Wafer Fused Silica Ø76.2mm Ep.0.5mm flat
Material : Corning 7980 UV Grade Fused Silica equivalent to 2G quality,
Dimensions : 76.2mm +/- .2mm diameter x .5mm +/- .025mm thick
3'' +/-.00787'' diameter x .0197'' +/- .00098'' thick,
With reference flat measuring 22.225mm +/- 3.175mm (=.875'' +/- .125'') long