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Tape Glossary | E

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EDGE CURL: Usually refers to the pulling away and folding back of tape along the outer edge of a sharp curve in the applied tape. The edge on the outside of the lifts or folds back due to tension which is highest at this point.
ELASTIC MEMORY: The opposite effect of Dead Stretch. It is the ability of a tape after stretching to shrink to its original strength. This property is especially important for tapes such as vinyl. See "Dead Stretch".
ELETRICAL RESISTIVITY: See "Resistivity".
ELECTROLYTIC CORROSION FACTOR: A measure of the corrosive effect of a tape on a bare copper conductor. It is expressed as a ratio with 1.0 indicating no corrosion under the test conditions, and ratios less than 1.0 signifying degrees of corrosion.
ELASTOMER: Any one of a family if materials, of either natural or synthetic origin, which possesses rubber-like characteristics.
ELONGATION: Degree of stretch, generally expressed as a percentage (increase in length as a percentage of original length). The term is frequently used also as a shorthand way of referring to "Elongation to Break".
ELONGATION TO BREAK: The length that a piece of tape will stretch in one direction before it breaks. Generally expressed in percentage of original length.
ENCAPSULATING: The process of embedding an electrical component in a casting of insulating material.
EPOXY: A class of resinous plastic materials which are frequently used for electrical insulation, in coatings, and in structural uses.
EXTENDER: A substance, generally having a low cost and little effect on the functional characteristics, added to an adhesive to reduce the cost.
EXTUDATION: See "Cold Flow".
EYE: A sample of coated backing from the center of the web at the unwind end of the coater, and used for In-Process testing purposes.

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