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Model Engineering Glossary: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Adhesive Terminology

Adhesion

The state in which two surfaces are held together by interfacial forces which may consist of valence forces or interlocking action.


Adhesion, Mechanical

Adhesion between surfaces in which the adhesive holds the parts together by interlocking action.


Adhesive Specific

Adhesion between surfaces which are held together by valence forces or molecular bonding.


Adhesive

A substance capable of holding material together by surface attachment.


Adhesive Failure

Failure resulting from insufficient bond between the adhesive and one or both sustrates. Adhesive strips away from substrates.


Adhesive Tensile

An adhesive is in tensile loading when the acting forces are applied at right angles to the plane of the adhesive. The tensile strength of a bond is the maximum tensile load per unit area, required to break the bond expressed in pounds per square inch.


Amorphous Phase

Non-crystalline. Most plastics are amorphous at processing temperature. Many retain this strength under normal temps.


Antioxidants

Compounds that retard the rate of oxidation of a polymer.


Base Monomer

The purified liquid adhesive before any stabilizers or thickening agents are added to it.


Cohesive Failure

Occurs when internal strength of the adhesive is not as great as the forces applied to it. Adhesive remains bonded to both sustrates.


Crystallinity

A state of molecular structure in some polymers denoting uniformity and compactness of the molecular chains.


Degradation

Deleterious change in the chemical structure of a plastic reflected in its appearance or physical properties.


Dielectric Constant

That property of a dielectric which determines the electrostatic energy per unit volume for unit potential grade.


Dielectric Sterength

The voltage at which an insulating material can withstand before breaking down occurs, usually expressed as volts per mil.


Dissipation Factor

The tangent of the loss angle of the insulating material.


Elongation

The fractional increase in length of a material stressed in tension.


Encapsulating/Potting

Enclosing an article in an envelope of adhesive.


EVA (Ethyline Vinyl Acetate Resins)

Co-polymers of the polyolefins family derived from random co-polymerization of acetate and ethylene.


Exudation

Migration of adhesives from the interior to the surface of plastic.


Film Tension

The greatest longitudinal stress a cast film (125 mils thickness) can bear without tearing apart.


Fractional Distillation

A purification process where the raw monomer is heated to a precise, temperature controlled, constant boiling mixture. Then the vapor (gas) from this boiling mixture is cooled and transfered to the distillation column at an exact, specific temperature. The purpose is to remove any chemical impurities from the monomer.


Heat Resistance

The temperature at which a bond subjected to a PSI load fails.


Hot Tack

A characteristic of hot melts in that they have holding power even while in the liquid hot state.


Hydrolysis

Decomposition of a substrate by reaction with water.


Hygroscopic

Capable of absorbing and retaining environmental moisture.


Mechanical Adhesion

Adhesion between surfaces in which the adhesive holds the parts together by interlocking action.


Migration

Migration of adhesives from the interior to the surface of a plastic.


Molecular Weight

The sum of the atomic weight of all atoms in a molecule.


Monomer

The uncured liquid adhesive.


Penetration

The entering of an adhesive into a substrate.


Polyester Resin

A polymer in which the structural units are linked by ester grouping.


Polymer

A chemical compound or mixture of componds formed by polymerization.


Polymerization

A chemical reaction in which two or more small molecules continue to form larger molecules that contain repeating structural units of the original molecules. [Reproduction of parts].


Polymide Resin

A polymer in which the structural units are linked by amide grouping.


Potting

Enclosing and article in an envelope of adhesive.


Resistivity

The ability of a material to resist passage of electrical current either through its bulk or surface.


Shear tensile

An adhesive is in tensile loading when the acting forces are applied parallel to the plane of the adhesive. The tensile strength of an adhesive bond is the maximum tensile load per unit area required to break the bond. Expressed in pounds per square inch.


Specific Gravity

The density (mass per unit volume) of any material divided by that of watwerter at a standard temperature ; specific gravity of water= 1:00.


Thermal Conductivity

Ability of a material to conduct heat.


Thermoplastic

A material capable of being repeatedly softened by heat and hardened by cooling.


Thermoset

A material which will undergoe a chemical reaction by action of heat, catalysts etc.. Leading to a relatively infusible state.


Viscosity

The measure of the resistance of a fluid to flow usually expressed in poise (or centipoise). A higher reading indicates thicker material.



Model Engineering Glossary: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z