Regarding acceptable porosity of fired clay for functional ware, I talked
to one of the head people at a large clay company many years ago to find a
good body for cone 10, and he said it should be 2% or less. I don't recall
if he gave any reasoning. I won't give you the names involved in case I
have misremembered, but I still go by that myself. YMMV.
Anybody else have a different answer?
On Fri, Jan 21, 2022 at 10:34 AM Vanessa Greene <firstname.lastname@example.org> wrote:
> Any thoughts from all you experienced potters about those clays that are
> marketed as a wide ranging temp clay, cone 6-10…..are they really fully
> vitrified at cone 6? I hear very different opinions about this…..what
> absorption rate is necessary for functionally food safe pots? (
> continental clays B clay, Buff etc…. )
> I have always fired these clays to cone 10 but some people suggest that
> these clays are suitable for both cone 6 and 10 firings. Thoughts?
> Vanessa Greene
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