Molekula
Sodium tetraborate decahydrate (Borax decahydrate)
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
Sodium tetraborate decahydrate, commonly known as borax decahydrate, is a white, crystalline powder used in detergents, water treatment, and as a flux in metallurgy. It is also employed in laboratory settings for buffer preparation and as a preservative. Available in CAS 1303-96-4, with molecular formula Na2B4O7·10H2O and molecular weight 381.37 g/mol. Stored at ambient temperatures. Signal word: Danger. Molekula supplies Sodium tetraborate decahydrate 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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500 g — £18.00 per pack ex VAT · £21.60 inc. VAT
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1 kg — £29.50 per pack ex VAT · £35.40 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 crystalline powder |
| Na2O | 15.8-16.9% |
| B2O3 | 36.5-38.1% |
| Iron (Fe) | <10ppm |
| Sieve residue 0.315mm | <2% |
| Sulphates (SO4)(2-) | <200ppm |
| Equivalent Na2B4O7.10H2O (%) | 99.9 – 104.4 |
| Chlorine (Cl) | <100ppm |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Base |
For research use only. Not for human use.
Identification
| Property | Value |
|---|---|
| SKU | 37358764 |
| CAS Number | 1303-96-4 |
| Molecular Formula | Na2B4O7·10H2O |
| Molecular Weight | 381.37 |
| SMILES | B1(OB2OB(OB(O1)O2)[O-])[O-].O.O.O.O.O.O.O.O.O.O.[Na+].[Na+] |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 2840.19.0000 |
| Tariff Code | 2840199000 |
Safety & GHS
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Health Hazard
GHS07
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Serious Health Hazard
GHS08
Hazard statements
- H319 Causes serious eye irritation
- H360FD May damage fertility. May damage the unborn child.
Precautionary statements
- P260 Do not breathe dust/fume/gas/mist/vapours/spray
- P263 Avoid contact during pregnancy/while nursing
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
- P308+313 IF exposed or concerned: Get medical advice/attention
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Portuguese, Russian, 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
No alternate names recorded for this product.
Frequently asked questions
What is sodium tetraborate decahydrate used for?
It is commonly used in detergents, water treatment, and as a flux in metallurgy. It also serves as a buffering agent in laboratory applications.
What is the chemical formula and molecular weight?
The formula is Na2B4O7·10H2O with a molecular weight of 381.37 g/mol.
How should sodium tetraborate decahydrate be stored?
Store at ambient temperature in a dry, well-ventilated area away from incompatible materials.
What grade is available?
Available in laboratory grade; other grades may be available upon request.
Can Molekula supply it in bulk?
Yes, Molekula can supply sodium tetraborate decahydrate in bulk quantities—please contact sales for details.
What documentation comes with the order?
Each order includes a Certificate of Analysis (CoA) and Safety Data Sheet (SDS) with the shipment.
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.