This International Standard specifies the equipment and procedures for determining the organic content of thermal insulating materials. The method is aimed at determining the organic content for products that are inorganic, i.e. products containing a low percentage of organic compounds, either unfaced products or the insulating material of a faced product. This International Standard is not applicable for the determination of organic content in the presence of water of hydration and/or combined carbonate, sulfate, etc. This International Standard is not applicable for the determination of organic content of adhesives, facings and/or coatings. NOTE This International Standard can be used to verify that a thermal insulating product complies with the requirements of EN 13501-1 for classification as Euroclass A1 without testing.