GEPVP CPD 4 (EN12150-2).EN.indd - Glass for Europe

Construction Products Directive5.2.2.4 Measurement of surface pre-stressThe manufacturer may also use surfacepre-stress measurement as a means ofproduct control. If this is done then all testspecimens shall be measured prior to testing.This will show the relationship betweensurface pre-stress and mechanical strength/fragmentation.Manufacturers with more than one productionline may perform the initial type test onspecimens from one line. The outcome valueof surface pre-stress measurement may thenbe used as reference for the other productionlines and shall be confirmed by factoryproduction control (FPC). This may also beapplied to new production lines.Measurement of surface pre-stress can beundertaken as a means of product control,(see Table A.1-3.1.4.1), for thermally toughenedfloat glass.The test should be undertaken as detailed inAnnex B.1.2.5.2.2.5 Thermally toughened patterned glass16Initial type testing of thermally toughenedpatterned glass may not be undertaken asa result of the wide variety of patternedsurfaces of patterned glass in accordancewith EN 572-5.Compliance of thermally toughened patternedglass shall be ensured by the sampling duringproduct control given Annex A – Table A.1– 3.1.3 together with either 3.1.4.2 or3.1.4.3.If a manufacturer only toughens a small numberof pattern types/thicknesses then it may beworthwhile to subject test specimens to themechanical strength and fragmentation tests(see 5.2.2.1).However, a manufacturer can produce theseproducts as long as they ensure by the factoryproduction control, especially product control,that they meet the requirements.Attachment 3: hEN Clause 6 Marking and labelling6.2 Product markingThe thermally toughened soda lime silicatesafety glass product shall be marked inaccordance with Clause 10 of EN 12150-1.The manufacturer shall permanently mark with:- name or trade mark- EN 12150