[Clayart] sawdust instead of straw in primitive kiln
magnolia.mud.list at gmail.com
Sat Apr 2 17:12:33 UTC 2022
(I fire at cone 10 gas reduction).
I have been playing with laminated clay bodies. using a standard cone 10
clay body and applying a mixture of kaolins only as a paste for the outer
layer. The outler layer fired to cone 10 is still absorbant (aka: has fine
holes in the kaolin layer). so far, I have no problem with the interface
of the two layers. For thrown ware, I apply the tacky (but not a slip)
kaolin paste to the form near the final step of throwing. On handbuilt
ware the paste is added after the form is completed.
If you were to use a similar layer between your inside surface clay body
and your outside clay body, you might get the "insulation for hot drinks"
you were looking for.
If you are using a mid temperature clay body, then use a high fire course
clay body for the middle layer, or just use the sawdust clay as a middle
On Sat, Apr 2, 2022 at 6:55 AM Robert Harris <robertgharris at gmail.com>
> I've put sawdust in clay. Biggest problem is that it caused serious
> pinholing in the glazes. Otherwise it fired just fine.
> Obviously it depends how much you put in! (My aim was to produce a piece
> with enough air gaps that it would provide insulation for hot drinks,
> didn't really work).
> We also wad all of the posts in our kiln, even in a regular reduction
> firing, and we use sawdust (about 25-30% by weight which is probably >60%
> by volume), makes the wadding just crumble right off.
> Not sure what your aim is, by adding sawdust.
> The long fibers in paper help stabilise the clay, but sawdust won't provide
> On Fri, 1 Apr 2022 at 11:29, Carolyn Curran <cncpots2 at gmail.com> wrote:
> > My inarticulate bad. Sorry I confused you. I intended to add sawdust
> > IN the clay body along with vermiculite or perlite and grog...sort of a
> > paper clay situation, since straw and sawdust both have cellulose. I
> > would probably wet it so there won't be particles flying through air.
> > With my COPD and chronic bronchitis, I don't think I'd play with a
> > sawdust firing, although we have a trash can with holes here that was
> > probably used in that way. (Heck, I only use non toxic iiquid
> > combustibles for any raku..have a bottle of
> > high test Everclear booze for the purpose, use sparingly at bottom of
> > combustion chamber.. I have had great success with the alcohol with
> > scale work in old Aim test kiln with one vase almost 8" tall which was
> > super unique in subtle coloration. It is still a big favorite.
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