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Plastics. Poly(methyl methacrylate) double- and triple-skin sheets. Test methods Ingestion-build-47934 BS EN 13491:2018 supersedes BS1 Scope This International Standard specifies the test methods for quality control of poly(methyl methacrylate) (PMMA) extruded double and triple skin flat sheets, obtained from colourless and coloured transparent, translucent and opaque grades of materials as defined in clause 4. The minimum sheet width is 600 mm. The main applications of these sheets are in building and agriculture (greenhouses).