The optic assemblies are TIG welded into the anges and are helium leak tested and cleaned for ultra high vacuum (UHV) conditions. The CF versions are offered using 304L or 316LN stainless steel anges. The rugged construction of the Kodial viewports allows repeated bake-out with UHV performance. The kodial/lead glass window assembly provides visible. Transmission as shown in the graph below.
Transmission Curve – Kodial