This European Standard specifies the requirements for loose-fill expanded clay lightweight aggregate products for in-situ installation in roofs, ceilings, floors and ground floors. This Part 1 of the standard is a specification for the insulation products before installation. This Part 1 of the standard also describes the product characteristics and includes procedures for testing, 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 standard does not specify performance requirements for airborne sound insulation and for acoustic absorption applications.