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The Book of Terms

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.

   

 

All   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

IRE

Abbreviation for former Institute of Radio Engineers. See IEEE.

Iridium

Element, chemical symbol Ir. A yellowish mineral with the most corrosion resistance of any metal known.

Iridium Wire

Sintered or cast iridium has working characteristics similar to those of tungsten. Thoriated iridium wire also has improved mechanical proper­ties. Platinum-iridium wire coupled with pure platinum is used in thermocouples.

IRK

A system to classify materials according to their resistance on a 304.8 m (1,000 ft) basis at 15.5°C (60°F).

Iron

In the steel industry, iron is the name of a product of a blast furnace containing 92 to 94 percent iron. Other names for blast furnace iron are pig iron and hot metal. A magnetic, silver-white metal of high tensile strength, ductility and malleability. Principal commercial forms are steel, cast iron or wrought iron.

Iron Hydroxide

A chemical formulated with water and iron and found in various reactions around the applications involving iron. 1) A neutralization step in treating pickling acids, 2) A slimy film on wire caused by wet condition of the wire. Con­stitutes the dull coat formed on wire to facilitate drawing by providing a base to which the lubricant or lubricant carrier attaches firmly.

Iron Scrap

Blast furnace metal or other iron that may be salvaged by re-melting in a blast furnace or in a electric furnace.

Iron-Based Super Alloys

Also known as super chrome steels, these metals are at the highest end of the range of high temperature, high strength steels. Besides chrome, other additives can be nickel, titanium, manganese, molybdenum, vanadium, silicon and carbon.

Iron-Constantan

A combination of metals used in thermocouple wires and thermocouple lead wires. The iron wire is positive, the constantan negative.

Irradiated Polyolefin

A dielectric compound that has been exposed to electron beam radiation.

Irradiation

The exposure of a material to high-energy emissions. In insulations for the purpose of favorably altering the molecular structure.

ISO

International Organization for Standardization that develops and publishes international standards for manufacturing and measuring systems.

Isolation Transformer

See Transformer, Safety Isolation.

Isothermal Extrusion

Technique of providing uniform temperature during an extrusion process. An initial temperature gradient may be imposed upon the billet, and the ram speed may be varied.

Isothermal Heat Transformation

Technique of computing heat content for the non-stationary thermal conduction in the continuous casting operation.

Isotope

Atoms of a given element, all having the same number of protons and thus the same atomic number but each having different number of neutrons and thus different atomic weight.

ISWG

Designation for Imperial Standard Wire Gauge. More usually known as Standard Wire Gauge (SWG).

IWRC

Designation for Independent Wire Rope Core. A wire rope used as the core of a larger rope.

Izod Test

A pendulum type of impact test, in which the specimen is supported at one end as a cantilever beam and the energy required to break off the free end is used as a measure of impact strength. A test for resistance to impact by measuring the energy required to break a test piece 1 sq cm (0.155 sq in.) with a notch in it of 2 mm (0.078 in.) depth by striking it with a pendulum hammer from a predetermined distance. The energy required to break off the free end of the sample is a measure of the impact strength or toughness of the material.
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