What should I pay attention to when I use Alumina products?

• Alumina products are fragile. Please handle them carefully and avoid collision during unpacking, transportation, handling and cleaning.


• Check whether any micro-cracks exist before using Alumina products. Products with micro-cracks should not be used.


• Do not load too many materials in Alumina crucibles, which can increase the possibility of uneven heating.


• Slow ramp rate and cooling rate are highly recommended to minimize the thermal shock on crucibles. The rate can be faster in other temperature ranges, but it is recommended to be less than 5°C /MIN.


• To take the crucible directly out of furnace at high temperature may cause crack. If possible, take it out when the temperature is under 100°C.


• Alumina crucibles should not be heated by torch or furnaces that cannot control temperature change rate. The uneven heating can cause crack.

Heating and Cooling Instructions

• Alumina is sensitive to thermal shock. Try to warm up the furnace chamber slowly. Heating rate of 150-300°C per hour is recommended for the first 1-1.5 hours to reduce the impact of thermal shock. Lower the temperature as gradually as possible..


• t is recommended to keep at least 50 mm distance from the heating elements. Not having adequate space between your crucible and top and sides of your furnace may lead to cracking when the crucibles expands on heating.


• Large crucibles may need some preheating to overcome the possibility cracking due to thermal shock. We recommend placing your crucibles on top of a substrate plate of same material to reduce the risk of thermal shock. We recommend a heating rate of 150°C/ hr so that the Large crucibles can be evenly heated.


• Lower the temperature as gradually as possible. The cooling down rate is often half of the heating rate. Avoid contact of heated alumina products with a cold surface.


• Maximum Temperature Limit for Alumina Al2O3 Crucibles is 1600 °C