Fade Lee Posted May 20, 2014 Report Share Posted May 20, 2014 Great so I bought cone 05 clay instead of cone 5 clay and of course realized this after I fired a few pieces to cone 5. Is there any way I can salvage these couple of pieces? If I try to glaze them, at this point, what cone glaze do I fire to? I've been told these are probably lost but I'm hoping you guys might have some creative alternatives... Link to comment Share on other sites More sharing options...
Mark C. Posted May 20, 2014 Report Share Posted May 20, 2014 Are you saying they where bisqued to cone 5? If thats so just toss them and start over as you wll save time and $ moving forward Mark Link to comment Share on other sites More sharing options...
TJR Posted May 20, 2014 Report Share Posted May 20, 2014 I agree. Not worth the headache. TJR. You would have to glaze them at cone 05. You are lucky they didn't melt all over the place. Link to comment Share on other sites More sharing options...
Marc McMillan Posted May 20, 2014 Report Share Posted May 20, 2014 It's interesting the 05 clay survived. Link to comment Share on other sites More sharing options...
williamt Posted May 20, 2014 Report Share Posted May 20, 2014 Would be interesting to see a picture. Pitching them is probably best. There is a good chance if you glazed and fire to 05, you would have a glaze mismatch and it would craze or shiver. Link to comment Share on other sites More sharing options...
neilestrick Posted May 20, 2014 Report Share Posted May 20, 2014 If you truly have 05 clay, it should have melted at 5. Pictures? Link to comment Share on other sites More sharing options...
Benzine Posted May 20, 2014 Report Share Posted May 20, 2014 If you truly have 05 clay, it should have melted at 5. Pictures? See, that's why, when I first read the topic, I thought he meant that the bisque was just over fired, to Cone 5, instead of 05, but using a 5 clay. Link to comment Share on other sites More sharing options...
bciskepottery Posted May 20, 2014 Report Share Posted May 20, 2014 If you truly have 05 clay, it should have melted at 5. Pictures? I've fired Standard's 104 earthenware to cone 6 with no problems; however, I would not try that with a low fire white clay body. Link to comment Share on other sites More sharing options...
neilestrick Posted May 21, 2014 Report Share Posted May 21, 2014 Terra cotta clays can definitely go hotter than low fire white bodies. The grog in Standard's 104 pushes it higher than the non-grogged version (103). They actually test/recommend it at cone 4. I've used other terra cottas that max out at 2-3. Way too brittle beyond that. Link to comment Share on other sites More sharing options...
schmism Posted May 21, 2014 Report Share Posted May 21, 2014 One of the kilns at the studio i take classes at had a bisk load get overheated and fired to about 05 instead of the standard 1830 (06) they do. We glazed them but they took glaze poorly and im many cases did not set right on the pieces. (our clay is a stoneware usually fired to ox^6) Link to comment Share on other sites More sharing options...
neilestrick Posted May 21, 2014 Report Share Posted May 21, 2014 One of the kilns at the studio i take classes at had a bisk load get overheated and fired to about 05 instead of the standard 1830 (06) they do. We glazed them but they took glaze poorly and im many cases did not set right on the pieces. (our clay is a stoneware usually fired to ox^6) Bisque firing to 05 instead of 06 should not make much of a difference at all. In most cases it wouldn't even be noticeable. I'm betting it went quite a bit hotter than 05 if it wouldn't take glaze well. Maybe they went to 5 instead of 05. Link to comment Share on other sites More sharing options...
schmism Posted May 21, 2014 Report Share Posted May 21, 2014 Bisque firing to 05 instead of 06 should not make much of a difference at all. In most cases it wouldn't even be noticeable. I'm betting it went quite a bit hotter than 05 if it wouldn't take glaze well. Maybe they went to 5 instead of 05. This is what i thought. Having not run a kiln yet i dont have enough experience to speak on the issue. Its my understanding from reading that 06, 05, 04 are all decent bisque temps depending on your clay body. The staff seemed disappointed in the mis-fire, when i asked how hot it did get the answer i was told was "one or 2 cones above our normal bisque"...... Dip times in glazes had to be trippled or more and even then the glaze wanted to run off and took forever to dry. After seeing the results of the glaze fire (ox6) we both agreed virtually all those pieces were basically only good for skeet targets. Link to comment Share on other sites More sharing options...
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