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Testing Fire Resistance: Alabaster, Putty, Sand, Cement
Yes. It's enough old thing. :) Nevertheless, still works fine.
That gasoline blowtorch is really neat, I've never seen one before!
Aluminum mushroom in my garden :)
Clothes Hook - Aluminum Casting
Testing fire resistance: alabaster, putty, sand, cement
Green Sand Formula - How to Make Molding Sand
Brass Casting - Got Nice Ingot
New Blowpipe - Metal Melting Furnace Upgrade
Brass Casting Heavy Paperweight - Molding and Melting Brass
Thanks for your good advice ChiGuy14. I can say that now I totally satisfied how my green sand works. I used it many times, so it's not bad. Also, I've got some bentonite clay from open-cast mine near my town. I will test it to find out if there is some difference. You can also see how this green sand formula works in my other casting instructables and youtube videos.
Another source for pure bentonite clay is a well drilling company. Ask is you can buy a bag of "driller's mud." It comes in a finely powdered form and is great for use in making green sand. A 30-pound bag will last a long time.
How to Make a Flask for Green Sand Casting
Brass casting heavy paperweight - molding and melting brass
That's good. I do the same. Just throw away very thin layer of green sand which contacted with melted metal. This sand is black, so I think it becomes bad binder.
It's holding up so far. There doesn't appear to be any residue from stuff burning. I just crumble up the mold, mix it back into my supply, and add a bit more water if it's too dry.
That's grate that you have found the solution. At first I thought that I could buy some clay in shops which sold building materials. I was suprised to find out that nobody sold pure clay. :) Does your green sand allows to use it many times. I mean there is nothing left which can just burn during casting?
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