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Quartz crucible requires high purity quartz sand Since quartz crucibles need to withstand high temperatures and corrosive environments during use, the purity of the material is very high. Ordinary quartz sand may contain impurities, such as iron oxide, aluminum oxide, etc. These impurities may affect the experimental results and cause cracks and damage on the surface of the quartz crucible. Therefore, a quartz crucible requires a quartz sand content of at least 99.9%. Such high-purity quartz sand can ensure the quality and performance of quartz crucibles and improve the accuracy and reliability of experiments.

Foundry sand is mainly classified according to its particle size and chemical composition. Particle size standard According to the particle size of the sand, foundry sand can be divided into the following standards: -Coarse sand: 0.6mm-2.36mm; – Medium sand: 0.2mm-0.6mm; – Fine sand: 0.075mm-0.2mm; – Ultrafine sand: less than 0.075mm.