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Surface wear caused by relative motion between contacting objects

Abrasion Resistance
The ability of a rubber compound to resist surface wearing by mechanical action


A chemical compound that speeds up the vulcanization of natural or synthetic rubbers

Adhering Flash
Extremely thin flash (usually less than .002' thick) that adheres to the finished part during molding or deflashing processes

Age Protection - Active
the use of a chemical additive in a rubber compound which is preferentially attached by oxygen or ozone thereby sacrificially protecting the rubber

Age Protection - Passive
The use of a chemical additive in a rubber that will migrate to the surface of a rubber part to form a protective physical barrier

The change in physical and chemical characteristics of an elastomer that has been exposed to a particular environment over time

A composite material produced by blending polymers or copolymers with other polymers under selected conditions to achieve greater physical properties

Ambient Temperature
The temperature of the environment surrounding a particular object

Aniline Point
The lowest temperature at which equal parts of aniline and a test liquid (such as oil) will uniformly mix or blend. The aniline point of oil is a measure of aromaticity (the amount of unsaturated hydrocarbons present). The lower the aniline point, the more unsaturants are present and the higher the potential for swelling certain rubber compounds

A process of holding a material at a temperature near, but below, its melting point, to permit stress relaxation without distortion of shape. Often used on molded article to relieve stresses set up by flow into the mold

Any organic compound that slows the process of oxidation

Any substance that slows the severe oxidizing effect of ozone on elastomers. Exposure to ozone typically causes surface cracking in many rubbers

Accepted quality level

A major group of unsaturated cyclic hydrocarbons containing one or more rings. A typical aromatic compound is benzene, which has a six carbon ring, containing three double bonds


American Society for Testing Materials

American Society for Testing and Materials, An organization for issuing standard specifications on materials, including metals and alloys

The change in physical and chemical characteristics of a rubber compound that has been exposed to a particular environment over time

Axial Seal
Squeezed, like a gasket, on both the top and bottom surfaces of the seal's cross section. A face seal

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

A term used (primarily in the Rubber Mold Industry) to describe mold cavity or core inserts which can easily be replaced in production molds

A raised spot on the seal's surface created by an internal void, or air-filled pocket

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