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Tetramethylammonium hydroxide

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Tetramethylammonium hydroxide Basic information

Product Name:
Tetramethylammonium hydroxide
Synonyms:
  • N,N,N-TRIMETHYLMETHANAMINIUM HYDROXIDE
  • TETRAMETHYLAMMONIUM HYDROXIDE
  • TMAH
  • Tetramethylammoniumhydroxide,25%soln.inmethanol
  • Tetramethylammoniumhydroxide,25%w/wAqueousSolution,99.5%(metalsbasis)
  • TETRAMETHYLAMMONIUM HYDROXIDEOL
  • Tetramethylammonium hydroxide, 10% in water
  • Tetramethylammonium hydroxide, 25 wt% in methanol
CAS:
75-59-2
MF:
C4H13NO
MW:
91.15
EINECS:
200-882-9
Product Categories:
  • Analytical Chemistry
  • Esterification & Alkylation (GC Derivatizing Reagents)
  • quarternary ammonium bases
  • Ammonium Hydroxides (Quaternary)
  • GC Derivatizing Reagents
  • Onium Hydroxides (GC Derivatizing Reagents)
  • Quaternary Ammonium Compounds
  • Atomic Absorption Spectroscopy (AAS)
  • Digestion Reagents
  • Reference Material Perchloric acidTitration
  • Base SolutionsVolumetric Solutions
  • Organic BasesEssential Chemicals
  • Reagent Grade
  • NULL
  • ACS GradeChemical Synthesis
  • Essential Chemicals
  • Organic Bases
  • Routine Reagents
  • Synthetic Reagents
  • Electronic Chemicals
  • Micro/Nanoelectronics
  • Semiconductor Grade Chemicals
  • Reference Material Hydrochloric acidTitration
  • Chemical Synthesis
  • Pure Reagents for Wet Digestion (Trace SELECT)
  • AnionicHPLC
  • Chromatography/CE Reagents
  • Ion Pair
  • Ion Pair Reagents
  • Ion Pair Reagents - Anionic Concentrate
  • By Reference Material
  • Solutions for non-aqueous titrations
  • Volumetric Solutions
  • Base ConcentratesConcentrates (e.g. FIXANAL)
  • Concentrates (e.g. FIXANAL)
  • Reference Material Hydrochloric acid
  • Titration
Mol File:
75-59-2.mol
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Tetramethylammonium hydroxide Chemical Properties

Melting point:
°C
Boiling point:
110 °C
Density 
0.866 g/mL at 25 °C
vapor pressure 
17.5 mm Hg ( 20 °C)
refractive index 
n20/D 1.384
Flash point:
80 °F
storage temp. 
Store below +30°C.
form 
Solution
color 
APHA: ≤10
PH
>13 (H2O, 20°C)
Water Solubility 
Soluble in water.
Sensitive 
Air Sensitive
Merck 
14,9224
BRN 
3558708
Stability:
Stable. Flammable. Incompatible with strong oxidizing agents, strong acids.
InChIKey
WGTYBPLFGIVFAS-UHFFFAOYSA-M
CAS DataBase Reference
75-59-2(CAS DataBase Reference)
EPA Substance Registry System
Tetramethylammonium hydroxide (75-59-2)
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Safety Information

Hazard Codes 
C,T,F,T+,Xn
Risk Statements 
24/25-34-20/21/22-39/23/24/25-23/24/25-10-21/22-25-21-11-67-36-52-48/24-27/28-23-35-36/38
Safety Statements 
45-36/37/39-26-16-36/37-28
RIDADR 
UN 3286 3/PG 2
WGK Germany 
1
RTECS 
PA0875000
4.4-10-34
TSCA 
Yes
HazardClass 
3
PackingGroup 
II
HS Code 
29239000
Hazardous Substances Data
75-59-2(Hazardous Substances Data)

MSDS

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Tetramethylammonium hydroxide Usage And Synthesis

Description

Tetramethylammonium hydroxide is a solid in the hydrated form or a colorless liquid with a strong ammonia-like odor. It is soluble in water, and corrosive to metals and tissue.

Chemical Properties

colourless to yellow liquid

Uses

Industry
Application
Role/benefit
Organic silicon
Production of dimethyl silicone oil, organic silicon resin, silicon rubber, etc.
Catalyst/removed easily; no pollution to the products
Chemical analysis
Polarography experiment
Polarographic reagent
Thermochemolysis to study fungal degradation of wood
Analytical reagent
Chemical purification
Removal of metal elements
Ash free alkali/source of base; make the metal elements precipitated
Electron
Production of computer silicon chip
Brightening agent; anisotropic etching agent; cleaning agent; photoresist developer
Printing of circuit board
Cleaning agent
Semiconductor manufacturing
Chemical stripper
Others
Synthesis of ferrofluid
Surfactant/ inhibit nanoparticle aggregation
Synthesis of zeolite
Structure directing agent
 

Reactivity Profile

Tetramethylammonium hydroxide acts like a base. Bases are chemically similar to sodium hydroxide (NaOH) or sodium oxide (Na2O). They neutralize acids exothermically to form salts plus water. When soluble in water they give solutions having a pH greater than 7.0. Mixing these materials with water can generate troublesome amounts of heat as the base is dissolved or diluted. Bases react with certain metals (such as aluminum and zinc) to form oxides or hydroxides of the metal and generate gaseous hydrogen. Bases may initiate polymerization reactions in polymerizable organic compounds, especially epoxides). They may generate flammable and/or toxic gases with ammonium salts, nitrides, halogenated organics, various metals, peroxides, and hydroperoxides. Materials of this group often serve as catalysts.

Hazard

Strong irritant to skin and tissue.

Health Hazard

TOXIC; inhalation, ingestion or skin contact with material may cause severe injury or death. Contact with molten substance may cause severe burns to skin and eyes. Avoid any skin contact. Effects of contact or inhalation may be delayed. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause pollution.

Fire Hazard

Combustible material: may burn but does not ignite readily. When heated, vapors may form explosive mixtures with air: indoors, outdoors and sewers explosion hazards. Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated. Runoff may pollute waterways. Substance may be transported in a molten form.

Safety Profile

Poison by subcutaneous route. A powerful caustic. A corrosive irritant to skin, eyes, and mucous membranes. When heated to decomposition it emits toxic fumes of NOx and NH3.

Purification Methods

It is freed from chloride ions by passage through an ion-exchange column (e.g. Amberlite IRA-400, prepared in its OH-form by passing 2M NaOH until the effluent is free from chloride ions, then washed with distilled H2O until neutral). A modification, to obtain carbonate-free hydroxide, uses the method of Davies and Nancollas [Nature 165 237 1950]. [Beilstein 4 IV 145.]

References

1.https://en.wikipedia.org/wiki/Tetramethylammonium_hydroxide#Uses
2.http://sacheminc.com/other-chemicals/tetramethylammonium-hydroxide-tmah/
3.https://www.fs.usda.gov/treesearch/pubs/15506
4.https://www.concordia.ca/content/dam/concordia/services/safety/docs/EHS-DOC-020_TMAHGuidelines.pdf
5./ChemicalProductProperty_EN_CB2854236.htm

Tetramethylammonium hydroxide Preparation Products And Raw materials

Preparation Products

Tetramethylammonium hydroxideSupplier

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