Alumina porcelain is a material with aluminum oxide (AL2O3) as the main component, which is used for thick film integrated circuits. Alumina porcelain has good conductivity, mechanical strength and high temperature resistance. It should be noted that ultrasonic cleaning is required. Alumina porcelain is a kind of porcelain with deep functions. Due to its superior performance, its application in modern society has become more and more in-depth, meeting the needs of daily use and special functions.

Alumina porcelain is now divided into high-purity type and conventional type. High-purity alumina porcelain is a porcelain material with an Al2O3 content of more than 99.9%. Because its sintering temperature is as high as 1650-1990℃ and the transmission wavelength is 1-6μm, it is generally made into molten glass to replace platinum crucibles: it is used as sodium lamp tubes for its light transmittance and resistance to alkali metal corrosion; it can be used as integrated circuit substrates and high-frequency insulation materials in the electronics industry. Conventional alumina porcelain is divided into 99 porcelain, 95 porcelain, 90 porcelain, 85 porcelain and other varieties according to the content of Al2O3. Sometimes, those with Al2O3 content of 80% or 75% are also classified as conventional alumina porcelain series. Among them, 99 alumina porcelain is used to make high-temperature crucibles, furnace tubes and special wear-resistant materials, such as porcelain bearings, porcelain seals and water valves; 95 alumina porcelain is mainly used as corrosion-resistant and wear-resistant devices; 85 porcelain is often mixed with some talc, which increases the electrical energy and mechanical strength, and can be sealed with metals such as molybdenum, niobium, and tantalum. Some are used as vacuum devices.