ceramic clay query? about firing cones and clay bodies

by Brett Humbard
(Savannah, GA USA)





ceramic clay query? about firing cones and clay bodies:- I have come across several buckets of clay from my past that I no longer know the firing cone of for bisque....how do I go about testing this clay for the perfect cone to fire at?

Brett Humbard sculptor


Your website is wonderful, very informative with lots of how too. I have a BFA in studio sculpture and have been away from the field for almost 15yrs. I am now getting back into it and the brush up on things from you site has been really helpful. I look forward to using the site more in the future.

Thank you

Brett

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Reply by Peter Holland

To:- ceramic clay query? about firing cones and clay bodies

Dear Brett

Many thanks for your kind words and your very interesting query. Nice to know the website is working for you - that makes my day.

Glad you are getting back into it. Good luck.

Now, you see, you have exposed my soft underbelly, because for all these years I have had all the ceramics experts of the factories doing all the technical stuff for me.

One of those very experts (Tony Young) is now my partner in the Staffordshire Figurine Collective supervising all mine and John Bromley's figurines made right here in the UK under the new 'Stoke - World Capital of Ceramics' logo.

I am going to ask Tony to field this query and berate him as a foney if he can't answer it.

WATCH THIS SPACE!

Peter H (sculptor)

ps. Brett, feel free to place some of your work here in this section of you would like some free publicity for anything you are doing. Welcome aboard.





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ceramic clay query? about firing cones and clay bodies

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Ceramic Ware Bisque Firing Temperatures
by: Tony Young

Hi Brett,

There are some simple tests such as making a simple strip of each clay, marked up, and then fire them to a specific temperature to see what looks ok. It is a bit too obvious, I guess, but without any other evidence it is a case of 'suck it and see'. I think that lots of clays have a wide firing range and unless you wants a specific effect such as vitrification, you might be ok within your 'normal' range of firing temperatures.

Once the bisque is fired, the next stage would be to get the correct pint weight for the glaze. The more vitreous the bisque, the harder it will be to apply the glaze without an additive such as a wetting agent. If the bisque is very porous, it will take up a lot of glaze which might need to be thinned down.

To some degree, with ceramics, if the effect looks good it is correct - especially with decorative pieces. With tableware it is much more important to get the temperatures right.

Brett, we might be able to pick the brain of other 'experts' if you need more specific answers.

Tony

Thanks
by: Brett

Tony

thanks for the advice, I had the general idea of what you said before I ask...luckily I usually do other finishing techniques besides glaze.....I suppose I could also always do glaze test strips on the fired tiles or strips and see what I get if I want to glaze.....most of what I have came from college and I can contact the instructor for information....it was a stoneware that we used for every thing......sculpting and pottery.....I just know I have a lot of clay and there is no point in wasting it.....Thanks again. I will let you know how things turn out....

Brett

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