Molekula
Tetramethylammonium hydroxide 10% 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 10% in water is a quaternary ammonium compound used as a strong organic base in chemical synthesis, catalysis, and phase-transfer reactions, particularly in pharmaceutical and polymer manufacturing. It is also used to develop photoresists in semiconductor lithography, as an anisotropic etchant for silicon, and as a buffer, titrant or ion-pair reagent in chemical analysis. It is supplied as a clear, colorless solution with a 10% w/w concentration in water. CAS 75-59-2, molecular formula (CH3)4N(OH), molecular weight 91.15 g/mol. Store at ambient temperatures. Signal word: Danger. Molekula supplies Tetramethylammonium hydroxide 10% 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.
Pricing & pack sizes
Pack sizes & pricing
Pricing on request — packs available from research to bulk quantities.
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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.
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Specifications
| Property | Value |
|---|---|
| Appearance | Clear colourless liquid |
| Refractive Index | 1.350 - 1.354 (@ 20°C) |
| Assay (Titration) | 9.0 - 11.0% (Titrate with HCl) |
| Identification (NMR) | Conforms to structure |
| Identification (RAMAN) | Conforms to reference |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Transport Class | 8 (6.1) |
| Packing Group | II |
| Acidity | Base |
Identification
| Property | Value |
|---|---|
| SKU | 90036707 |
| 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 | 29239001 |
| Tariff Code | 2923900090 |
Safety & GHS
-
Corrosive
GHS05
-
Toxic
GHS06
-
Serious Health Hazard
GHS08
-
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
- 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, 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 (TMAH) 10% in water commonly used for?
TMAH is primarily used in semiconductor manufacturing for photoresist stripping, as a developer in electron-beam resist processing, and in analytical chemistry for capillary electrophoresis.
What is the molecular formula and molecular weight of this product?
The molecular formula is **(CH₃)₄N(OH)**, and the molecular weight is **91.15 g/mol** (anhydrous base).
How should tetramethylammonium hydroxide (10% solution) be stored?
Store at **ambient temperature** in a tightly sealed container, away from incompatible substances like strong acids or oxidizing agents.
What purity grades are available for this product?
Molekula supplies this product as a **10% aqueous solution**, typically in **analytical or electronic-grade purity**—please confirm your specific application requirements.
Can Molekula supply tetramethylammonium hydroxide in bulk quantities?
Yes, we offer **bulk packaging options** (e.g., 5L, 20L, or larger drums) for this product—contact us for pricing and lead times.
What documentation is provided with an order of tetramethylammonium hydroxide?
Each order includes a **Certificate of Analysis (CoA)**, **Material Safety Data Sheet (MSDS/SDS)**, and **batch-specific documentation** for traceability.
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.