AIGI 30
A solid metal gasket that is softer than the mating flange material that is virtually 'crushed' into the flange
face, creating a seal by filling imperfections and leak paths with gasket material. Under high sealing stress the
gasket deforms but not the flange. They are used predominantly in the petrochemical industry (offshore oil
platforms, refineries) due to the high service pressures required in their processes. Ring joint gaskets are
machined to exact specifications and tight tolerances and come in a number of styles.
Hardness of Materials
On compression of the flange assembly, it is
imperative that the ring joint gasket be
significantly softer than the flange groove so
that the gasket plastically deforms and not the
groove. The use of harder ring joint gaskets can
result in flange groove damage.
For this reason, ring joint gaskets are supplied
with the following maximum hardness values:
Certified at API 6A-1069
