This EVAC Chain Clamp for NW16 KF16 flanges is for converting Elastomer (Viton/Buna) rubber seals to UHV (Ultra High Vacuum) metal seals. This allows for a lower vacuum compared to elastomer (Viton/Buna) rubber seals. Other benefits include: reduced outgassing, no permeation , no hydrocarbons, and resistance to radiation and higher heat. The resultant UHV seal has a helium leak rate of of less than 1 X 10 -11 standard cc/sec. They can also be baked repeatedly to 150°C (302°F). The EVAC chain clamp and an aluminum knife edge seal form the UHV vacuum seal between the connecting KF flanges.

This is a uncoated version that is the preferred choice for sealing standard KF flanges with aluminum metal seals. This chain clamp has aluminum links. This is a KF16 NW16 chain clamp only.