Patent ID: 7093746

Claim:
A method for printing solder paste on a conductive pad of a printed wiring board, the method comprising: providing a printed wiring board having at least one conductive contact pad having a surface suitable for adhesion of solder paste to provide a physical and electrical coupling between the printed wiring board and an electronic component; providing a stencil having a board side and a fill side, the stencil including interior surfaces that define at least one aperture extending from the board side to the fill side, the cross-section of the aperture at the board side having a profile that fits within the profile of the surface of the contact pad, the interior surfaces of the stencil that define the aperture(s) being coated with a material selected from parylene and its homologues; placing the board side of the stencil in contact with the printed wiring board and aligning the aperture with the contact pad of the printed wiring board; and printing solder paste, in paste form, through the aperture and onto the contact pad, the solder paste adhering to the contact pad.