1) ZnSe Windows:

Material: ..................................................ZnSe
Dimension Tolerance:............................+/-0.1mm
Thickness Tolerance:............................ +/-0.1mm
Surface Accuracy: ........................................λ/4
Surface Quality: .......................................60-40
Parallelism: ..................................................<1'
Clear Aperture: .........................................>90%
Bevelling: ............................................0.2×45°
Coating: .....................................Custom Design