... less than 2 defectsAdditional NotesThe surface defect allowance is for each sheet.For sheets without edge cutting, defects ... from the edge can be ignored. For Grade A sheet, total number of defects should not ... light collecting cover, skylight, ship glass, glass cover, for daily necessities. windshield, mechanical cover, handmake acticle, ... on. SGS Testing result Cast acrylic solid surface sheet/PMMA