Tetramethyl Ammonium Hydroxide

Acronymic: TMAH
Synonym: N,N,N-Trimethylmethanaminium hydroxide
CAS No.: 75-59-2
U.N.No.: 1835
Hazard class: 8
Packing group: II
Chemical formula: (CH3)4NOH·5H2O
Molecular weight: 181.15
Appearance: white crystal, contains 5 crystal waters in each molecular. Be easily solubled in alcohol and water.
Melting Point(°C): 63
Quickly absorbs carbon dioxide in air to carbonate. Strong organo-alkali, corrosive nature. Easily deliquesces, be kept in lutation. Decomposed into methanol and trimethylamine at 135°C.

Quality Index:

White crystal
Content (%)
Carbonate (as tetramethyl ammonium carbonate)%
Involatile Matters, %
Chloride, %

Packing: 250g/plastic bottle, 40 bottles/piece; or on the clients' requirements.

Use: Used in no residue catalyst in organosilicon polymerization processes as Aminoalkyl Silicone Fluid, Methyl Silicone Oil, Silicone Rubber. When used solutions, can be a supporting electrolyte in polarography, a developer for photoresists, and a washing liquid for electron and electric plating.