Tetramethylammonium Hydroxide 25% Solution (TMAH)

Tetramethylammonium Hydroxide Solution, 25 wt.% in Water (TMAH) - 1L

SKU: 331635-1L
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For laboratory, institutional, and professional use only. Not available for residential or personal purchase. Orders are subject to verification.

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Tetramethylammonium hydroxide (TMAH) solution, 25 wt.% in water, is a strong organic base and quaternary ammonium compound widely used in organic synthesis, analytical chemistry, and semiconductor processing. * Laboratory address verification is required

This aqueous TMAH solution is commonly used as:

A strong base in organic reactions

A nucleophilic reagent

Anisotropic silicon etchant in microfabrication

pH adjustment reagent in advanced material synthesis

Catalyst and structure-directing agent in materials chemistry

With high alkalinity (pH >13 at 20 °C), this solution provides consistent base strength and reproducibility for research and industrial applications.

For laboratory and controlled-use environments only.

Chemical Name: Tetramethylammonium hydroxide
Synonyms: TMAH solution
CAS Number: 75-59-2
Linear Formula: (CH₃)₄N(OH)
Molecular Weight: 91.15 g/mol
Concentration: 25 wt.% in H₂O
Form: Liquid
Quality Level: 200
Functional Group: Amine (quaternary ammonium)
Primary Uses: Strong base, silicon etchant, pH adjustment

SPECIFICATIONS

Tetramethylammonium Hydroxide Solution, 25 wt.% in Water

Chemical Formula: (CH₃)₄N(OH)

CAS Number: 75-59-2

Molecular Weight: 91.15 g/mol

Concentration: 25 wt.% in H₂O

Form: Liquid

Quality Level: 200

Physical & Chemical Properties

pH: >13 (20 °C)

Density: 1.016 g/mL at 25 °C

Refractive Index: n20/D 1.3806

Vapor Pressure: 17.5 mmHg (20 °C)

Solubility: Water soluble

Chemical Identifiers

MDL Number: MFCD00008280

Beilstein/REAXYS Number: 3558708

PubChem Substance ID: 24859984

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

InChI Key: WGTYBPLFGIVFAS-UHFFFAOYSA-M

Storage Conditions

Store tightly closed

Protect from CO₂ absorption

Store at controlled room temperature

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