Sapphire wafer Sapphire substrate(window). ProductSapphire waferSapphire substrate(window)Diameter2", 3", 4",Orientation0001(C-axis), 1012(R-axis) ± 1°, 0.5°, 0.25°, 0.1°Reference Flat Orientation1120(A-axis), 1010(M-axis)Reference Flat Length16±1mm, 22±1mm, 32.5±1mmSecondary Flat Length8±1mm, 11±1mm, 15±1mmThickness330~380um(2"), 430(3"), 435~500um(4") & AdjustableSurfaceOne side polished, Two ...