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Product Announcement from Nor-Cal Products, Inc.

Nor-Cal Products offers a complete line of viewports for vacuum chambers with NW, ISO and CF flanges. CF flanged viewports are available with fully annealed 7056 glass or fused quartz. Special materials and coatings, such as sapphire and anti-reflective (AR) coating, are available on request. Glass provides a large distortion free viewing area at low cost. Quartz provides superior ultraviolet radiation transmission and resistance to thermal shock. Glass CF flanged viewports can withstand repeated bakeout cycles to 400°C and vacuum pressures to 10-11 Torr. Quartz CF flanged viewports should not be baked above 200°C. NW and ISO flanged viewports can withstand 200°C bakeouts and pressures to 10-9 Torr.

Weld Stub Viewports

Weld stub viewports are provided with a tube for welding onto an existing chamber. They are available with Viton® O-ring sealed 7056 glass or fused quartz. Maximum bakeout temperature is 200°C.

Zero Length Viewports

Nor-Cal's zero length view ports have an innovative design which places the viewing glass inside the centering ring. The clear, polished quartz can be removed for cleaning or replacement. Zero length view ports are available for NW-40, NW-50 or other ISO-KF compatible flanges of the same size. Also available are 7056 glass viewports in a one-piece assembly. This viewport replaces a blank off cap and uses a standard NW centering ring assembly and clamp for sealing.