High-purity alumina ceramics are ceramic materials with an Al₂O₃ content of more than 99.9%; ordinary alumina ceramics are divided into 99 porcelain, 95 porcelain, 90 porcelain, 85 porcelain and other varieties according to the different Al₂O₃ contents.
The density of alumina ceramics is about 3.5g/cm³, and the Rockwell hardness is HRA80-90, which is second only to diamond and far exceeds the wear resistance of wear-resistant steel and stainless steel. The wear resistance is equivalent to 266 times that of manganese steel and 171.5 times that of high-chromium cast iron, which can greatly extend the service life of the equipment. It has high compressive strength and bending strength, and can withstand heavy loads without being easily damaged.

Alumina ceramic backing glue uses mesh cloth or tape to stick multiple small-sized ceramics together to form a sheet-like ceramic lining.
Used in lower silos, chutes, drum rubber coating, etc.