*parts under 25.4mm in diameter may not have beveled edges

Commercial windows used for sight glasses, instrument windows, beamsplitter substrates, vacuum windows, welding window substrates. Esco carries inventory of square commercial optical windows made from G1 Commercial grade fused quartz. The G1 coding refers to the Striae (per MIL-G-174A) C-D, Index Variation ∆n(x10^-6) 20.

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