Back Rind
Distortion of the mold parting line, usually in the form of a ragged or torn indentation
Backup ring
A washer-like device of a relatively hard, tough material installed in the gland on the downstream side of the seal to prevent seal extrusion into the diametrical gap while under pressure
Backup washer
A washer made from certain material that will add strength or support when installed next to the seal. This prevents the seal from being pinched and evenly distributes the load
Base Line
The mark from which all features are dimensioned
Batch Control
A process of keeping separate a batch of a rubber compound from the time it is molded through the entire production process up to and including the Shipping Department
Batch Number
The assigned number that identifies a batch or rubber
Billet
A term used (primarily in the Rubber Mold Industry) to describe mold cavity or core inserts which can easily be replaced in production molds
Blisters
A raised spot on the seal's surface created by an internal void, or air-filled pocket
Bloom
A milky surface discoloration caused by the migration of certain compound components (such as antiozonants) to the rubber's surface after molding or storage. The waxy film serves as a protective coating shielding the part from oxidation. This discoloration DOES NOT adversely affect material performance
Bond
The mechanical or chemical force that holds an elastomer to some other object. Mechanical bonding includes component interference and no molecular cross-bridging between the elastomer and substrate, whereas chemical bonding involves contact adhesives with heat and pressure to adhere an elastomer to a primed surface
Bonding
The method of securing molded rubber directly to an insert. There are two types; A. Mechanical, where the insert is designed with ribs, grooves or holes which enable the adhesive action with rubber when molded around the insert. B. Chemical, where the insert is treated with a point that has an adhesive action with rubber when molded around the insert
Bore
A hole machined in a component which permits the passage of a shaft
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