Pompots Posted July 19, 2013 Report Share Posted July 19, 2013 Hi guys, I'm making some porcelain eggs slip cast, I usually do bisque firing ^04 and then clear glaze firing ^06. I need to finish some by next week and I don't have enough ware to do 2 low fire firings, so, I'm thinking to do single firing, I'm using ^6 laguna porcelain slip and the clear is ^06 commercial glaze. Any thoughts on this matter, do you think it would be ok? Pom. Link to comment Share on other sites More sharing options...
Wyndham Posted July 19, 2013 Report Share Posted July 19, 2013 How do you glaze them, spray or brushing or dipping. raw is a bit different bird that bisk glazing Don't know about trying a new technique with a dealine coming up, how about if the whole load screws up, is it worth it? I doubt you have that much more $$$ in a double firing over a single, so why chance it. Just a thought. Wyndham Link to comment Share on other sites More sharing options...
jrgpots Posted July 19, 2013 Report Share Posted July 19, 2013 Hi guys, I'm making some porcelain eggs slip cast, I usually do bisque firing ^04 and then clear glaze firing ^06. I need to finish some by next week and I don't have enough ware to do 2 low fire firings, so, I'm thinking to do single firing, I'm using ^6 laguna porcelain slip and the clear is ^06 commercial glaze. Any thoughts on this matter, do you think it would be ok? Pom. I have fired clear over raw low fire clay and slip in the past. You need to ramp it slowly. How big is the hole in the egg? If it is too small to allow outgassing, it will problematic, since the inside of the ware will be where the outgassing will occur since the outside surface is glazed. Take it slow. Jed Link to comment Share on other sites More sharing options...
Mark C. Posted July 19, 2013 Report Share Posted July 19, 2013 Slip cast eggs will be tough as nails-as far as the form goes. Slip cast forms are even wall thickness and very tough becuase of this. Single fire issues will all be with glaze application -If you can get through that just fire them a bit slower. Let us know how this turns out. Mark Link to comment Share on other sites More sharing options...
Min Posted July 19, 2013 Report Share Posted July 19, 2013 Just curious, why are you using a ^6 porcelain and firing to ^04 and 06? Min Link to comment Share on other sites More sharing options...
Pompots Posted July 20, 2013 Author Report Share Posted July 20, 2013 How do you glaze them, spray or brushing or dipping. raw is a bit different bird that bisk glazing Don't know about trying a new technique with a dealine coming up, how about if the whole load screws up, is it worth it? I doubt you have that much more $$$ in a double firing over a single, so why chance it. Just a thought. Wyndham Hi Wyndham, thanks for your input, I brush the glaze on, it is not really about the cost of the firing but that i don't have enough ware for the second firing, my kiln is 32"X27" I have enough for the bisque, but the glaze i usually do ^5 glaze, this are special items that i glaze to cone ^06 so, i just throw them when i bisque. I dont know if i should do a full firing for only 9 eggs. Link to comment Share on other sites More sharing options...
Pompots Posted July 20, 2013 Author Report Share Posted July 20, 2013 Hi guys, I'm making some porcelain eggs slip cast, I usually do bisque firing ^04 and then clear glaze firing ^06. I need to finish some by next week and I don't have enough ware to do 2 low fire firings, so, I'm thinking to do single firing, I'm using ^6 laguna porcelain slip and the clear is ^06 commercial glaze. Any thoughts on this matter, do you think it would be ok? Pom. I have fired clear over raw low fire clay and slip in the past. You need to ramp it slowly. How big is the hole in the egg? If it is too small to allow outgassing, it will problematic, since the inside of the ware will be where the outgassing will occur since the outside surface is glazed. Take it slow. Jed Hi Jed, Thanks a lot for your comment, the hole in the egg is not that small i think is about 1/2" I use a rubber stopper to cover it. I might try it then with the slow firing schedule. Link to comment Share on other sites More sharing options...
Pompots Posted July 20, 2013 Author Report Share Posted July 20, 2013 Slip cast eggs will be tough as nails-as far as the form goes. Slip cast forms are even wall thickness and very tough becuase of this. Single fire issues will all be with glaze application -If you can get through that just fire them a bit slower. Let us know how this turns out. Mark Thanks Mark, you have the same idea than Jed, so I might try it. I will let you know how it turns out for sure. Link to comment Share on other sites More sharing options...
Pompots Posted July 20, 2013 Author Report Share Posted July 20, 2013 Just curious, why are you using a ^6 porcelain and firing to ^04 and 06? Min Hello Min, I usually fire my castings to ^6, but in this case because of the shrinkage I've been firing only to bisque temperature, the eggs turn out really fine and they are not functional but decorative so it doesn't really matters if the form reached maturity, they are strong enough for the purpose. Link to comment Share on other sites More sharing options...
Pompots Posted July 23, 2013 Author Report Share Posted July 23, 2013 Hi Guys, FYI...... The eggs came out really fine, so, the answer to the question is YES it is possible to once fire (slow ramp) porcelain slip cast eggs at ^06 with absolutely no problems. Thanks to all of you who took the time to respond. Best Pom. Link to comment Share on other sites More sharing options...
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