This European Standard defines and classifies basic alkaline earth silicate glasses for use in building. It indicates their chemical omposition, main physical and mechanical properties, dimensional and minimum quality requirements (in respect of optical and visual faults).The standard applies to basic alkaline earth silicate glasses supplied in jumbo sizes, split sizes and final cut sizes.It does not apply to final cut sizes having a dimension less than 100mm or a surface area less than 0,05 m2.