Ceramic balls for furnaces are made from special mullite-corundum porcelain. This porcelain consists of 90% aluminum oxide Al2O3.
· Imperial porcelain has a hardness of 9 on the Mohs scale and therefore yields only to diamond.
· Its operating temperature is 1650 °C, which is almost twice as high as that of jade.
· Its heat capacity is comparable to that of jade and reaches up to 1.1 kJ/(kg·°C).
Thanks to these properties, ceramic balls do not crack and do not change color due to prolonged exposure to cyclic temperature fluctuations.
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