refractory clay

It is obvious that the kiln and the saggers must be composed of a very refractory clay, in order to resist such a fire.

The fusion is effected in pots of refractory clay, of which the general form is something like that shown in the sketch.

If a soft clay that contracts considerably is inlaid in a refractory clay, cracks will appear round the edges of the inlay.

From graphite, ground and sifted, mixed with sufficient refractory clay to render it plastic.

A long rod of refractory clay is given a churning movement in the mouth of the furnace, forcing the molten glass thru a tube.