Boehmite CAS No.: 1318-23-6, also known as boehmite, its molecular formula is γ- Al2O3 · H2O or γ- AlOOH, the crystal belongs to orthogonal (orthorhombic) crystal system and is crystallized into α Phase hydroxide mineral, which is mainly composed of γ- AlOOH , which can lose crystal water and convert into Al2O3 at high temperature.