Precautions for Using Glass Sand Core Crucibles
Due to the difference in the coefficient of thermal expansion between the glass and the sand core at the bottom of the glass sand core crucible, the sand core is prone to absorbing water during cleani
Due to the difference in the coefficient of thermal expansion between the glass and the sand core at the bottom of the glass sand core crucible, the sand core is prone to absorbing water during cleaning. Therefore, after cleaning, it is essential to place it in an oven at 105°C for drying before it can be used properly.
Since glass products are sensitive to rapid temperature changes, the glass sand core crucible should not be taken out immediately after being heated to 500°C. It is best to wait until the temperature in the furnace has cooled to room temperature before removing it. Alternatively, you can slightly open the furnace door to accelerate the cooling process, but the furnace door should not be opened fully, nor should the crucible be removed directly.
When placing the crucible on an instrument for use, make sure to clean the upper and lower sealing rings to remove any dirt. This will prevent uneven force on the crucible, which could lead to localized breakage.
Glass sand core crucibles have a limited service life. By paying attention to the above points, you can help extend the number of uses of the crucible.
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