GLOSSARY OF TERMS
E

E-Glass: a family of glasses with a calcium alumina borosilicate composition and a maximum alkali content of 2.0%. Originally formulated for use in electric circuitry.

Elasticity: that property of materials by virtue of which they tend to recover their original size and shape after removal of a force causing deformation.

Elastic limit: the greatest stress a material is capable of sustaining without permanent strain remaining after the complete release of the stress. A material is said to have passed its elastic limit when the load is sufficient to initiate plastic, or nonrecoverable, deformation.

Elastomer: a material that substantially recovers its original shape and size at room temperature after removal of a deforming force.

Elongation at break: standard measure for the amount a sample can stretch as a percentage of original length before it fails or breaks.

Encapsulating: completely surrounding an object with resin or a fiber resin composite. Sometimes used specifically in reference to the enclosure of capacitors or circuit board modules.

End: a strand of roving consisting of a given number of filaments gathered together. The group of filaments is considered an “end” or strand before twisting, a “yarn” after twist has been applied. An individual warp yarn, thread, fiber, or roving.

End count: an exact number of ends supplied on a ball of roving.

Environment: the aggregate of all conditions (such as contamination, temperature, humidity, radiation, magnetic and electric fields, shock, and vibration) that externally influence the performance of an item.

Epoxy: a polymerizable thermoset polymer containing one or more epoxide groups and curable by reaction with amines, alcohols, phenols, carboxylic acids, acid anhydrides, and mercaptans. An important matrix resin in composites and structural adhesive. Epoxies generally have higher physical properties than polyester resins. They are also more costly and difficult to process, and less able to withstand sunlight. Schmelzer Industries produces epoxy-compatible veils and mats.

Even tension: the process whereby each end of roving is kept in the same degree of tension as the other ends making up the ball of roving.

Exotherm: the liberation or evolution of heat during curing of a plastic product.

Extend: to add fillers or low-cost materials in an economy producing endeavor. To add inert materials to improve void-filling characteristics and reduce crazing.

Extenders: low-cost materials used to dilute or extend high-cost resins without extensive lessening of properties.

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