DIY Investment: FB Home Foundry Metal Casting
Bruce Tremain
Plaster and silica, anything from silica flour to sand depending on your application. Not all plasters are equal so if your plaster is softer (which alot is) then add about 5% or so of white Portland cement. You can add a little talc to make it more porous. One thing that I found a bit of a pain but very effective is to get ceramic fiber paper and add some of it to the water and then blend it together, the fibers provide excellent reinforcement against cracking.
Start with 50/ 50. I suspect that it might perform even better if you drop the plaster down a little for higher temperature work.
Plaster and silica, anything from silica flour to sand depending on your application. Not all plasters are equal so if your plaster is softer (which alot is) then add about 5% or so of white Portland cement. You can add a little talc to make it more porous. One thing that I found a bit of a pain but very effective is to get ceramic fiber paper and add some of it to the water and then blend it together, the fibers provide excellent reinforcement against cracking.
Start with 50/ 50. I suspect that it might perform even better if you drop the plaster down a little for higher temperature work.
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