Copper, mask and paste define different thingsCopper, solder-mask and paste data should be reviewed together while retaining their separate functions.Copper, mask and paste define different thingsExploded conceptual layers; openings are intentionally independentPaste aperture: deposited solder volumeMask opening: exposed surfaceCopper pad: electrical connectionBoard dielectric: support / insulationChanging a mask opening does not automatically change the copper pad or paste aperture.³Ô¹Ïtv · Engineering explanation · Conceptual, not to scale