The maximum temperature for a porcelain crucible is up to 1050°C (1922°F) according to the reference. Porcelain crucibles are made of high-temperature resistant materials and are commonly used in laboratories for gravimetric chemical analysis. They are relatively cheap and can be disposed of after use in precise quantitative chemical analysis. However, it is important to note that there are other types of crucibles, such as alumina ceramic crucibles, that can withstand higher temperatures. Alumina ceramic crucibles can withstand temperatures up to 1400℃ for short-term use and up to 1200℃ for melting samples with acidic substances. It is also mentioned that alumina ceramic crucibles should be kept away from hydrofluoric acid (HFA). Additionally, carbon-bonded and ceramic-bonded clay graphite and silicon carbide crucibles can be used for melting and holding various metals and alloys, with a temperature range from 400°C/750°F to 1600°C/2912°F.
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