Potters & Sculptors - Making Rock from Mud
Wadding, as used in wood firings etc.
Does it shrink at all when fired, and would it also shrink if fired to ^6 in an electric kiln?
Just to give some background, I made and glaze fired a photo frame. A simple construction of two 180mm X 130mm X 4mm slabs with an aperture in one and the two slabs joined on three edges by narrow strips of clay also 4mm thick.
The first one was fine, I made two more and on the glaze firing, both back and front slabs have warped closing down the gap in between them. I understand the warping, probably my fault although I'm pretty careful with slab work and do know about clay memory.
I have another one bisque fired and ready to glaze. It's perfectly flat and straight with both slabs completely parallel to each other.
I wondered about using wadding between the slabs to at least maintain a parallel gap if it does warp a little, but whatever I use has to shrink at the same rate as the clay.
I have some small pieces of bisqued clay just slightly thinner than the gap and could coat those in a wax and alumina hydrate mix, but wondered about using wadding instead.