KBart Posted April 9, 2020 Report Share Posted April 9, 2020 I bisque fired this earthenware at an 04. Glazed it with 5/6 glaze. I glaze fired at 6. It melted. The bottom piece had a smooth glaze but was warped. Link to comment Share on other sites More sharing options...
Mark C. Posted April 9, 2020 Report Share Posted April 9, 2020 Looks like you used low fire clay (cone 06) and fired it way to hot at cone 6 and it slumped earthenware should not be fired to cone 6 Link to comment Share on other sites More sharing options...
neilestrick Posted April 9, 2020 Report Share Posted April 9, 2020 If that's a white earthenware body, you got lucky that it didn't melt worse than that. Earthenware should be glaze fired at cone 04/05. Link to comment Share on other sites More sharing options...
Min Posted April 9, 2020 Report Share Posted April 9, 2020 I don't know where @KBart lives but there are claybodies sold in the earthenwares category that fire all the way up to 1270C in England. Not what we would call an earthenware on this side of the pond but there are many that fire in the cone 2-6 range there (and at least one that does cone 10). Not trying to be nit-picky but there are people on this forum from the UK so just trying to some avoid some possible confusion. Totally agree that @KBart looks like lowfire earthenware fired far too hot. Match the firing temperature/cone of the clay with the range of the glaze. For your lowfire clay use lowfire glazes. (there are exceptions to this but they require more thorough testing) Clayman earthenware Valentine earthenware clays Bath Potter's earthenware clays Link to comment Share on other sites More sharing options...
KBart Posted April 9, 2020 Author Report Share Posted April 9, 2020 I just reread the instructions that came with the clay. Sax white earthenware. It says it can be fired to cone 5. Would using a 6 make that much difference? Link to comment Share on other sites More sharing options...
Mark C. Posted April 9, 2020 Report Share Posted April 9, 2020 Yup I did not think of the UK angle Min-thanks I did not yet have my expresso and only thought stateside-My bad-usually I am more broad minded.`. Back to digging out wild blackberries on property. Link to comment Share on other sites More sharing options...
Bill Kielb Posted April 9, 2020 Report Share Posted April 9, 2020 38 minutes ago, KBart said: I just reread the instructions that came with the clay. Sax white earthenware. It says it can be fired to cone 5. Would using a 6 make that much difference? Likely not but if you told me it says cone 2-5 (or some range like that) then I would say it just can’t go to cone 6. What sticks in the back of my mind, regardless is how confident are we that this was not over fired? Were there witness cones in the firing and just curious how long did it fire. Link to comment Share on other sites More sharing options...
Min Posted April 9, 2020 Report Share Posted April 9, 2020 Hmmm, I looked up Sax white earthenware and found it on Amazon and School Specialty websites. General blurb says cone 06-5, but if you click on the specifications tab on the School Specialties website it says: cone 06 - 02 not cone 5. Link to comment Share on other sites More sharing options...
ronfire Posted April 10, 2020 Report Share Posted April 10, 2020 This is why I use only 1 type of clay (so far). Link to comment Share on other sites More sharing options...
Sorcery Posted April 10, 2020 Report Share Posted April 10, 2020 @Min....Max! Nice. 06-5 just sounds funny. But 02 clay at 6 would probly melt more than that...yeah? Looks like a strict 5 Max clay at 6. Not 02 at 6. What are the other pieces? Sorce Link to comment Share on other sites More sharing options...
liambesaw Posted April 10, 2020 Report Share Posted April 10, 2020 36 minutes ago, Sorcery said: @Min....Max! Nice. 06-5 just sounds funny. But 02 clay at 6 would probly melt more than that...yeah? Looks like a strict 5 Max clay at 6. Not 02 at 6. What are the other pieces? Sorce In my experience a cone 5 max at 6 is bloated, not completely melted. That looks more like a glaze than a clay to me! Link to comment Share on other sites More sharing options...
Bill Kielb Posted April 11, 2020 Report Share Posted April 11, 2020 5 hours ago, liambesaw said: In my experience a cone 5 max at 6 is bloated, not completely melted. That looks more like a glaze than a clay to me! Min found the spec. 02-06. It’s lowfire stuff with some misprinted marketing wank on it. Link to comment Share on other sites More sharing options...
liambesaw Posted April 11, 2020 Report Share Posted April 11, 2020 59 minutes ago, Bill Kielb said: Min found the spec. 02-05. It’s lowfire stuff with some misprinted marketing wank on it. Worst kind of wank for sure Link to comment Share on other sites More sharing options...
Mark C. Posted April 11, 2020 Report Share Posted April 11, 2020 06^ to 02 sounds like a slump at cone 6 for sure. User was lucky I think thats all that happened. Link to comment Share on other sites More sharing options...
neilestrick Posted April 11, 2020 Report Share Posted April 11, 2020 Usually white talc bodies melt into a green puddle at cone 6. I've seen several kilns ruined from firing a load to cone 5 instead of 05. Maybe this is a calcium body. @KBart what color is the clay when moist? Link to comment Share on other sites More sharing options...
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