High Strength Refractory Kiln Furniture Cordierite Sagger For Industrial Furnace

high temperature cordierite  sagger used for ceramics has high refractoriness, good thermal shock resistance, high load softening temperature, small expansion coefficient, long life and other fine features, widely used in ceramics industry (tunnel kiln brick, roller Kiln, Pusher kiln , a variety of sagger) and other kilns instead of clay and high aluminum brick, with good effect.

The saggars were used for the biscuit and the glost firing They were expected to last for about 40 firings; each potbank made their own in a saggar making workshop. Saggars were made from fireclay, by a saggar maker and two assistants: the framemaker and the bottom knocker. The framemaker beat the clay into a sheet on a metal table using a large mallet, the mow or mawl. Using a frame he would cut it to size, sprinkle it with sawdust and wrap it round a wooden block to make the walls. The framemaker was usually an appretice in his late teens. The bottom knocker, usually a boy in his early teens, did the same on a smaller scale, constructing the round or banjo-shaped bottom. Again the mow was used to beat the air out of the clay and flatten the sheet. The saggar maker was an experienced craftsman who paid his assistants out of his piece-work earnings: he took the bottom and the sides onto a wheel and using his thumbs joined the sides to the bottom.The green saggars were dried and then placed on the top of bungs during the next firing of the kiln.

The unfired ceramic ware was placed in saggars and then biscuit fired, before being glazed and again placed in saggars prior to being glost fired. Ware may then be decorated, and placed on refractory bats and fired again such as in a muffle kiln.

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