julie
de
Jersey
asks
If I want to high bisque fire this clay, and then glaze at a lower temperature, what temperature should I bisque fire to?
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Réponses de Scarva:
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I would recommend firing to 1160°C on a computerized controller, hope this helps.
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Emma
de
United Kingdom
asks
I am looking for a white earthenware clay for making plaques for childrens imprints. Would you recommend this one. Thanks
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Réponses de Scarva:
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Yes this would be ideal, hope this helps.
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Iain
de
Ireland
asks
I bought this clay with some brush on amaco and botz glazes but have never used earthenware before. Do I bisque fire to the high temp of 1160 and then glaze fire to 1060. will the glaze take on the higher fire and what cones would you recommend for both firings. Thanks
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Réponses de Scarva:
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Normally you would bisque fire to 1000°C (cone 06) then glaze fire to 1060°C (cone 04). However it is important to note that the clay will not be vitrified. You could do a high bisque firing to 1160°C (cone 2) then a low glaze firing however it will be difficult to apply the glaze afterwards as the clay will not be absorbent.
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Jackie
de
United Kingdom
asks
I have been using B276 glaze (fired to 1140"C+20 min soak) on this clay which produces a fabulous cream body. However I have had trouble with cracking when the ware is used repeatedly. I changed glaze to GZ2150, (fired to 1240"C+20 minute soak) The clay is now vitrified and the glaze fit is great. BUT the colour of the glazed ware is not as good . It has a green/grey tinge to it. Has the clay changed colour due to vitrification, or is it the glaze changing the colour? Would firing to a lower temp help? Or a different glaze?
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Réponses de Scarva:
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What is your address and I will send a sample of a different transparent to try and see what you think?
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Rod
de
United Kingdom
asks
I recently purchased some your earthenware white clay. Could you send me the composition as percentage of oxides please?
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Réponses de Scarva:
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Hi,
SiO2 - 59.7%
TiO2 - 0.71%
Al2O3 - 19.89%
Fe2O3 - 0.69%
P2O5 - 0.07%
CaO - 5.03%
MgO - 0.22%
K2O - 1.63%
Na2O - 0.18%
Hope this helps!
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Paul
de
United Kingdom
asks
Have you got percentage shrinkage data for this clay, please, for firing to 1000C and then 1100C?
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Réponses de Scarva:
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Hi,
Shrinkage is approx 9% at 1100°C
Hope this helps!
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Denise
de
United Kingdom
asks
Can you tell me what cone I should bisque fire and what cone I should glaze fire thanks
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Réponses de Scarva:
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Hi, we suggest bisque firing all clays to 1000°C. Dependning on what glaze you want to use this body can fire to 1240°C
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RACHEL
de
United Kingdom
asks
If I bisque fired this clay to 1000c and then glaze fired to 1080c would my clay be vitrified?
Or would it need to be glaze fired to 1160c as is mentioned in the comments?
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Réponses de Scarva:
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The clay will not be vitrified at 1080oC, you would be best bisque firing to 1000oC then glaze firing to 1160oC using our GZ2130 transparent glaze. Hope this helps.
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Emily Day
de
United Kingdom
asks
Hi, my kiln fires up to 1099*C. If I bisque fire this to 1000 and then another firing with glaze to 1080, will this clay still work well? Emily
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Réponses de Scarva:
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It will still be porous, it will still work and you can create ceramic work from it however the glazes will still craze and if you put water in the vessel it will leak.
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Sian
de
United Kingdom
asks
Hi
I bisque fire to 900 and glaze fire to 1050.
Will this clay be ok at these temperatures?
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Réponses de Scarva:
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Hi, 900°C is quite low for a bisque firing, we bisque almost everything to 1000°C. Also, 1050 is quite low for this body, we'd suggest firing to at least 1140°C with this. Hope this helps!
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Clare
de
Ireland
asks
Can you foresee any problems if I bisque the ES130 to 1000 and use Amaco Potters Choice glazes fired to 1220? Will the vessels be vitrified?
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Réponses de Scarva:
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Hi, yes the vessels should be vitrified at this temperature, as to glaze fit with the Amaco glazes it would be prudent to test fire a sample piece first before comitting to work. Hope this helps!
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keith
de
United Kingdom
asks
I have been using your ES20 clay for years and am very happy, but was just wondering how your ES130 clay copes with thermal shock. The reason I ask is I use your ES20 for low fired smoked ware, Raku and Ferric Chloride reduction and it fits the bill perfectly, but I never fire above 1050 so the ES20 is possibly wasted?
Regards
Keith
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Réponses de Scarva:
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I would not change your caly body, if you are happy and it is working to not alter. The ES130 would not be a good alternative as it contains no grogg. Grogg and the percentage of grogg is important for thermal shock, the ES130 would not work well, there is a grogged version of white earthenware but even this would struggle with the thermal shock. A good alternative if you wanted to change your clay body would be our PF520 Super White Raku body it was specially developed for Raku so ideal for your purpose. Hope this helps.
Brendan
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