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Bisque Firing Affect Glaze Results?

Bisque temps glaze results

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#1 cam

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Posted 15 August 2014 - 04:36 PM

How does over firing bisque to ^03 affect future glaze results? Or ( as I've finished unloading the kiln) ... Not reaching ^06.

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#2 neilestrick

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Posted 15 August 2014 - 05:00 PM

Cone 03 is hotter than cone 06. You'll find that the clay isn't quite as porous, so if you're dipping to glaze you'll need to dip slightly longer. Other than that no problems.


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#3 Biglou13

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Posted 15 August 2014 - 09:15 PM

How does different bisque temps affect woodfire, soda/salt? When you depend on kiln to provide.
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#4 Mark C.

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Posted 15 August 2014 - 09:32 PM

Lou

most of those process use use liner glazes on many forms so thats one effect. Its the same as it  is a tighter body and absorbs less.

Now as to salt I have seen in our salt kiln  use really over bisqued pieces come out fine ythat someone broght. The salt was less but they where white stoneware (b Mix ) which has a finer peaple anyway.

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#5 cam

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Posted 15 August 2014 - 09:35 PM

The kiln is electric.... Old small, manual Scutt...rewired awhile ago. I put a ^ 03 bar in the cone sitter in order to reach ^04. The variation in temps has increased (and reversed) over time. The bottom used to be the hot spot.
So, I hold the high fired ware longer in the glaze when dipping. Do I need to refire/bisque the lg platter that didn't reach ^ 06? Thnx

#6 Biglou13

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Posted 15 August 2014 - 09:50 PM

Mark are you saying lower bisque for wood fire, would produce more woo fired effects?
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#7 Min

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Posted 15 August 2014 - 10:04 PM

The kiln is electric.... Old small, manual Scutt...rewired awhile ago. I put a ^ 03 bar in the cone sitter in order to reach ^04. The variation in temps has increased (and reversed) over time. The bottom used to be the hot spot.
So, I hold the high fired ware longer in the glaze when dipping. Do I need to refire/bisque the lg platter that didn't reach ^ 06? Thnx

Like Neil said ^03 is hotter than ^06.  03 is approx 2014F and 06 is 1830F. Are you bisquing to the hotter temp and glaze firing to the cooler or the other way around? 

 

Might be an idea to put a few cone packs in the kiln to see what the variation is from top to bottom. Orton cone chart with temps here: http://www.ceramicstoday.com/cones.htm



#8 cam

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Posted 15 August 2014 - 10:24 PM

I do use cone packs in my kilns. That's why I know the variation. I try to bisque to 04 and glaze at ^ 5-6. Now I would like to know if I need to rebisque whatever does not reach even the 'cooler' ^06. Or does it not matter much... Just absorbing the glaze more (& what is the effect of that!) Sorry, I guess I don't make my guestions very clear.

#9 Min

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Posted 15 August 2014 - 10:32 PM

I do use cone packs in my kilns. That's why I know the variation. I try to bisque to 04 and glaze at ^ 5-6. Now I would like to know if I need to rebisque whatever does not reach even the 'cooler' ^06. Or does it not matter much... Just absorbing the glaze more (& what is the effect of that!) Sorry, I guess I don't make my guestions very clear.

 

Sorry, I read the 06 in your first post and got confused. If you got to 06 then I wouldn't worry about rebisque firing to 04. You can dip slightly quicker than you usually do and that should be fine. Scratch through it to test and if it looks about the same thickness then no worries.



#10 Mark C.

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Posted 15 August 2014 - 10:54 PM

No I'm not saying that-I got crossed up and thought this was about Higher temps bisquing affects.

Mark


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#11 neilestrick

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Posted 16 August 2014 - 08:27 AM

Bisque temps will have little to no effect on the look of finished work, whether glazed, wood fired, salt/soda fired, etc. The only effect different bisque temps will have is the porosity of the body during glazing, and whether or not you got all the stuff burned out in order to prevent out gassing during the glaze firing which will cause pinholes or blisters.

 

In college we always bisque fired to cone 08 without problem. Others find that 06 or 04 works better for their clay bodies. I bisque to 04 because my porcelain is too porous at 06 for the way I like to glaze. I prefer my stoneware bodies to be bisqued at 06, but porcleian wins in that battle, so the stoneware goes to 04, too.

 

I have salt glazed pieces that were previously fired to cone 10 (over fired bisque!), and they came out quite nice. They didn't glaze over quite as much, but they looked good.


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#12 Mark C.

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Posted 16 August 2014 - 12:06 PM

While on this refired of salt pots -I have had super results refiring sub standard salt fired pots in my reduction kiln to cone 10.

Mark


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#13 cam

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Posted 16 August 2014 - 04:42 PM

Thanks Neil... That's just the kind of explanation I needed.





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