Ceramic crucible and lids in the laboratory are high-temperature resistant experimental tools, widely used in chemical experiments, especially when high-temperature heating, melting, roasting, and other processes are required. 

* Premium Material: Made of ceramics or porcelain clay, with good heat resistance and chemical inertness. 

* Sealing performance: The lid can effectively seal the crucible, reduce gas escape, material volatilization, or external contaminants, and help control the experimental environment. 

* Brittleness: Although porcelain crucibles and lids have good high-temperature tolerance, they are very fragile and can easily break when hit or when the temperature changes suddenly (such as cooling too quickly). Therefore, they need to be handled with care when used.