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Making your own hexagonal shelves from alumina

The home-made kiln shelf (left) was fired it at cone 10. It is half the weight (and thickness) of the cordierite one (but remember that it does not have the thermal shock resistance of cordierite). It is made from a body consisting of 96.25% calcined alumina and 3.75% Veegum. It rolls out nicely and dries perfectly flat over about three days. But the Veegum does not give up its water easily. I cut it 1/4" larger than the other and it has fired to the same size; this body has incredibly low shrinkage.

Making your own hexagonal shelves from alumina

Related Pictures

A modern electric test kiln, a marvel of utility

A ConeArt 119 electric test kiln

This is a ConeArt 119D, 0.57 cu ft, 11"x9" cone 10 test kiln. The 120v model only needs 18 amps. We have the 220v model and have fired ours hundreds of times, mostly in the cone 4-7 range. The old BX controller is shown here, it is $300 cheaper, but don’t even think about getting that! Do not use your electric like a pop up toaster, make it a technological enabler of custom firing schedules, get the Genesis GX. Having good control of firing is a key to success and this is superior for that. These kilns are economical to fire. Big enough for 5 mugs, but I typically fire a dozen clay and glaze test specimens. We make our own super-thin shelves. The controller holds about 20 schedules, even controllable remotely (it is Wi-Fi connected). We can fire cone 03 up and down in three hours!

Links

Materials Calcined Alumina
Materials Veegum

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