The ISO 8301 standard, developed by the International Standards Organization (ISO), defines the use of the heat flow meter method to measure the steady-state heat transfer across flat plate samples and to calculate the heat transfer properties of the samples. This is a secondary or relative method as the ratio of the thermal resistance of samples to that of a standard sample is measured.
Numerous tests are performed on light-density porous materials. In such cases, the actual heat transfer in them may involve a complex combination of different additives.
Heat transfer by radiation is the primary source of the dependence of the transfer factor on sample thickness. As a result, not only the material properties but also the radiation properties of the surfaces bounding the sample affect the results. Therefore, thermal resistance is the property that better describes the thermal behavior of the sample, provided it is accompanied by information about the limiting surfaces.
The design and subsequent correct operation of a heat flow meter (HFM) device is a complex issue that requires great care to obtain accurate results and to interpret test results. It is recommended that the designer, operator, and user of the measured data of the HFM instrument have a thorough knowledge of the heat transfer mechanisms in the materials, products, and systems under consideration, along with experience in electrical and temperature measurements, particularly at low signal. levels. Good laboratory practices in accordance with general testing procedures should also be maintained.
Many different designs of heat flow meters exist around the world to comply with current national standards. Continuous research and development work continues to improve device and measurement techniques. It is therefore impractical to mandate a specific device design or size, especially since overall requirements can vary quite widely.
Among the services provided by our company, EUROLAB, within the framework of material testing services, there are also ISO 8301 standard tests.
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