331635

Tetramethylammonium hydroxide solution

25 wt. % in H₂O

• Synonym(s): TMAH solution
• Linear Formula: (CH₃)₄N(OH)
• CAS Number: 75-59-2
• Molecular Weight: 91.15
• Beilstein/REAXYS Number: 3558708
• MDL number: MFCD00008280
• UNSPSC Code: 12352100
• PubChem Substance ID: 24859984
• NACRES: NA.21

Properties

• 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

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).

Safety Information

• pictograms: 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_germany: WGK 3
• flash_point_f: Not applicable
• flash_point_c: Not applicable
• ppe: Faceshields, Gloves, Goggles, type ABEK (EN14387) respirator filter