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Rubber and Plastics Glossary

Abrasion: term describes the surface loss of material due to frictional forces.

Abrasion Resistance: describes a material’s resistance to abrasion.

Absorption: The physical mechanism by which one substance takes up another substance (liquid, gas or vapor) into its interior.

Accelerated Aging: Tests run on various rubber materials in order to test the destructiveness of oxygen, heat, light and ozone in a short period of time.

Adhere: To cling or stick together.

Adhesion: The tendency of rubber to bond or cling to a contact surface of another object or surface.

Aging: To undergo changes in physical properties over the course of time.

Ambient Temperature: The surrounding temperature experienced by a specific application.

Bleeding: Migration to the surface of plasticizers, waxes or similar materials, to form a film or bead.

Blister: 1. cavity or sac that deforms the surface of a material. 2. A raised spot in the surface, or a separation between layers, usually forming void or air‐filled space in the profile.

Bloom: A dusty or milky looking deposit that sometimes appears on the surface of a molded product after molding and storage, caused by migration of liquid or solid to the surface. Not to be confused with dust from external sources.

Bond: The term commonly used to denote the attachment of a given Elastomer some other member. Bonds may be classified by types, as mechanical, cold and vulcanized.

Brittleness: The tendency of a material to crack when deformed.

BunaN: See nitrile.

BunaS: A general term for the copolymers of butadiene and styrene. Also known as SBR and GRS.

Butt Joint: Joining two ends of a seal whereby the junction is perpendicular to the mold parting line.

Cell: A single self-contained walled cavity.

Closed Cell: A cell totally enclosed by its walls and hence not interconnecting with other cells.

Coefficient of Thermal Expansion: The average expansion per degree over a stated temperature range, expressed as a fraction of initial dimension. This may be stated as linear or volumetric.

Cold Resistance: A materials ability to withstand the effects of cold or low temperatures.

Collapse ‐ inadvertent densification of a cellular material during the manufacturing process, which can result in breakdowns of the cellular structure.

Compound: A term applied to a mixture of polymers and other ingredients.

Compression Deflections: A term to describe the PSI needed to compress a slab to a specified percentage of its overall height. This is usually 25%.

Compression Set: The amount by which a rubber specimen fails to return to its original shape after release of a compressive load.

Conductive Rubber: A rubber capable of conducting electricity.

Copolymer: A polymer consisting of two different monomers chemically combined.

Cracking: The sharp break or fissure in the surface. Generally due to excessive strain.

Crazing: A surface effect on rubber articles characterized by many minute cracks.

Cure: the act of vulcanization.

Durometer Hardness ‐ a numbering scale that indicates theresistance to indenter point of the durometer.

High values indicate harder materials.

Durometer: (a) An instrument for measuring the hardness of a rubber; measures the resistance to the penetration of an indenter point into the surface of the rubber; (b) numerical scale of rubber hardness.

Elasticity: The property of an article that tends to return to its original shape after deformation.

Elastomer: Any natural or synthetic material with resilience or memory sufficient to return to its original shape after major of minor distortion.

Elongation: Generally means “ultimate elongation”, or percent increase in original length of a specimen when it breaks.

EPDM: Ethylene‐Propylene‐Diene Monomer is well known for its excellent ozone,weathering, and aging resistance. It also has excellent water and steam resistance, maintains its flexibility at low temperatures, features excellent resistance to alkalis, acids, and oxygenated solvents, and is very color stable. It has low resistance to oil, gasoline and other hydrocarbon solvents. resistance to oil, gasoline, and hydrocarbon solvents. EPDM is excellent for use outdoors.

Expanded Rubber ‐ Cellular Rubber having closed cells made from a solid rubber compound.

Extrusion: Distortion or flow, under pressure, of a portion of a seal into clearance between mating parts.

Feather Edge: Or sometimes referred to as knife edge, is the sharp thin edge on parts such as wiper seals and cups.

Flame Resistance: The resistance to burning of a material that will not withstand combustion under ordinary conditions.

Friction: Resistance to motion due to contact of surfaces.

Gasket: A part used to retain fluids under pressure, or seal out foreign matter.

Hardness: Resistance to a disturbing force. Measured by the relative resistance of a material to an indenter point of

any one of a number of standard hardness testing instruments such as a durometer.

Heat Aging: A test for degradation of physical properties as a result of exposure to high temperature conditions.

Memory: The tendency of a material to return to original shape after deformation.

Modulus of Elasticity: One of several measurements of stiffness or resistance to deformation that can be used to indicate specifically static tension modulus.

Modulus: Tensile stress at specific elongation. (Usually 100% elongation for Elastomers).

Mooney Scorch: The measurement of the rate at which a rubber compound will cure set up by means of the Mooney Viscometer test instrument.

Mooney Viscosity: Measurement of the plasticity or viscosity of an uncompounded, or compounded vulcanized, elastomer seal material by means of the Mooney Shearing Disk Viscometer.

Neoprene: Neoprene is a material that has moderate resistance to gasoline and oil. It has good flame resistance and weathers well. Other characteristics include good resistance to flex cracking, abrasion, alkalis and acids. It has poor resistance to aromatic and oxygenated solvents and has limited flexibility at low temperatures.

Nitrile: Nitrile has very good oil and gasoline resistance, permeability, and heat and abrasion resistance. Its resistance to alkalis and acids all increase as the nitrile content of the compound increases. Nitrile must be specially compounded for resistance to ozone, sunlight and natural aging, and has poor resistance to oxygenated solvents. Nitrile is superior to neoprene in oils and solvent resistance, but is not recommended for applications where it is exposed to severe weathering.

Oil Resistant: Ability of a vulcanized rubber to resist the swelling and deteriorating effects of various types of oils.

Open Cell: enclosed by its walls and hence interconnecting with other cells.

Ozone Cracking ‐ the surface cracks, checks or crazing caused by exposure to an atmosphere containing ozone.

Ozone Cracking: The surface cracks, checks or crazing caused by exposure to an atmosphere containing ozone.

Ozone Resistance: Ability to withstand the deteriorating effects of ozone (which generally causes cracking).

Polymer: A material formed by joining together many (poly) individual units of one or more monomers; synonymous with elastomer.

Porosity: Quality or state of being porous.

Post Cure ‐ heat or radiation treatment to which a cured or partially cured rubber is subjected to enhance one or more properties.

Rebound:The measure of the resilience, usually as the percentage of vertical return of a body that has fallen and bounced.

Rebound: A measure of the resilience, usually as a percentage of vertical return of a body, which has fallen and bounced.

Resilience: Ability of an Elastomer to return to original size and shape after deforming forces are removed.

Rubber: a material that is capable of recovering from large deformations quickly and forcibly, and can be modified to a state in which it is essentially insoluble. In boiling solvent such as benzene, methyl ethyl, ketone and ethanol-tulene isotope.

Rubber, Synthetic: Manufactured of man‐made elastomer.

Rubber: A synonym for elastomer.

SBR: Copolymer of Butadiene and Styrene; an all purpose type synthetic, similar to natural rubber. (Butadiene is a gaseous material of petroleum; Styrene, a reaction product of ethylene and benzene)

Scorching: Premature curing or setting up of a raw compound during processing.

Set: The strain remaining after complete release of the load producing a deformation.

Shore Hardness: It is the same as durometer hardness.

Silicone: Silicone features excellent resistance to ozone, sunlight and oxidation, and is very color stable. It also maintains excellent flexibility at low temperatures, has outstanding resistance to high heat, low compression set, and is a very good electrical insulator. However, it is not recommended for applications, which require abrasion resistance, tear and cut growth resistance, and high tensile strength. Nor is it recommended for resistance to oil, gasoline, solvents, alkalis, and acids.

Specific Gravity: Ratio of the weight of a given substance, to the weight of an equal volume of water, at any specific temperature.

Sponge Rubber ‐ cellular rubber consisting predominantly of open cells made from a solid rubber compound.

Tear Resistance: Resistance to growth of a cut or nick when tension is applied to the cut specimen. Commonly expressed as pounds per square inch thickness.

Tear Strength: The maximum load required to tear apart a specified specimen,the load acting substantially parallel to the major axis of the test specimen.

Temperature Range: Maximum and minimum temperature limits in which a seal compound will function in given application.

Tensile Strength: The force in pounds per square inch that is required to rupture a specimen of rubber material.

Viscosity: The property of fluids and plastic solids by which they resist an instantaneous change of shape, i.e. resistance to flow.

Vulcanization: The irreversible process during which a rubber compound through a change in its chemical structure. After vulcanization, the material becomes less plastic and resistant to swelling.


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