Adhesive Glossary of Terms

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


A

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.
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B

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C

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.

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D

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.
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E

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.

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F

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

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H

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.

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I

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J

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K
 
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L
 
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M

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.

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N

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O

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P

Penetration
The entering of an adhesive into a substrate.
 
Polymide Resin
A polymer in which the structural units are linked by amide grouping.
 
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].
 
Potting
Enclosing and article in an envelope of adhesive.
 

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Q

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R

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

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S

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. Epressed 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.

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T

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.

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U

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V

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

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W

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X

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Y

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Z

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