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331635

Sigma-Aldrich

Tetramethylammonium hydroxide solution

25 wt. % in H2O

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Synonym(s):
TMAH solution
Linear Formula:
(CH3)4N(OH)
CAS Number:
75-59-2
Molecular Weight:
91.15
Beilstein:
3558708
MDL number:
MFCD00008280
PubChem Substance ID:
24859984
NACRES:
NA.21

vapor pressure

17.5 mmHg ( 20 °C)

Quality Level

200

form

liquid

concentration

25 wt. % in H2O

refractive index

n20/D 1.3806

density

1.016 g/mL at 25 °C

SMILES string

[OH-].C[N+](C)(C)C

InChI

1S/C4H12N.H2O/c1-5(2,3)4;/h1-4H3;1H2/q+1;/p-1

InChI key

WGTYBPLFGIVFAS-UHFFFAOYSA-M

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1 of 4

This Item
42631833490179267
Tetramethylammonium hydroxide solution 25 wt. % in H2O

Sigma-Aldrich

331635

Tetramethylammonium hydroxide solution

Tetramethylammonium hydroxide solution ACS reagent

Sigma-Aldrich

426318

Tetramethylammonium hydroxide solution

Tetramethylammonium hydroxide solution 25 wt. % in methanol

Sigma-Aldrich

334901

Tetramethylammonium hydroxide solution

Trimethylphenylammonium hydroxide solution ~25% in H2O (1.68 M)

Sigma-Aldrich

79267

Trimethylphenylammonium hydroxide solution

form

liquid

form

liquid

form

liquid

form

liquid

concentration

25 wt. % in H2O

concentration

1.0 M±0.02 M in H2O

concentration

25 wt. % in methanol

concentration

~25% in H2O (1.68 M)

refractive index

n20/D 1.3806

refractive index

n20/D 1.3497

refractive index

-

refractive index

n20/D 1.395

density

1.016 g/mL at 25 °C

density

1.005 g/mL at 25 °C

density

0.866 g/mL at 25 °C

density

-

Quality Level

200

Quality Level

200

Quality Level

200

Quality Level

-

Application

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

Signal Word

Danger

Hazard Classifications

Acute Tox. 2 Dermal - Acute Tox. 2 Oral - Aquatic Chronic 2 - Eye Dam. 1 - Skin Corr. 1B - STOT RE 1 Dermal - STOT SE 1

Target Organs

Central nervous system

Storage Class Code

6.1B - Non-combustible, acute toxic Cat. 1 and 2 / very toxic hazardous materials

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

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Synthesis of mesoporous hexagonal titanium aluminophosphate molecular sieves and their catalytic applications
Kapoor MP & Raj A.
Applied Catalysis A: General, 203(2), 311-319 (2000)
Study on anisotropic silicon etching characteristics in various surfactant-added tetramethyl ammonium hydroxide water solutions.
Yang CR, et al.
Journal of Micromechanics and Microengineering, 15(11), 2028-2028 (2005)
The characteristic behavior of TMAH water solution for anisotropic etching on both silicon substrate and SiO 2 layer.
Chen PH, et al.
Sensors and actuators A, Physical, 93(2), 132-137 (2001)
Magdalena Borkowska et al.
Nature nanotechnology, 15(4), 331-341 (2020-03-24)
Lysosomes have become an important target for anticancer therapeutics because lysosomal cell death bypasses the classical caspase-dependent apoptosis pathway, enabling the targeting of apoptosis- and drug-resistant cancers. However, only a few small molecules-mostly repurposed drugs-have been tested so far, and
Man Xu et al.
Environmental science & technology, 47(1), 110-118 (2012-06-12)
Elucidating dissolution kinetics and mechanisms at carbonate mineral-water interfaces is essential to many environmental and geochemical processes, including geologic CO(2) sequestration in deep aquifers. In the present work, effects of background electrolytes on dolomite (CaMg(CO(3))(2)) reactivity were investigated by measuring
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