperature in the form of vertical bars or sheets up to 10,5 mm thick. However, they do not apply to the V form, which requires a support framework as defined in ISO 4589‑2:2017. These methods are suitable for solid, layered or cellular materials characterized by an apparent density of 100 kg/m3 or higher. The methods are also applicable to certain 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.
ISO 4589-3 also includes a method (see Appendix A) for determining the temperature at which the OI in air of small vertical test specimens under specified test conditions is 20,9%. The temperature at which this occurs is defined as the flammability temperature (FT), and the method is limited to determining temperatures below 400 °C. The method is not valid for materials with <20,9% OI.
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