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331635

Tetramethylammonium hydroxide solution

25 wt. % in H₂O, solution

Synonym(s):

TMAH solution

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About This Item

Linear Formula:

(CH₃)₄N(OH)

CAS Number:

Molecular Weight:

91.15

NACRES:

NA.21

PubChem Substance ID:

UNSPSC Code:

12352100

MDL number:

Beilstein/REAXYS Number:

3558708

Concentration:

25 wt. % in H₂O

Form:

liquid

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Properties

Product Name

Tetramethylammonium hydroxide solution, 25 wt. % in H₂O

vapor pressure

17.5 mmHg ( 20 °C)

Quality Level

form

liquid

reaction suitability

core: ammonium

concentration

25 wt. % in H₂O

refractive index

n20/D 1.3806

pH

>13 (20 °C)

solubility

water: soluble

density

1.016 g/mL at 25 °C

functional group

amine

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

Description

General description

Tetramethylammonium hydroxide solution is commonly used as a strong base and nucleophilic source in organic synthesis reactions.

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).

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pictograms

Skull and crossbones

Health hazard

Corrosion

Environment

GHS06,GHS08,GHS05,GHS09

signalword

Danger

hcodes

H300 + H310,H314,H370,H372,H411

pcodes

P260 - P273 - P280 - P303 + P361 + P353 - P304 + P340 + P310 - P305 + P351 + P338

Hazard Classifications

Acute Tox. 1 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, Liver,thymus

Storage Class

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

ppe

Faceshields, Gloves, Goggles, type ABEK (EN14387) respirator filter

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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)

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)

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)

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Global Trade Item Number

SKU	GTIN
331635-1L	04061837548697
331635-250ML	04061837548703