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.
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- Hot Tack
- A characteristic of hot melts in that they have holding power even while in the
liquid hot state.
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- Hydrolysis
- Decomposition of a substrate by reaction with water.
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- Hygroscopic
- Capable of absorbing and retaining environmental moisture.
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I
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J
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M
- Mechanical Adhesion
- Adhesion between surfaces in which the adhesive holds the parts together by
interlocking action.
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- Migration
- Migration of adhesives from the interior to the surface of a plastic.
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- 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.
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- Polymide Resin
- A polymer in which the structural units are linked by amide grouping.
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- Polyester Resin
- A polymer in which the structural units are linked by ester grouping.
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- Polymer
- A chemical compound or mixture of componds formed by polymerization.
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- 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].
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- 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.
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- 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.
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- Thermoplastic
- A material capable of being repeatedly softened by heat and hardened by cooling.
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- 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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