An assembly consists of two identical flanges, a clamp, and a centering ring to align the flanges and prevent the O-ring from collapsing. Since the clamp is typically a thumbscrew, no tools are needed. The system is ideal for small diameter tubing that needs frequent reassembly. Stainless steel fittings are used for adverse temperature and corrosion conditions, and aluminum or brass fittings for more general applications. Some fittings are made of a reinforced polycarbonate plastic and are economic and suitable for pressures down to 1 x 10-4 Torr.
Some experts advise greasing the O-ring before assembly.
Silicone O-rings are rated usable at 200 C for long periods, but silicone hardens and sticks firmly to the flange surfaces. Viton is a registered trademark of DuPont Dow Elastomers. Copyright 2000 Cahners Business Information , A Division of Reed Elsevier, Inc . Privacy Policy .