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opticalwindows are ideal for applications where high pressure, vacuum, or corrosive atmospheres are a consideration · Extremely hard and durable material.· Ideal for thermally demanding environments.Sapphire window are scratch resistant and have broad transmission range from the UV to the NIR. in both round and rectangular size with a standard parallelism of 1 arc MinuteSapphire is single crystal aluminum oxide(Al2O3) and because of its structure strength, sapphire windows can be made much thinner than othersMaterial optical sapphire (Al2O3)Surface FlatnessClear Aperture90%Parallelism3 arc minDimensions Tolerance+0.0/-0.05mmThickness Tolerance+/-0.1mmBevel<0.25mm 45Surface Quality60-40 scratch-dig