Molekula
Hexamethyldisilazane (HMDS)
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
Hexamethyldisilazane (HMDS) is a volatile, colorless liquid used primarily as a silylating agent in organic synthesis and as a drying agent in analytical chemistry. It is also employed in semiconductor manufacturing and as a reagent in the preparation of silanes. CAS: 999-97-3, Molecular Formula: (CH3)3SiNHSi(CH3)3, Molecular Weight: 161.39 g/mol, Storage: Ambient, Signal Word: Danger. Molekula supplies Hexamethyldisilazane 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
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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100 mL — £55.00 per pack ex VAT · £66.00 inc. VAT
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500 mL — £154.00 per pack ex VAT · £184.80 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 | Clear colourless liquid |
| Assay GC | ≥98.0% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Flash Point | 11 °C |
| Transport Class | 3 (6.1) (8) |
| Packing Group | II |
| Acidity | Base |
Identification
| Property | Value |
|---|---|
| SKU | 21242140 |
| CAS Number | 999-97-3 |
| Molecular Formula | (CH3)3SiNHSi(CH3)3 |
| Molecular Weight | 161.39 |
| SMILES | N([Si](C)(C)C)[Si](C)(C)C |
| UN Number | UN3286 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 29319090 |
| Tariff Code | 2931900090 |
Safety & GHS
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Flammable
GHS02
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Corrosive
GHS05
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Toxic
GHS06
Hazard statements
- EUH029 Contact with water liberates toxic gas
- H225 Highly flammable liquid and vapour
- H302 Harmful if swallowed
- H311 Toxic in contact with skin
- H314 Causes severe skin burns and eye damage
- H331 Toxic if inhaled
- H412 Harmful to aquatic life with long lasting effects
Precautionary statements
- P210 Keep away from heat/sparks/open flames/hot surfaces - No smoking
- 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+312 IF SWALLOWED: Call a POISON CENTER or doctor/physician if you feel unwell
- P302+352 IF ON SKIN: Wash with soap and water
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
Documents
Safety Data Sheets (SDS)
Available in English, French, German.
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
No alternate names recorded for this product.
Frequently asked questions
What is Hexamethyldisilazane (HMDS) used for?
HMDS is primarily used as a silylating agent in organic synthesis and as a surface treatment for improving adhesion in semiconductor manufacturing.
What is the chemical formula and molecular weight of HMDS?
The formula is (CH3)3SiNHSi(CH3)3 with a molecular weight of 161.39 g/mol.
How should HMDS be stored?
HMDS should be stored at ambient temperature, away from moisture and incompatible materials.
What grade of HMDS does Molekula supply?
Molekula supplies HMDS in high-purity grade suitable for laboratory and industrial applications.
Can Molekula supply HMDS in bulk quantities?
Yes, Molekula can supply HMDS in bulk quantities—please contact our sales team for pricing and availability.
What documentation comes with an HMDS order?
Each order includes a Certificate of Analysis (CoA) and Safety Data Sheet (SDS) compliant with GHS standards.
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.