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This European Standard specifies the requirements for factory made cellular glass products, with or without facings, which are used for the thermal insulation of buildings. The products are manufactured in the form of boards or slabs. This standard describes product characteristics and includes procedures for testing, evaluation of conformity, marking and labelling. Products covered by this standard are also used in prefabricated thermal insulation systems and composite panels; the performance of systems incorporating these products is not covered. This standard does not specify the required level of a given property to be achieved by a product to demonstrate fitness for purpose in a particular application. The levels required for a given application are to be found in regulations or non-conflicting standards. Products with a declared thermal resistance lower than 0,50 m².K/W or a declared thermal conductivity greater than 0,065 W/(m.K) at 10 °C are not covered by this standard. This standard does not cover products intended to be used for the insulation of building equipment and industrial installations. This standard does not cover the following acoustical aspects: Direct airborne sound insulation and impact noise transmission.