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jacqui sos

Firing Bisque And Glaze Pots Together

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Hi! I have a very small (tiny) electric kiln which I fire up to cone 04. Currently, I have been bisque firing terracotta and earthenware up to 1100C -1150C then glaze firing to 1060C - as the low fire glazes I have say to only go up to this temp. Results have been pretty good so far. I am aware of the dangers of single-firing (with glaze bubbling, pin holes etc) but now I am wondering if it might be possible to fire both bisque AND glaze together in the one firing - say up to 1060-1080C? What would be the down-side of doing this provided I brought the temperature up to 600C very slowly?

 

I really love your forums - and am very grateful to all the wonderfully generous potters, who so freely share their experience and advice!

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Definitely can do this - I regularly fire both together. (Keep on different shelves!) Downside is that your finished ware will not be as strong as it hasn't been taken up to maturity. You want to find the highest your glaze can go to and try that! Good luck.

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My experience of low fire glazes is that they have quite a wide range, often beyond that stated. 06 fired to 04 - no problem with any of mine! It would have to be a very 'picky' glaze. But probably not worth risking anything precious without testing first, as Johnny says.

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I used to fire some greenware in with glaze ware, putting a shelf between. This was usually in the last days of a class, or when I personally was in need of completing an order quickly with an extra glaze load right after the glaze load in. This allowed me to fire fully loaded loads. The shelf separation was a just in case. . . in case one of the greenware pieces went to smithereens during the firing. 

 

best,

Pres

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have done this often, not at that low a temperature, though.  i just put whatever needs firing into the kiln and set the computer controller to slow glaze with a preheat hold of 10 minutes.  the preheat is very slow so everything is safe.   no special shelves or anything, just what fits AS LONG AS IT IS ALL DRY!

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