Quad Twist or Phantom Twist -- The twist by which the two twisted pairs are combined to form the quad.

Quad Type -- Designation applied to quads have different lengths of twist to facilitate lay-up in the core and to reduce crosstalk.

Quad-Rated Wire -- ITT name for 90°C and 105°C wire which replaces four other types of wire: 60°C TW 600V; 90°C MTW 600V; 90°C AWM 1000V; and 105°C AWM 600V.

Quadders -- Three-bay machines which can twist four wires together. They can be cable braided and shielded wires with varying lay lengths.

Qualified Products List -- A QPL source of supply is a manufacturer that has been registered by the U.S. Government and issued a QPL number as a qualified producer of a given commodity. There are, however, other manufacturers who produce identical products, equal or better in quality and performance, but because unregistered, sell the product at a lower price.

Quench (Thermoplastics) -- A process of shock cooling thermoplastic materials from the molten state.