timbrigham Posted January 29, 2015 Share Posted January 29, 2015 I'm building a gad forge out of an old air tank. To get the size chamber I want (6 inch diameter x11) I have about 3' of insulation. I'm planning on castible refractory, one of the vermaculite / fireclay blends and eventually adding some itc 1000. It'll need about 1800 cubic inches overall. If I go with a 4:1 vermaculite fireclay blend how much will I need? Im just not familiar enough with the material to know. Quote Link to comment Share on other sites More sharing options...
HDB Posted January 30, 2015 Share Posted January 30, 2015 A: Content big cylinder: 6inch²*Pi*11 = 1243.44inch³ B: Content small cylinder: 3inch²*Pi*11 = 310.86inch³ C: Content insulation:A-B = 932.58inch³ So you would need: 932.58/5 = 186.516inch³ fireclay 932.58/5*4=746.064inch³ vermaculite Of course there's also the addition of water, but this will evaporate. Why not use kaowool? It's more resistent against shock, temperature,... What's the forge for? Forging or smelting,or,... Quote Link to comment Share on other sites More sharing options...
ThomasPowers Posted January 30, 2015 Share Posted January 30, 2015 Unlikely to be smelting but could be melting---very different tasks! Quote Link to comment Share on other sites More sharing options...
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