"This PAS provides the requirements for the single- and double-sided flexible printed wiring boards (hereinafter designated as ""flexible printed board"" or FPC). In this document@ an FPC means a single- or double-sided FPC prepared by lamination of a film of polyester or polyimide with copper foil(s) on one or both sides of a board including the type with no adhesive layer@ and with conductor pattern formed by the subtractive method (etching of the copper foil)@ or possibly by the build-up method."