Alumina ceramics are divided into high-purity type and ordinary type:

High-purity alumina ceramics are ceramic materials with an Al2O3 content of more than 99.9%. Because of its sintering temperature as high as 1650-1990°C and a transmission wavelength of 1-6μm, it is generally made of molten glass to replace platinum crucibles; use its light transmission It can be used as a sodium lamp tube because of its high corrosion resistance and alkali metal corrosion resistance; it can be used as an integrated circuit substrate and high-frequency insulating material in the electronics industry.

Ordinary alumina ceramics are divided into 99 porcelain, 95 porcelain, 90 porcelain, 85 porcelain and other varieties according to the Al2O3 content. Sometimes those with Al2O3 content of 80% or 75% are also classified as ordinary alumina ceramic series. Among them, 99 alumina porcelain materials are used to make high-temperature crucibles, refractory furnace tubes and special wear-resistant materials, such as ceramic bearings, ceramic seals and water valve plates, etc.; 95 alumina porcelain is mainly used for corrosion-resistant and wear-resistant parts; 85 porcelain Because some talc is often mixed in, the electrical properties and mechanical strength are improved, and it can be sealed with metals such as molybdenum, niobium, and tantalum, and some are used as electric vacuum devices.

Features of alumina ceramic fittings : A. Good wear resistance: the lining ceramic layer of alumina ceramic elbow is wear-resistant engineering ceramics, its hardness (HRA) ≥ 84, and its wear resistance is high chromium wear-resistant cast iron alloy pipe fittings more than 10 times. With a 5mm thick ceramic layer, its actual wear-resistant service life will be equivalent to 50mm thick wear-resistant cast steel.
B. Corrosion resistance: Alumina ceramic materials with different contents are selected, which have excellent anti-corrosion properties for different corrosive media, and are resistant to strong corrosive media such as acids, alkalis, and salts, and halogen salt corrosion. 
C. Good high temperature resistance: Alumina ceramic itself has the ability to withstand high temperatures above 1700 degrees Celsius, and is especially suitable for lining high-temperature burners and other equipment. The lining engineering ceramics have high strength, high hardness, and excellent wear resistance and corrosion resistance. 
D. Reduce engineering cost: Alumina ceramic pipes are mainly used to convey liquid-solid two-phase flow substances and corrosive media with particles, and are used to replace expensive stainless steel pipes, high-chrome cast steel pipes, and hard alloy wear-resistant pipes. It can directly reduce the engineering cost and prolong the service life at the same time. The product is cost-effective, which can save the cost and time of maintenance and replacement of materials. The manufacturing process is simple; the weight is light, and the transportation and installation are convenient.