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Tetramethylammonium hydroxide solution (25 wt. % solution in water) may be used as a base for pH adjustment to obtain hexagonal mesoporous aluminophosphate (TAP). Tetramethylammonium hydroxide is a quaternary ammonium salt generally used as an anisotropic etchant for silicon due to its high silicon etching rate.
TETRAMETHYL AMMONIUM HYDROXIDE SOLUTION 25% Manufacturer
