UV Grade Fused Silica (Corning 0F 7980 HPFS) Size: 10 (+/- 0.20) mm x 10 (+/- 0.20) mm x 0.5 (+/- 0.05) mm Edge: Hand Seamed Surface Quality: 60/40 or better Clear Aperture: 90% TTV: < 20 microns Polishing: Two sides optical polished Surface Roughness: =< 5 A For the data of Corning 0F 7980 HPFS ,please click here. Related products: Other Fused Silica BK7 Glass FTO Glass ITO Coated Glass