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#1
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Bisque firing temp?
Is there a general rule about what temp (cone) to fire to the bisque stage? For
example, is it usually one cone under what you would use for glaze? I have some clay that is Cone 5 and it seems I read that you fire at a lower cone for bisque than when you glaze. Thanks for answering all my ultra newbie questions. |
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#2
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Most folks bisque at Cone 06-04. If you bisque your cone 5 clay at cone 4,
you will not be able to easily glaze the pieces. 06/04 is a good temp that drives out a lot of the moisture but still leaves your pieces porous enough to accept the glazes. Good luck. Steve in Tampa, FL "GaSeku" wrote in message ... Is there a general rule about what temp (cone) to fire to the bisque stage? For example, is it usually one cone under what you would use for glaze? I have some clay that is Cone 5 and it seems I read that you fire at a lower cone for bisque than when you glaze. Thanks for answering all my ultra newbie questions. |
#3
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i agree with Steve. note too that you don't always bisque at a lower
temperature than a glaze firing. the one example of this i can think of is that a lot of commercial low-fire glazes are fired at about 06-05 but are best applied to bisqueware that's been fired to 04. |
#4
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As a point of interest; UK bisque temperatures are much the same with
the exception of our white earthenware clays. At 06-04 these are severely underfired and have not completed their *primary* shrinkage, so much so, that if you bisque at that temperature and then glaze fire 04 plus the body will shrink more than the glaze, and the latter will *shiver* off, especially on the rims. The right bisque temperature for these clays is more usually in the regions of cone 1 (1150 C. ish)! Steve Bath UK In article , SpunMud writes i agree with Steve. note too that you don't always bisque at a lower temperature than a glaze firing. the one example of this i can think of is that a lot of commercial low-fire glazes are fired at about 06-05 but are best applied to bisqueware that's been fired to 04. -- Steve Mills Bath UK |
#5
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"Steve Mills" wrote in message ... As a point of interest; UK bisque temperatures are much the same with the exception of our white earthenware clays. At 06-04 these are severely underfired and have not completed their *primary* shrinkage, so much so, that if you bisque at that temperature and then glaze fire 04 plus the body will shrink more than the glaze, and the latter will *shiver* off, especially on the rims. The right bisque temperature for these clays is more usually in the regions of cone 1 (1150 C. ish)! Steve Bath UK In article , SpunMud writes i agree with Steve. note too that you don't always bisque at a lower temperature than a glaze firing. the one example of this i can think of is that a lot of commercial low-fire glazes are fired at about 06-05 but are best applied to bisqueware that's been fired to 04. -- Steve Mills Bath UK I use a lot of different formulas of stoneware clays, and fire to 600-650 degrees farenheit to bisque. It's never been necessary for me to go much higher than the conversion temperature of the clay. Of course, this is going to vary, depending on the formula, the amount of grog, etc. Your altitude and your humidity level are going to make a difference too, but here at sea level, it works for me. Saves on energy ($), and cooling time, both important considerations for production work. Wayne Key West |
#6
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It's never been necessary for me to go much higher than the conversion
temperature of the clay. Of course, this is going to vary, depending on the formula, the amount of grog, etc. Your altitude and your humidity level are going to make a difference too, but here at sea level, it works for me. Saves on energy ($), and cooling time, both important considerations for production work. Wayne Key West Hello Wayne Your answer is worth heaps. We trend to take what is written down as gospel without testing it ourselves. I am working with a white stoneware clay that matures at cone 6. Possibly has a frit of some sort in it. When you think about it there probably isn't a great deal to burn out after it reaches the conversion temperature. I have been firing bisque to 1000c because that is what I was told I had to do The only question is What adjustments have you made to your glazes? Regards John Webb |
#7
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Just found out my school fires Cone 10 clay to bisque at 08.
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#8
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holy cow! bisquing at 600-700 F? that's not even on my "orton" notes. (cone
022 shows at 1087F). i might have to try that someday. if it works, what a tremendous savings in time and energy! |
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