Polyester

(mylar) low melting point plastic film used for cheap flexible circuits.

Polyester

Polarization

 A technique of eliminating symmetry within a plane so that parts can be engaged in only one way in ...

Polarization

Poise

A centimeter-gram-second unit of viscosity equal to that of a fluid requiring a shearing force of one dyne to&...

Poise

Plotting

The practice of mechanically converting X - Y position information into a visual pattern, such as artwork.

Plotting

Plating

A uniform coating of conductive metal upon the base material of the printed circuit board.

Plating

Plating Up

The process consisting of the electrochemical deposition of a conductive material on the base material (surface holes, etc.) after the base material has been made conductive.

Plating Up

Plating Resists

Materials which, when deposited on conductive areas, prevent the plating of the covered areas. Resists are available both as screened-on materials and as dry-film photopolymer resists.

Plating Resists

Plating Bar

The temporary conductive path interconnecting areas of a printed board to be electroplated, usually located on the panel outside the borders of such a board.

Plating Bar

Plated Through-hole

A hole with the deposition of metal (usually copper) on its sides to provide electrical connections between internal or external conductive patterns.

Plated Through-hole

Plate Finish

Pertaining to Laminating. The finish present on the metallic surface of metal clad base material resulting from direct contact with the laminating press plates without modification by any subsequent f...

Plate Finish

Pitting

Small holes or sharp edges on the surface of a solder joint generally caused by flux entrapment, oxidation or over-heating.

Pitting

Pit

A depression in the conductive layer that does not penetrate entirely through it.

Pit

Pink Ring

Chemically-induced fracturing or de-lamination on or below the surface of the base material; it is usually exhibited by a light area around holes, other etched areas or both.

Pink Ring

Pinholes

Small imperfection which penetrate entirely through the conductor and/or solder.

Pinholes

Pinhole

A minute hole through a layer of pattern.

Pinhole

Pin

A terminal on a component. A component lead that is not readily formable without being damaged.

Pin

Pin Density

The quantity of pins on a printed board per unit area.

Pin Density

Pilot Hole

See Locating Hole.

Pilot Hole

PIH Assembly

Pin-in-hole a printed board assembly made up of components with leads which pass through holes in the board and lands. Synonyms: traditional assembly, conventional assembly.

PIH Assembly

Pick-and-place Machine

A programmable machine usually with a robot arm for picking components from a feeder. It moves the part for placement and/or insertion to a specific site on the board.

Pick-and-place Machine

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