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 versatile borate mineral used primarily as a buffer in chemical laboratories, a flame retardant, and in household cleaning products, detergents, and water softeners. It also serves as a precursor in the manufacture of borosilicate glass and as a pesticide. The chemical has a CAS number of 1303-96-4, a molecular formula of Na2B4O7·10H2O, and a molecular weight of 381.37. It is stored at ambient conditions but requires careful handling due to its classification as a dangerous substance that causes serious eye irritation and may damage fertility and the unborn child. 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.
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 kg — £80.00 per pack ex VAT · £96.00 inc. VAT
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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.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | White powder |
| Chloride (Cl-) | ≤ 70ppm |
| Na2O | 16.24 - 17.14% |
| B2O3 | ≥ 36.47% |
| Iron (Fe) | ≤ 10ppm |
| Identification (IR) | Conforms to Reference |
| Sulphates (SO4)(2-) | ≤ 135ppm |
| Equivalent Na2B4O7.10H2O (%) | 99.90 - 105.45% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Base |
Identification
| Property | Value |
|---|---|
| SKU | 90033806 |
| 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
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 commonly used for?
It is widely used as a buffer in pH regulation, a flux in metallurgy, a cleaning agent in detergents, and in laboratory applications like buffer preparation and flame retardants.
What is the chemical formula and molecular weight of sodium tetraborate decahydrate?
The formula is Na₂B₄O₇·10H₂O, and the molecular weight is 381.37 g/mol.
What safety classification does this product have?
The product is classified with the Signal Word: Danger, indicating significant hazards requiring careful handling.
How should sodium tetraborate decahydrate be stored?
Store in a dry, well-ventilated area at ambient temperature, away from incompatible substances like strong acids or oxidizers.
Does Molekula offer this product in bulk quantities?
Yes, Molekula supplies sodium tetraborate decahydrate in bulk quantities upon request, with flexible packaging options.
What documentation is provided with an order of sodium tetraborate decahydrate?
Each order includes a Certificate of Analysis (CoA), Material Safety Data Sheet (MSDS), and a product specification sheet.
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.