A crucible is a small laboratory container designed to withstand very high temperatures, used for heating, melting, or calcining chemical substances. It’s typically made from refractory materials such as porcelain, ceramic, graphite, alumina, or noble metals, depending on the temperature range and chemical nature of the sample.

Crucibles are commonly employed in processes like calcination, solid fusion, and gravimetric analysis, where they allow accurate measurement of a sample’s mass after heating. Before use, they are dried and weighed to ensure precise results.

When handling a crucible, it’s essential to use heat-resistant tongs, avoid thermal shock, and select a material compatible with the chemical reaction to prevent contamination or damage.