This European Standard is a specification for thermoplastic compression mouldable sheet consisting of textile glass mat reinforced polypropylene or equivalent products, as described in Part 1 of this specification. The parameters to be defined in any GMT specification are defined in 4.1. Parameters to be specified are those, which should typically appear on data sheets. Only a selection of these parameters should be included on the certificate of conformity. The other parameters which are included in a specification should either be nominated by the manufacturer, or agreed between manufacturer and customer. These parameters are defined in 4.2. A selection of the specified parameters should be used for quality control purposes to check the conformity. The specification defines which parameters should be used for checking the conformity of the material. These parameters are defined as part of 4.1. Other specified parameters may be included if critical for a particular application or processing method. This is to be agreed between manufacturer and customer of a production lot and will be reported in the certificate of conformity, which should be in accordance with EN 10204.