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Tetramethylammonium Hydroxide

Name: Tetramethylammonium Hydroxide
SKU: 0

Tetramethylammonium Hydroxide
CAS No.: 75-59-2
Molecular Formula: C4H13NO
Molecular Weight: 91.15

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PRODUCT DESCRIPTION

Tetramethylammonium hydroxide liquid state: Commonly, it is a colorless and transparent aqueous solution (concentration 25% - 50%). High-purity products have no impurity color, while industrial grades may be slightly light yellow. It has strong alkalinity (pH≈14) and an ammonia smell, and its viscosity increases with the increase of concentration. Solid state: White crystalline powder, with extremely strong hygroscopicity. At room temperature, it rapidly deliquesces into a viscous liquid. Therefore, it rarely exists in pure solid form and mostly in the form of hydrates (such as pentahydrate).

Chemical Properties

Property	Value
Melting point	°C
Boiling point	110 °C
Density	0.866 g/mL at 25 °C
Vapor Pressure	17.5 mm Hg ( 20 °C)
Refractive Index	n20/D1.384
Fp	80 °F
Storage Temp.	Store below +30°C.
Solubility	Methanol (Sparingly), Water (Slightly)
Form	Solution
Color	APHA: ≤10
Odor	strong ammonia-like odor
PH	>13 (H2O, 20°C)
Water Solubility	Soluble in water.
Sensitive	Air Sensitive
Merck	14,9224
BRN	3558708
Stability:	Stable. Flammable. Incompatible with strong oxidizing agents, strong acids.
InChIKey	WGTYBPLFGIVFAS-UHFFFAOYSA-M
CAS DataBase Reference	75-59-2(CAS DataBase Reference)
EPA Substance Registry System	Tetramethylammonium hydroxide (75-59-2)

Safety Information

Property	Value
Hazard symbols	C, T, F, Xn
Hazard class codes	24/25-34-20/21/22-39/23/24/25-23/24/25-10-21/22-25-21-11-67-36-52-48/24-27/28-23-35-36/38
Safety descriptions	45-36/37/39-26-16-36/37-28
UN dangerous goods number (1)	UN 1835 8/PG II (TETRAMETHYLAMMONIUM HYDROXIDE AQUEOUS SOLUTION with more than 2.5% but less than 25% tetramethylammonium hydroxide)
UN dangerous goods number (2)	UN 1835 8/PG III (TETRAMETHYLAMMONIUM HYDROXIDE AQUEOUS SOLUTION with not more than 2.5% tetramethylammonium hydroxide)
UN dangerous goods number (3)	UN 3423 6.1/PG I (TETRAMETHYLAMMONIUM HYDROXIDE, SOLID)
WGK Germany	1
RTECS number	PA0875000
F	4.4-10-34
TSCA	TSCA listed
Hazard class	3
Packing group	II
HS code	29239000
Storage class	3 - Flammable liquids
Hazard class (category)	Acute toxicity, Category 2, Dermal Acute toxicity, Category 2, Oral Acute toxicity, Category 3, Inhalation Hazardous to the aquatic environment — long-term hazard, Category 3 Serious eye damage, Category 1 Flammable liquid, Category 3 Skin corrosion, Category 1B Specific target organ toxicity — repeated exposure, Category 1, Dermal Specific target organ toxicity — single exposure, Category 1
Hazardous substances data	75-59-2 (Hazardous Substances Data)

Product Usage
Tetramethylammonium Hydroxide (TMAH) is a strongly alkaline compound that appears as a colorless, transparent liquid. It is readily soluble in water and ethanol, possesses strong corrosive properties, and exhibits excellent catalytic activity. Its primary application lies in organic synthesis, where it serves as a strong base catalyst to accelerate reactions such as transesterification and hydrolysis. In the electronics sector, it is utilized for semiconductor wafer cleaning and photoresist stripping, thereby ensuring precision in chip manufacturing. In the chemical industry, it functions as an acid scavenger and neutralizing agent in organic synthesis, and is also employed in the preparation of quaternary ammonium salts; consequently, it stands as an indispensable key raw material across fields such as fine chemicals, electronics manufacturing, and pharmaceuticals.

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