Bioman Posted June 25, 2016 Report Share Posted June 25, 2016 I need to calcine some materials, so i have a few how to questions. I was told to simply put the materials in a bisque bowel and fire them. Currently don't have any Bisque lying around. Can i use a Stainless Steel bowel instead? Also, I need to calcine EPK Kaolin and Alberta slip. Do they get the same or different temperatures to calcine? Link to comment Share on other sites More sharing options...
MatthewV Posted June 25, 2016 Report Share Posted June 25, 2016 No you cannot use a stainless steel bowl. Well, maybe you could... but it might damage something or fume other materials into your material. A green ware bowl can be used. Yes, they can be calcined to the same bisque temperature. Link to comment Share on other sites More sharing options...
Bioman Posted June 25, 2016 Author Report Share Posted June 25, 2016 I would only have the calcined materials in the kiln. Firing to around 1300 is useless for anything else, so no other Bisque would be in the kiln. Also SS is routinely used in glass kilns for slump molds at around that temperature and does the kiln bricks no damage at all. Link to comment Share on other sites More sharing options...
Mark C. Posted June 25, 2016 Report Share Posted June 25, 2016 Never fired a stainless bowl to bisque temp you are on your own. Why not make some greenware-you fire the material in the green bowl or whatever form you have when its green. Fire it to bisque with the material you want to calcine. Metal is usually not fired to 1800. Link to comment Share on other sites More sharing options...
MatthewV Posted June 25, 2016 Report Share Posted June 25, 2016 I did look up melting temperatures and, in theory, you are fine. I wouldn't trust it mostly because I always have bisqued bowls laying around. Link to comment Share on other sites More sharing options...
Bioman Posted June 25, 2016 Author Report Share Posted June 25, 2016 Never fired a stainless bowl to bisque temp you are on your own. Why not make some greenware-you fire the material in the green bowl or whatever form you have when its green. Fire it to bisque with the material you want to calcine. Metal is usually not fired to 1800. OK, was not aware I could put the powders into green-ware. I thought it needed to be Bisque. So hitting cone 04 wont be too high, I only ask as a post I read said be careful not to burn/brown the materials but did not specify at what temperature that would occur. Link to comment Share on other sites More sharing options...
Joseph Fireborn Posted June 25, 2016 Report Share Posted June 25, 2016 I calcine ball clay and kaolin in my bisque to 04 all the time. It works fine. You can use green or bisque bowls. Doesn't really matter. I wouldn't use steel just because the kiln is expensive and who knows how that bowl was made and what might happen. I mean is it worth your kiln? I don't know if anything will happen, but I don't think its worth the risk even if it works 100 times. Link to comment Share on other sites More sharing options...
Mark C. Posted June 25, 2016 Report Share Posted June 25, 2016 There is no need for a special calcine fire -just fire material in your pots or sculpture when you bisque them. As far as metal I only trust metal up to about 1,200F after that dull red heat it can deform or worse. Link to comment Share on other sites More sharing options...
Bioman Posted June 25, 2016 Author Report Share Posted June 25, 2016 There is no need for a special calcine fire -just fire material in your pots or sculpture when you bisque them. As far as metal I only trust metal up to about 1,200F after that dull red heat it can deform or worse. So I make sure I have this right. It is OK to put the materials to be calcined in either Green Ware or Bisque and fire to 04. The Bisque can then be used, after cleaning out residual powder, dipped in glaze and fired to glaze temperature with typically no negative effect. Correct? Link to comment Share on other sites More sharing options...
Mark C. Posted June 25, 2016 Report Share Posted June 25, 2016 Yes that is correct-just rinse out the bisque to get the dust out/off and glaze as normal . I have done this in greenware for many many many decades. Link to comment Share on other sites More sharing options...
Bioman Posted June 25, 2016 Author Report Share Posted June 25, 2016 Great, thanks to all for the help Link to comment Share on other sites More sharing options...
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