Material   Fused Silica    Flatness   Lambda/4 at 633 nm per inch   Scratch-Dig   40 - 20   Size tolerance   ± 0.1 mm   Parallelism   less than 3 arc minutes   Clear aperture   90 %   Bevels   (0.2-0.5)mm x 45°
Diameter, mm Thickness, mm Part Number 12.7 2 W8-05 25.4 3 W8-10 38.1 4 W8-15 50.8 6 W8-20 76.2 8 W8-30 101.6 12 W8-40 Sizes up to 400 mm diameter x 40 mm thickness are available by special order.

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