MilliporeSigma
All Photos(2)

331635

Sigma-Aldrich

Tetramethylammonium hydroxide solution

25 wt. % in H2O

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

vapor pressure

17.5 mmHg ( 20 °C)

Quality Level

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

Looking for similar products? Visit Product Comparison Guide

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).

Packaging

250 mL in glass bottle
1 L in glass bottle

Signal Word

Danger

Hazard Classifications

Acute Tox. 2 Dermal - Acute Tox. 2 Oral - Aquatic Chronic 2 - Eye Dam. 1 - Skin Corr. 1 - 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

Certificate of Analysis

Enter Lot Number to search for Certificate of Analysis (COA).

Certificate of Origin

Enter Lot Number to search for Certificate of Origin (COO).

More Documents

SDS

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

Contact Technical Service