"The grain size (AFS GFN) number we suggest for aluminum ranges according to the size and complexity of your casting. In really general working (job shops) we would usually start with a #130 sand. The two most common sizes we make ALUMINUM blends are #115 and #130 (while for IRON they are always much coarser, as in #60 -#80) To this we add 4-5 ingredients, (mostly comprising of a total clay addition in the 4.5% - 7% range to give sand strengths for molding)… then a couple other carbonaceous additives to make casting surface finish as good as possible!"
"other carbonaceous additives" = sea coal and wood flour, based on one guy who just bought the ingredients from them instead of buying it pre-mulled.
See above about possible concerns with using organics though.
Their sand is awesome, that much I know from my own experience.
And their clay is mostly if not entirely calcium bentonite. Ie. Not what's in kitty litter or Quik gel. :(
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