These Glass Replacement viewports fit our CF1.33 Demountable Viewports. View diameter of 0.56". Glass Thickness 0.159," No Coating, Max Bake Temperature: 150°C, Operating Wavelength: 350nm~1500nm. Accu-Sol glass is an economical replacement for Corning type 7056 glass. This high transmission glass has a 90% transmission from 350 to 2100 nm wavelength range and greater than a 80% transmission from 2100 to 2680 nm wavelength range. Removal of the glass is possible if one wants to apply optical coatings. A Replacement Quartz Fused Silica Glass is also offered for selected transmission wavelength ranges.