I've spoken with a number of Engineers about this subject and there didn't seem to be a consensus number. In my own experience, I found that we were replacing the stencils after approximately 30,000 print strokes. In my predictive maintenance spreadsheet, I prompt a stencil replacement when the stencil is within 5% of it's useable life left, and I set that usable life at 25,000 print strokes.
Well the stencil in question have shield components. And this stencil sometimes doesn't even reach 10,000 strokes.As compared with stencil that does not have shield components, the life span seems to be lesser considering that same squeegee, print pressure and speed is being used. I am trying to figure out the predictive maintenance for this type of stencil.thanks