Tetramethylammonium hydroxide pentahydrate

Product Name: Tetramethylammonium Hydroxide Pentahydrate
English Alias: TMAH; Tetramethylammonium hydroxide hydrate
CAS Number: 10424-65-4
Molecular Formula: C₄H₁₃NO·5H₂O
Molecular Weight: 181.23 g/mol
Appearance: Colorless to light yellow transparent liquid (aqueous solution)
Package: 25 kg/drum, 200 kg/drum (HDPE plastic drum)

What is Tetramethylammonium Hydroxide Pentahydrate？

Tetramethylammonium Hydroxide Pentahydrate is a quaternary ammonium base commonly supplied as an aqueous solution. It appears as a colorless to light yellow transparent liquid with a characteristic amine odor. It is fully soluble in water and alcohols. The compound is a strong organic base widely used in electronics, chemical synthesis, and analytical applications due to its high alkalinity and thermal decomposition properties.

COA (Certificate of Analysis):

Item	Specifications	Analysis
Purity	98%	99%
(CH3)4NOH content	46.%min	48.9%
CO32-  content	1.0%max	0.58%
Cl   content	0.24%max	0.11%
Melting point	67.70℃	68.4℃
Appearance	White crystal	White crystal

Application:

Etching: Used in the semiconductor and photoelectric industries for the anisotropic etching of silicon.

Analytical Chemistry: Functions as an ion-pairing agent in chromatography (GC/MS, capillary electrophoresis) and as a polarographic reagent.

Organic Synthesis: Serves as a catalyst and is used to synthesize compounds like vinyl halides and tetramethylammonium dithiocarboxylates.

Nanomaterial Synthesis: Used to prepare iron oxide nanoparticles for use as MRI contrast agents.

Energy and Gas Applications: Its properties as a clathrate hydrate, including high proton conductivity and carbon dioxide absorption, make it a promising candidate for energy devices, gas separation, and gas storage.

Safety Profile:

Tetramethylammonium Hydroxide is highly corrosive and causes severe skin burns and eye damage. May be fatal if swallowed or inhaled. Use appropriate personal protective equipment including chemical-resistant gloves, face shield, and adequate ventilation when handling. Avoid contact with skin and eyes. The substance is toxic to aquatic life. For comprehensive safety information, always consult the full Safety Data Sheet (SDS).

Storage Requirements:

Store in a cool, well-ventilated area away from direct sunlight. Keep containers tightly closed and sealed. Maintain storage temperature between 15-25°C. Keep away from acids and strong oxidizing agents. Use corrosion-resistant equipment for handling.

Transport & Packaging:

Tetramethylammonium Hydroxide Pentahydrate is packaged in HDPE plastic drums (25 kg or 200 kg net weight per drum). Transport as corrosive material according to applicable regulations. Ensure containers are properly sealed and protected from physical damage during transportation. Store away from incompatible materials.