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The Book of Terms

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The Book of TermsThe WJI Book of Wire & Cable Terms: an interactive experience of learning and sharing
This book, written by industry volunteers and containing more than 5,000 entries, is an asset for newcomers to wire and cable.

At the same time, it also represents an opportunity for industry veterans to give back by either updating or adding to the more than 5,000 entries. This is an honor system process. Entries/updates must be non-commercial, and any deemed not to be so will be removed. Share your expertise as part of this legacy project to help those who will follow. Purchase a printed copy here.

   

 

0-9   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

FM

Designation for Frequency Modulated.

Foamed Insulation

Insulation made sponge-like using foaming or blowing agents to create the cells.

Foamed Plastics

Resins in flexible or rigid sponge form with the cells closed or interconnected. These foamed insulations provide low dielectric constant and weight savings.

Foaming Agents

Added to pickling baths to produce a foam blanket that reduces acid fumes.

Foamskin

Polyolefin foam insulation with a high-density polyolefin outer skin.

Foamskin Cable

A cable with a foamed polyolefin inner layer covered by a solid polyolefin skin as the conductor insulation.

Foil

A thin, continuous sheet of metal, usually copper or aluminum, in any width, but no more than 0.005 in. thick. Applications include foil for electrical coils as a replacement for copper magnet wire.

Foil Insulation

Shield in the shape of a foil, which is woven over a conductor to assist in overcoming radiation. The foil shield could be a polyester film that is laminated to aluminum foil, creating a tape that offers an excellent metallic shield on one side and an excellent insulator on the opposite side.

Follower

A sleeve used to compress the grommet, thus tightening the seal around wires entering the connector.

Forging

The working of metal to some pre-determined shape by hammering, upsetting, heading, extrusion or pressing (or a combination of these processes). The metal can be hot, warm or cold.

Forging Quality Steel

A special grade of semi-finished steel in the form of blooms, billets, or slabs that is suitable for forging. It must be free of pipe, excessive segregation and injurious surface defects.

Forging Rolls

Rolling mills that produce comparatively uniform shapes by using variable radii around the circumference of rolls that rotate in the opposite direction from those ordinarily used for rolling.

Forging Stock

A wrought rod, bar or other section suitable for subsequent change in cross-section by forging.

Forging Strains

Differential strains that result from forging or from cooling from the forging temperature, and that are accompanied by residual stresses.

Forging, Drop

One of four principal types of commercial forgings. With drop forgings, the shape is formed by repeated blows by a hammer onto a bar or bullet placed between a pair of dies.

Forging, Press

One of four principal types of commercial forgings. With press forgings, hydraulic pressure deforms the metal.

Forging, Roll

One of four principal types of commercial forgings. With roll forgings, the shaping is done by two rotating rolls.

Forging, Upset

One of four principal types of commercial forgings. With upset forgings, the cross-sectional area is in­creased while the thickness (or length) is decreased.
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