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334901

Sigma-Aldrich

Tetramethylammonium hydroxide solution

25 wt. % in methanol

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Synonym(s):
N,N,N-trimethyl-methanaminium hydroxide, TMAH, TMAOH
Linear Formula:
(CH3)4N(OH)
CAS Number:
75-59-2
Molecular Weight:
91.15
Beilstein:
3558708
MDL number:
MFCD00008280
PubChem Substance ID:
57648847

vapor pressure

17.5 mmHg ( 20 °C)

Quality Level

200

form

liquid

concentration

25 wt. % in methanol

impurities

≤10% water
≤2% chloride

density

0.866 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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This Item
32825186631B32602
Tetramethylammonium hydroxide solution 25 wt. % in methanol

Sigma-Aldrich

334901

Tetramethylammonium hydroxide solution

Tetramethylammonium hydroxide solution 10 wt. % in H2O

Sigma-Aldrich

328251

Tetramethylammonium hydroxide solution

Tetraethylammonium hydroxide solution ~25% in methanol (~1.5 M)

Sigma-Aldrich

86631

Tetraethylammonium hydroxide solution

Benzyltrimethylammonium hydroxide solution 40 wt. % in methanol

Sigma-Aldrich

B32602

Benzyltrimethylammonium hydroxide solution

form

liquid

form

-

form

liquid

form

liquid

concentration

25 wt. % in methanol

concentration

10 wt. % in H2O

concentration

~25% in methanol (~1.5 M)

concentration

40 wt. % in methanol

impurities

≤10% water, ≤2% chloride

impurities

-

impurities

-

impurities

-

density

0.866 g/mL at 25 °C

density

1.006 g/mL at 25 °C

density

-

density

0.92 g/mL at 25 °C

Quality Level

200

Quality Level

100

Quality Level

100

Quality Level

200

General description

Tetramethylammonium hydroxide is a quaternary ammonium salt generally used as an anisotropic etchant for silicon due to its high silicon etching rate.

Application

Tetramethylammonium hydroxide solution (25 wt.% solution in methanol) may be used in the synthesis of zirconium oxides via a modified sol-gel method with potential application as catalyst materials in CO hydrogenation.

Signal Word

Danger

Hazard Classifications

Acute Tox. 2 Dermal - Acute Tox. 2 Oral - Acute Tox. 3 Inhalation - Aquatic Chronic 3 - Eye Dam. 1 - Flam. Liq. 3 - Skin Corr. 1B - STOT RE 1 Dermal - STOT SE 1

Storage Class Code

3 - Flammable liquids

WGK

WGK 2

Flash Point(F)

80.6 °F - closed cup

Flash Point(C)

27 °C - closed cup

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

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Characterization of Zirconia-based catalysts prepared by precipitation, calcination, and modified sol-gel methods.
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Study on anisotropic silicon etching characteristics in various surfactant-added tetramethyl ammonium hydroxide water solutions.
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The characteristic behavior of TMAH water solution for anisotropic etching on both silicon substrate and SiO 2 layer.
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