Chemically Compatible


To be considered corrosion resistant or chemically compatible the selected material must corrode at a rate of less than 0.002 inches per year (0,05 mm/year).

This definition causes a problem in the selection of the metal foil material used in the manufacture of welded metal bellows for mechanical seals. The foil used in these seals is about 0.004 inches (0,1 mm) thick.

These thin foil sections are needed to keep the spring rate of the resultant bellows low enough to create the proper closing force on the bellows seal faces.