Refractory Ceramic Balls

Refractory ceramic balls are used in high-temperature service — as filler and insulation in kilns and furnaces, in the lining of high-temperature and vacuum induction furnaces, and in high-temperature plants such as fertilizer and iron and steel. They hold their shape and carry load when hot, so they support and insulate where an ordinary ceramic would soften or crack.

They are made from industrial alumina and refractory kaolin, mixed to a set formula, formed into balls and fired at high temperature. That gives an alumina content of at least sixty-five percent and a dense, hard body that stays stable and strong when hot.

The balls are rated to a refractoriness of about 1800°C, and hold up to 1500°C under load, with a low refiring shrinkage so they keep their size in service. Low thermal expansion and good thermal-shock resistance let them take rapid heating and cooling without cracking.

The standard sizes are Φ25, 30 and 40 millimetres, with other sizes to order. They ship in cartons, ton bags or steel drums, by the tonne. Send the sizes and the amount for a quote.