Molekula
Tetramethylammonium hydroxide, 25% solution in water
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Tetramethylammonium hydroxide, 25% solution in water, is a strong organic base used in semiconductor manufacturing, organic synthesis, and as a catalyst in various chemical reactions. It is a clear, colorless to pale yellow liquid with a pungent odor. CAS: 75-59-2, Molecular formula: (CH3)4NOH, Molecular weight: 91.15 g/mol. Store at ambient temperature. Hazardous: signal word Danger. Molekula supplies Tetramethylammonium hydroxide, 25% solution in water from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Often bought together
Pricing & pack sizes
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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1 L — $285.00 per pack
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500 mL — $191.90 per pack
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100 g — $56.10 per pack
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1 kg — $284.00 per pack
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | Clear Colourless - Yellow liquid |
| Purity | 24-26% |
| Iron (Fe) | 1ppm max |
| Lead (Pb) | 0.01ppm max |
| Arsenic (As) | 0.01ppm max |
| Calcium (Ca) | 1.5ppm max |
| Copper (Cu) | 0.1ppm max |
| Magnesium (Mg) | 0.1ppm max |
| Potassium (K) | 0.1ppm max |
| Zinc (Zn) | 0.2ppm max |
| Sodium (Na) | 0.5%ppm max |
| Silver (Ag) | 0.01ppm max |
| Aluminium (Al) | 0.5ppm max |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Transport Class | 8 |
| Packing Group | II |
| Acidity | Base |
Identification
| Property | Value |
|---|---|
| SKU | 27489600 |
| CAS Number | 75-59-2 |
| IUPAC Name | tetramethylazanium hydroxide |
| EC Number | 200-882-9 |
| Molecular Formula | (CH3)4N(OH) |
| Molecular Weight | 91.15 |
| Exact Mass | 91.0997 |
| SMILES | C[N+](C)(C)C.[OH-] |
| InChIKey | WGTYBPLFGIVFAS-UHFFFAOYSA-M |
| InChI | InChI=1S/C4H12N.H2O/c1-5(2,3)4;/h1-4H3;1H2/q+1;/p-1 |
| PubChem CID | 60966 |
| UN Number | UN1835 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 2923.90.0100 |
| Tariff Code | 2923900010 |
Safety & GHS
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Corrosive
GHS05
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Toxic
GHS06
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Serious Health Hazard
GHS08
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Hazardous to the Environment
GHS09
Hazard statements
- H300 Fatal if swallowed
- H310 Fatal in contact with skin
- H314 (sub cat. 1B) Causes severe skin burns and eye damage
- H370 Causes damage to organs
- H372 Causes damage to organs through prolonged or repeated exposure
- H411 Toxic to aquatic life with long lasting effects
Precautionary statements
- P260 Do not breathe dust/fume/gas/mist/vapours/spray
- P273 Avoid release to the environment
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P301+310 IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician
- P303+361 IF ON SKIN (or hair): Remove immediately all contaminated clothing. Rinse with water/shower
- P304+340 IF INHALED: Remove victim to fresh air and keep at rest in a position comfortable for breathing
- P308+313 IF exposed or concerned: Get medical advice/attention
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Portuguese, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- Ammonium, tetramethyl-, hydroxide
- Hydroxyde de tetramethylammonium
- Methanaminium, N,N,N-trimethyl-, hydroxide
- Methanaminium, N,N,N-trimethyl-, hydroxide (1:1)
- N,N,N-trimethylmethanaminium hydroxide
- NMD 3
- NMW-W
- tetramethylazanium;hydroxide
- TMAH
- TMAOH
Frequently asked questions
What is tetramethylammonium hydroxide used for?
It is commonly used as a strong base in organic synthesis, particularly in the Hofmann elimination and as a catalyst in various reactions.
What is the chemical formula and molecular weight?
The formula is (CH3)4N(OH) with a molecular weight of 91.15 g/mol.
How should tetramethylammonium hydroxide be stored?
It should be stored at ambient temperature, away from light and incompatible materials.
What grade is available for this product?
This product is available as a 25% aqueous solution, typically used for laboratory and industrial applications.
Can Molekula supply this in bulk?
Yes, Molekula can supply tetramethylammonium hydroxide in bulk quantities—please contact our sales team for details.
What documentation comes with the order?
Each order includes a Certificate of Analysis (CoA) and Safety Data Sheet (SDS) upon request.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.