Electropolished Stencil

Foil Modification

Acidic chemical baths combined with electrical current selectively dissolve surface peaks along the stainless steel foil. This erosion reduces the surface roughness of the aperture walls from a typical laser-cut value of several micrometers to a sub-micron finish. Solder paste flows more easily through these polished openings, lowering the minimum area ratio requirement for fine-pitch components.

Printing Stability

Print consistency improves over long production runs because the smooth metal surfaces resist paste buildup and clog less frequently. An electropolished stencil reduces the required cleaning frequency from every three boards to every ten boards or more. This reduction in wipe cycles extends the lifespan of the squeegee blades and decreases solvent consumption.

Low-pressure wash cycles remain effective for longer periods, maintaining high yield without manual intervention. Fabricators rely on this technology when assembly designs demand sub-0.4 millimeter lead pitches or tiny passive parts.