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Tried a different binder ratio on our last sand mold job
Honestly, everyone in our shop swears by the 3% bentonite mix for greensand. Last week on a big gear pattern, I bumped it to 4% thinking it would give us a tougher mold. Ngl, the surface finish was way worse and we got more gas defects. I think the extra binder trapped too much moisture. Has anyone else messed with their binder percentage and had it backfire?
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