- Pad : The metal on the surface of a substrate or PWB through which the hole is drilled for a via connection, or the conductor point designed to be a test probe landing area. - Peel-Away Speed : The speed of lifting the stencil from the PCB after printing - Percent Area Coverage : The percentage of footprint area that has been covered by the printing process - Pick & Place : The method of certain placement equipment of picking components (mechanically or by vacuum) from tapes or magazines (etc.) and placing them in the correct position of the PCB. - Pitch : The distance between a feature and the adjacent feature on the same component. - Placement Machine : (Automatic) equipment used to mount components onto a PCB - Plastic flat-pack : A FP with the body made with plastic - PLCC (PCC) : Plastic Leaded Chip Carrier (Plastic Chip Carrier). A plastic IC package for surface mounting applications that has leads, generally "J" leads, on all four sides. - Poise : Unit of viscosity. It is one for a liquid that requires the force of one dyne to be moved from a one square centimeter surface area with velocity of one centimeter per second. - Polymers : A class of chemical whose main feature are the long chains of molecules. Epoxies and other resins are polymers - Preheat : it evaporates the solvent component of the flux (95 to 99% of its action takes place right in the wave). Its main function is to raise the board’s temperature. - Preproduction Test Board : An assembly that is to determine whether a sub-contractor is able to build the product in large runs. - Primer : A first coating that is applied to improve the holding strength of an adhesive - Print Head : That part of a printer that contains all the elements for holding the squeegee - Printed Circuit Board [PCB] : General designation of the support structure of an electronic assembly. Also referred to as a PWB [Printed Wire Board]. It consists essentially of a dielectric material (the substrate) onto which metallic conductors have been applied (etched copper foil and additional plating) to reflect the electronic circuit. - Pyrometer : IR detector to measure the temperature of the board