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Foamed Plastic - insulations having a cellular structure.

FR-1 - a flammability rating established by Underwrites Laboratories for wires and cables that pass a specially designed vertical flame test. The designation has been replaced by VW-1.

Frequency - The number of times a periodic action occurs in one second. Measured in Hertz.

FREP - Flame retardant ethylene propylene is a special flame retardant version of EPDM rubber. It is designed for use as an industrial control insulation and has excellent electrical characteristics, deformation resistance, and also meets the flame retardant needs of industrial control cables.

FR-TPE - FR-TPE, flame retarded thermoplastic elastomer, is a rubber-like plastic that has properties similar to rubber yet is processed as a thermoplastic. It is used as the insulation and jacket in an all TPE construction which meets UL 13 and 1277 industrial cable requirements. It has good electrical properties, abrasion resistance, colorability and flame retardancy. This compound is ideal for cold weather applications.

Fuse Wire - Wire made from alloy that melts at a relatively low temperature.

Fused Spiral Tape - a PTFE Insulated hookup wire. The spiral wrapped conductor is passed through a sintering oven where overlaps are fused together.