Molekula
Tetramethylammonium hydroxide pentahydrate
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 1999 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Tetramethylammonium hydroxide pentahydrate is a strong organic base used in semiconductor manufacturing, organic synthesis, and as a catalyst in various chemical reactions. It is supplied as a white crystalline solid (melting point 67–70°C) with a molecular weight of 181.23 g/mol, CAS number 10424-65-4, and molecular formula (CH3)4N(OH)·5H2O. Store at ambient temperature. Hazardous: signal word Danger.
Molekula supplies Tetramethylammonium hydroxide pentahydrate at ≥99% purity in 25 g and 500 g packs, from £48.72 inc. VAT. It is in stock for same-day dispatch. Every batch ships with a certificate of analysis, and safety data sheets are available in 6 languages. Larger quantities, up to multi-tonne, are quoted on request.
Example image for illustration only. Other packaging and pack sizes are available.
Often bought together
Pricing & pack sizes
In stock — same-day dispatch
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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25 g — £40.60 per pack ex VAT · £48.72 inc. VAT
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500 g — £1,660.00 per pack ex VAT · £1,992.00 inc. VAT
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 | White solid |
| Melting Point | 67°C - 70°C |
| Identification | Conforms to reference |
| Purity | ≥99% |
| Alkali content | ≥46.5% |
| Carbonate (CO3(2-)) | ≤1% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Transport Class | 8 |
| Packing Group | II |
| Acidity | Base |
Identification
| Property | Value |
|---|---|
| SKU | 90030491 |
| CAS Number | 10424-65-4 |
| IUPAC Name | tetramethylazanium;hydroxide;pentahydrate |
| Molecular Formula | (CH3)4N(OH).5H2O |
| Molecular Weight | 181.23 |
| Exact Mass | 181.1525 |
| SMILES | C[N+](C)(C)C.O.O.O.O.O.[OH-] |
| InChIKey | MYXKPFMQWULLOH-UHFFFAOYSA-M |
| InChI | InChI=1S/C4H12N.6H2O/c1-5(2,3)4;;;;;;/h1-4H3;6*1H2/q+1;;;;;;/p-1 |
| PubChem CID | 82620 |
| UN Number | UN3423 |
| REACH Code | Y110 |
| HTS Code | 29239001 |
| Tariff Code | 2923900090 |
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
- H290 May be corrosive to metals
- 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
- 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
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
- P310 Immediately call a POISON CENTER or doctor/physician
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.
Quality certificates
Molekula Group is certified to ISO 9001:2015 (quality) and ISO 14001:2015 (environmental management), audited by a UKAS-accredited body. Both certificates are valid to 17 May 2028.
Synonyms
- Ammonium, tetramethyl-, hydroxide, pentahydrate
- Methanaminium, N,N,N-trimethyl-, hydroxide, hydrate (1:1:5)
- Methanaminium, N,N,N-trimethyl-, hydroxide, pentahydrate
- N,N,N-Trimethylmethanaminium hydroxide--water (1/1/5)
- Tetrametanoamonio hydroxido
- Tetramethylammoniumhydroxid
- tetramethylazanium pentahydrate hydroxide
- tetramethylazanium;hydroxide;pentahydrate
- Tetrametiloamonio hydroxido
Frequently asked questions
What is tetramethylammonium hydroxide pentahydrate used for?
It is primarily used as a strong base in organic synthesis, particularly in the synthesis of quaternary ammonium compounds and as a reagent in the production of semiconductors and pharmaceuticals.
What is the chemical formula and molecular weight?
The formula is (CH3)4N(OH)·5H2O and the molecular weight is 181.23 g/mol.
How should tetramethylammonium hydroxide pentahydrate be stored?
It should be stored at ambient temperature, protected from moisture and direct sunlight, and kept in a tightly sealed container.
What grade is available?
The product is specified at a purity of ≥99%, with an alkali content of ≥46.5% and carbonate content of ≤1%.
Can Molekula supply this in bulk?
Yes, we can supply tetramethylammonium hydroxide pentahydrate in bulk quantities; please contact our sales team for pricing and availability.
What documentation comes with the order?
Each order includes a Certificate of Analysis (CoA) and Safety Data Sheet (SDS); additional documentation can be provided upon request.
Where can I buy Tetramethylammonium hydroxide pentahydrate?
Directly from Molekula, which lists Tetramethylammonium hydroxide pentahydrate in 25 g and 500 g packs from £48.72 inc. VAT, with a certificate of analysis for every batch. Larger quantities are quoted on request. Molekula's offices: United Kingdom, France, Spain, Germany, Italy, United States and China.
Is Tetramethylammonium hydroxide pentahydrate dangerous goods for shipping?
Yes. Tetramethylammonium hydroxide pentahydrate ships as dangerous goods: UN3423, class 8, packing group II.
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.