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This European Standard specifies the characteristics and performance of thermal/acoustic insulation composite panels made of an insulating material laminated to gypsum plasterboards for which the main intended use is the internal insulation (thermal and/or acoustic) of walls. They are attached with adhesives or by mechanical fixings to vertical solid backgrounds and by mechanical fixings to wood or metal framing with the plasterboard face exposed. The method of fixing and jointing shall ensure that the insulating material is not exposed in its normal application This European Standard covers the following performances characteristics: reaction to fire, fire resistance, water vapour permeability, flexural strength, impact resistance, direct airborne sound insulation and thermal resistance to be measured according to the corresponding European test methods. It provides for the evaluation of conformity of the products to this European Standard. This European Standard covers also additional technical characteristics that are of importance for the use and acceptance of the product by the construction industry.