Glossary B

Base, Seal
See Face, Outside Seal.

Bedding-In
See Run-in.

Bell Mouth
A condition where the contact between the sealing element and the shaft occurs on the air side of the
seal and not on the seal tip.

Blister
A raised cavity or sack that deforms a surface of the seal material.

Bond
The adhesion established by vulcanization between two cured elastomer surfaces, or between one cured
elastomer surface and one nonelastomer surface.

Bore, Housing
A cylindrical surface that mates with the outside diameter of the outer seal case.

Bore, Seal Case
See Diameter, Outer-Case Inner.

Buna-N
See Nitrile.