This large-format optical wafer is manufactured from Borofloat® glass, offering excellent thermal stability and optical performance in a 200.00 mm ± 0.20 mm diameter form with a thickness of 2.0 mm (tolerance −0.10 mm). With a clear aperture of 190 mm, it provides a generous usable area for precision optical systems. The transmitted and reflective wavefront errors are both ≤ 1 wave per inch (at the metrology wavelength of 632.8 nm), ensuring minimal distortion. Parallelism is held to ≤ 5 arc seconds per inch. The wafer’s edges are beveled (0.2-0.4 mm full width, 45° angle) for safe handling, and surface cosmetics are 60/40 scratch-dig standard. Roughness is the standard grade.