The raw materials of mass-produced slip casting ceramics in industry mostly contain alkali powder. If the alkali powder continues to precipitate after the ceramics are fired, it means that the firing temperature of the ceramics is not enough (not very ripe) and it is not recommended to continue to be used as a food container.

Casserole is a kind of cooker. Traditional casserole is a ceramic product made of raw materials that are not easy to transfer heat, such as seasonable, feldspar and clay. Fired at high temperature, it has the characteristics of air permeability, adsorption, uniform heat transfer and slow heat dissipation. The recipes that depend on casserole include casserole chicken, casserole tofu, casserole fish head and so on. Due to the problems of manufacturing technology and raw materials, the traditional casserole is not resistant to the change of temperature difference, easy to burst and cannot be dry-burned. Aiming at this problem of traditional casserole, in recent ten years, after research and improvement, spodumene was added into raw materials to make a high-temperature resistant casserole, which can withstand hundreds of degrees of high temperature without cracking while maintaining its original advantages, greatly improving the practicality of casserole.