K-Bond, named for Kent State where it was developed by one of
Tom
Cobett's Students, Is an almost smokeless oil bonded foundry sand. It
is used for casting zinc, aluminum, brass, bronze and iron.
The recipe is:
*100 lbs. sand - 100 mesh or finer
*6 lbs. bentone clay (such as Bentone 34 or VG-69)
*3 lbs. synthetic 2 cycle motor oil
*0.2 lbs. (3.2 fluid oz) Methanol (dry gas)
Mixing:
Mix the sand and bentone clay first (wear a dust mask!), then blend in the oil thoroughly. Small batches (less than 10 lb.) can be done by
hand with good results, but a muller is preferred. The small batches
can be done with a cheap kitchen electric mixer.
Add the alcohol and mix thoroughly.
"The sand won't seem like much until the alcohol takes effect and then it will become like stiff cookie dough. How stiff? It bogs down my
muller!
It will be much easier to handle when it is a day old and will get easier to use with time and use.
The sand gets powdery after it sits and it is best to mull it or warm
it before use.
When green strength starts to fade, add in some alcohol."
... Ray
Brandes, quoted from his old web site. Also the source of this recipe.