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FRITTED WARE -- Thermal Limitations

The resistance to thermal shock of fritted ware is less than that of non-porous labware. Therefore, articles of fritted ware should not be subjected to excessive temperature changes nor to direct flame.

Dry fritted crucibles at room temperature may be placed into a drying oven operating at 150 degrees C. However, most drying to constant weight is done at 110 degrees C.

Fritted ware may be safely heated in a furnace to 500 degrees C without ill effect, provided that the cycle of heating and cooling is gradual.

A cold, damp, ultra-fine porosity filter should never be subjected to a sudden temperature change since the evolution of steam may set up sufficient pressure within the filter to crack it.