To maintain a crucible, follow these steps:
1. Never use a damaged crucible. If a crucible is cracked or damaged, it should not be used as it can lead to dangerous explosions.
2. Store crucibles in a dry area at temperatures above 32oF/0oC. Cold or wet crucibles should not be placed in service to prevent water/molten metal explosions.
3. Use different crucibles for different types of metals to avoid contamination.
4. Completely empty the crucible after each use. Metal left to solidify in the crucible may expand when re-heated, potentially causing the crucible to be destroyed.
5. "Temper" the crucible before usage. Heat the empty crucible to a temperature of about 500 deg F and hold it for 20 minutes. Then work the crucible to red heat. Turn off the heat and allow the crucible to cool slowly. This process removes any moisture from the crucible, making it ready for use.
6. If the crucible is used for charging molten metal, select a crucible that is mechanically strong and able to survive physical shocks. Crucibles with high carbon content and a directionally oriented graphite structure provide excellent impact resistance.
7. Ensure that the crucible has a durable protective glaze. Rough handling can damage the glaze, leading to oxidation damage to the crucible. Sharp edges of extruded aluminum ingots should be avoided as they can cut deeply into the crucible, causing cracks.
8. If you have a high purity crucible, store it in a box or other disposable packaging material to protect it from damage or contamination. Consider using bubble wrap or packing paper for extra protection. Secure all parts tightly to prevent movement during storage or transportation.
9. Keep the crucible out of direct sunlight and humidity levels if possible. These elements can alter the crucible's structure over time. If exposure to sunlight or humidity is unavoidable, closely monitor and take proper precautions.
10. Handle crucibles with care using properly fitting tongs to avoid damage or failure.
11. Use corresponding lids for crucibles, which are typically ill-fitting to allow gases to escape during heating. Lids can be made from the same materials as the crucible or other high-temperature resistant materials like mica.
12. Before using crucibles in chemical analysis, ensure they are clean and free from contaminants that could affect the accuracy of results. Heat the crucibles to a high temperature to burn off any impurities. Precisely pre-weigh the crucible and its lid for accurate results.
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