This European Standard specifies the requirements for expanded perlite products for in-situ installation in roofs, ceilings, walls and floors. This Part 1 of the standard is a specification for the insulation products before installation covering the five product types, Perlite Aggregate (EPA), Coated Perlite (EPC), Bitumen Coated Perlite (EPB), Hydrophobic Perlite (EPH) and Premixed Perlite (EPM). Part 1 of this European Standard describes the product characteristics and includes procedures for testing, evalua-tion of conformity, marking and labelling. 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. This European Standard does not cover factory made insulation products of formed shapes and boards made with expanded perlite. The products covered by this standard are not intended to be used primarily for airborne sound insulation or sound absorption applications although they may improve the performance of the buildings in these respects when installed for their primary thermal insulation intended use.