This European standard is applicable to the optical performance of untreated or coated materials supplied in plane sheet or strip form for use as a plane or formed reflector as well as preformed reflectors both as originally produced and after prescribed tests to determine probable maintained performance in service. This includes: a)untreated base materials, including:1)aluminium,2)steel,3)plastic,4)glass.b)surface treated materials, including:1)polished materials, 2)anodised materials,3)vacuum metallised materials,4)painted materials,5)multilayer systems.This European Standard is not applicable to fluorescent materials.