Alumina belongs to the rhombohedral system with a melting point of 2054 ℃ and a boiling point of 2980 ℃.

Boron carbide is a black metallic glossy crystal, commonly known as black diamond, which is a kind of powder product made from boric acid as the main raw material, adding carbonaceous materials such as petroleum coke, smelting and crushing at high temperature. It belongs to superhard materials as well as diamond and cubic boron nitride.

Before the invention of boron carbide in 1929, silicon carbide was the hardest synthetic material known. It has a Morse hardness of 9, close to diamonds.

Various crystal forms of alumina (α, β, γ, δ, θ, etc.) have been found, among which γ-Al2O3 is also called active alumina.

Silicon dioxide is the most abundant mineral in the earth's crust. It is found on all continents in forms ranging from fine powders to huge rock crystals.

Zinc oxide is the most important inorganic active agent in rubber industry. Adding rubber particles can not only accelerate the curing rate, but also improve the cross-linking degree.

Nano silica can be used as electronic packaging materials

Ti4O7 is also known as Tilox Black, titanium black, titan black, magneli phase. Black powder.