This large-format Borofloat® wafer combines excellent optical performance, dimensional stability, and generous clear area in a sleek 1.50 mm thick package. With approximately 85% clear aperture, it delivers a large usable optical surface ideal for demanding applications. Surface cosmetics meet the 40/20 scratch-dig standard, with edges that are fine-edge ground and protected by a safety bevel. Optical flatness is tight: transmitted wavefront error is under 0.25 waves/inch; reflective wavefront error is less than 1 wave/inch. Parallelism is held to better than 30 arc seconds. Total thickness variation (TTV) is < 5 µm. Surface roughness is better than 1 nm RMS, and chips outside the clear aperture are limited to less than 0.5 mm.