High alumina glass is: ultra-high pressure resistant glass is made of aluminosilicate glass with a purity of 99.5. The ultra-high pressure resistant glass of various specifications has both high pressure resistance and high temperature resistance. It belongs to alkali-free aluminosilicate glass series. The product has good permeability, is conducive to human observation, has high softening point temperature, is suitable for high and low temperature working occasions, and can be heat treated like ordinary glass to increase the pressure resistance of the outer surface of the glass.