Bentone is hard to find in small quantities though, it is a chemically modified clay that has been made organophilic (ie. If you can find a source of bentone-34, you could make your own k-bond sand, which is a Petrobond knockoff developed at Kent State University. Some 12 months ago they would only supply Petrobond if I bought a large quantity, like 500Kg. This was the case with Cast Metal Services in SA. That contact was some 12 months ago and the situation maybe different now. China, Yes I did call Resin Sands some time ago and they had not heard of Petrobond or any Oil and bentonite formula casting sand.
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DaveCast Iron 2-Part Sand Casting Flask Mold Frame for Delft Clay and Petrobond Sand Casting for Jewelry Making and Metal Pouring $34.95 Get it as soon as Saturday, Jul 23 FREE Shipping on orders over $25 shipped by Amazon Green sand can make just about any casting you can think of. I lake to add some organic stuff to help hold the water so I ususlly add 1/2 lb of wheat paste. A good formula for green sand is 100 lbs fine sand, 10 lbs bentonite, 10 lbs water.
A good formula for green sand is 100 lbs fine sand, 10 lbs bentonite, 10 lbs water.Shake, or tap, the vessel a few times to get the play sand to fill in any voids around the pattern. Fill the reset of the vessel with play sand until you have a small bit of the sprue exposed. Place a 2" layer of play sand at the bottom of the vessel, and then place the foam pattern on that with sprue pointing up.
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