Abrasion
Surface wear caused by relative motion between contacting objects
Abrasion Resistance
The ability of a rubber compound to resist surface wearing by mechanical action
ABS
Acrylonitrile-butadiene-styrene
Accelerator
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
Aging
The change in physical and chemical characteristics of an elastomer that has been exposed to a particular environment over time
Alloy
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
Annealing
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
Antioxidant
Any organic compound that slows the process of oxidation
Antiozonant
Any substance that slows the severe oxidizing effect of ozone on elastomers. Exposure to ozone typically causes surface cracking in many rubbers
AQL
Accepted quality level
Aromatic
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
ASA
Acrylic-styrene-acrylonitrile
ASTM
American Society for Testing Materials
ASTM
American Society for Testing and Materials, An organization for issuing standard specifications on materials, including metals and alloys
Axial
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
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
|
|