UV Grade Fused Silica (Corning 0F 7980 HPFS) Size: 50.8 (+/- 0.20) mm in dia x 0.5 (+/- 0.10) mm Edge: CNC Ground Surface Quality: 60/40 or better Non-effective Area: 2.0 mm border TTV: < 20 microns Polishing: Two sides polished (60/40) Average Surface Roughness Ra: =< 5 A RMS For the data of Corning 0F 7980HPFS, please click here. Related products: Other Fused Silica Substrates: BK7 Glass FTO Glass ITO Coated Glass