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The NW/KF Viewports consist of a one piece assembly. The viewport assembly replaces a blanking plate and uses a standard NW/KF Centering Assembly and Clamp for sealing (not included). The window size for NW16 and NW25 is 16mm (0.62"). For NW40 and NW50, the window has a diameter of 38mm (1.51"). The body is made of stainless steel, the window is made of 7056 borosilicate glass; see transmission curve below. Useful for observing inside vacuum lines or chambers. Temperature range -20°C to 200°C (-4°F to 392°F). Viton® seal. Vacuum range down to 1x10-9 Torr.
Glass Transmission Curve No. 7056 Borosilicate glass, 1mm thick reflection losses included.