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Tetramethylammonium hydroxide, 25% w/w aq. soln., Thermo Scientific Chemicals
Description
Tetramethylammonium hydroxide is used to produce tetramethyl-ammonium azide. It is used as an anisotropic etchant of silicon, as a basic solvent in the development of acidic photoresist in photolithography process, as a surfactant in the synthesis of ferrofluid and as a polarographic reagent. It finds application in the production of organic silicon, where it is used for computer silicon wafer surface brighteners and as a cleaning agent. It is also involved in the purification of some metallic elements.
This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Scientific Chemicals.
Tetramethylammonium hydroxide is used to produce tetramethyl-ammonium azide. It is used as an anisotropic etchant of silicon, as a basic solvent in the development of acidic photoresist in photolithography process, as a surfactant in the synthesis of ferrofluid and as a polarographic reagent. It finds application in the production of organic silicon, where it is used for computer silicon wafer surface brighteners and as a cleaning agent. It is also involved in the purification of some metallic elements.
Solubility
Miscible with water.
Notes
Air sensitive. Incompatible with strong oxidizing agents, strong acids, aluminum, alkali metals, strong oxidizing agents, acids, acid chlorides, acid anhydrides and halogens.

Specifications
Specifications
Density | 1.014 |
Boiling Point | ∼102°C |
Refractive Index | 1.384 |
Linear Formula | (CH3)4NOH |
Quantity | 500 mL |
UN Number | UN1835 |
Beilstein | 3558708 |
Sensitivity | Air Sensitive |
Merck Index | 14,9224 |
Solubility Information | Miscible with water. |
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Safety and Handling
Hazard Category | H301-H310-H314-H370-H372 |
Hazard Statement | GHS H Statement H300-H310-H370-H372-H314 Fatal if swallowed. Fatal in contact with skin. Causes damage to organs. Causes damage to organs through prolonged or repeated exposure. Causes severe skin burns and eye damage. |
Precautionary Statement | P260-P264b-P270-P280-P303+P361+P353-P304+P340-P305+P351+P338-P310-P330-P331-P363-P501c |
DOTInformation | Transport Hazard Class: 8; Packing Group: II; Proper Shipping Name: TETRAMETHYLAMMONIUM HYDROXIDE SOLUTION |
EINECSNumber | 200-882-9 |
RTECSNumber | PA0875000 |
TSCA | Yes |
Recommended Storage | Ambient temperatures; Store under Nitrogen |
RUO – Research Use Only
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