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Elongation (Stretch, Ultimate Elongation)

The distance a tape will stretch in the machine or cross direction before breaking under controlled conditions, expressed as a percentage of original length.   Elongation is not necessarily an indication of conformability.

Electrolyte Corrosion Factor

A measure of the tape's corrosive effect on an electrical conductor, particularly copper.   This is particularly important in the selection of tapes for electrical insulation.

Elastomer

An elastic, polymeric substaance, such as natural or synthetic rubber.

Elasticity

The extensible property of adhesive films or adhesive interfaces to contract and expand in such a manner as to overcome the differential contraction and expansion rates that the bonded adherends may exhibit.

Edge Lift

The tendency for the edge of an adhesive label to lift from a surface to which it has been adhered.

Edge Curl

The peeling back or lifting of the outer edge of an applied tape in a curved manner.

Double-Coated

An adhesive application to both sides of a backing.

Dimensional Stability

That property of a material that relates to the constancy of its dimensions, particularly in relation to external influences such as moisture or temperature.

Dielectric Strength

The measure of the maximum voltage stress that a single layer of tape can withstand before dielectric failure occurs, the test being carried out under prescribed conditions.

Delamination

A separation or splitting of the tape such as the separation of the backing into two distinct layers, separation between laminations of a tape consisting of more than one backing, separation between filaments and backing of a filament-reinforced tape, or separation of the adhesive from the backing.

Curl

The tendency of paper by itself or in a laminate to bend or partly wrap around the axis of one of its dimensions.

Cure

To alter the properties of an adhesive by chemical reaction, which may be condensation, polymerization, or vulcanization.   Usually accomplished by the action of heat and catalysts, alone or in combination, with or without pressure.

Cross-Linking

Developing a three-dimensional molecular structure in an adhesive normally activated by heat or irradiation.  An improvement in shear resistance, high temperature resistance, and oil or solvent resistance will normally result.

Creep

The slow movement of the adhesive or backing under shear stress.

Color Stability

The ability of a tape to retain its original color, particularly when exposed to light.

Cold Flow

The tendency of a pressure sensitive adhesive to act as a heavy viscous liquid over long  periods of time.  Such phenomena as oozing and increase in adhesion with time are the result of this characteristic.

Cohesion (Cohesive Strength, Internal Bond)

The ability of the adhesive to resist shear stress and splitting.   Good cohesion is necessary for clean removal.

Coating Weight

The weight of coating per unit area.   In SI-units expressed as grams/square meter. 

Carrier

A webstock that holds a pressure-sensitive adhesive, especially used to refer to double-faced or double-coated tapes.

Caliper

The thickness (as of a sheet of paper) measured under specific conditions.