Molekula
Sodium tetraborate anhydrous
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 anhydrous (borax) is a white, water-soluble powder primarily used as a buffering agent, flame retardant, and cleaning booster in detergents, cosmetics, and industrial applications. It also serves as a pH stabilizer in chemical formulations and a preservative in adhesives. Industrially, it is widely used to make glass, ceramic glazes and enamels, as a flux for soldering metals, and as a preservative protecting wood against fungal decay. This anhydrous form has a CAS number of 1330-43-4, a molecular formula of B4Na2O7, and a molecular weight of 201.22 g/mol. It is stored at ambient conditions but requires careful handling due to its **Danger** classification under GHS. Molekula supplies sodium tetraborate anhydrous 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.
-
250 g — £40.00 per pack ex VAT · £48.00 inc. VAT
-
500 g — £53.00 per pack ex VAT · £63.60 inc. VAT
-
1 kg — £62.10 per pack ex VAT · £74.52 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 |
| Assay | ≥99.5% |
| Impurities | ≤0.005% Insoluble matter |
| Iron (Fe) | ≤0.005% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Neutral |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Appearance | Colorless glassy solid; hygroscopic |
| Odour | Odorless |
| Melting Point | 743 °C |
| Boiling Point | 1575 °C (Decomposes) |
| Density | 2.4 (relative, water = 1) |
| Vapour Pressure | 0 mmHg (approx) |
| Refractive Index | 1.5010 |
Source: PubChem CID 10219853 (HSDB, The National Institute for Occupational Safety and Health (NIOSH), ICSC)
Identification
| Property | Value |
|---|---|
| SKU | 21217888 |
| CAS Number | 1330-43-4 |
| IUPAC Name | disodium;3,7-dioxido-2,4,6,8,9-pentaoxa-1,3,5,7-tetraborabicyclo[3.3.1]nonane |
| EC Number | 215-540-4 |
| Molecular Formula | B4Na2O7 |
| Molecular Weight | 201.22 |
| Exact Mass | 201.9812 |
| SMILES | B1(OB2OB(OB(O1)O2)[O-])[O-].[Na+].[Na+] |
| InChIKey | UQGFMSUEHSUPRD-UHFFFAOYSA-N |
| InChI | InChI=1S/B4O7.2Na/c5-1-7-3-9-2(6)10-4(8-1)11-3;;/q-2;2*+1 |
| PubChem CID | 10219853 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 2840110000 |
| Tariff Code | 2840199000 |
Safety & GHS
-
Health Hazard
GHS07
-
Serious Health Hazard
GHS08
Hazard statements
- H319 Causes serious eye irritation
- H360FD May damage fertility. May damage the unborn child.
Precautionary statements
- P201 Obtain special instructions before use
- 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, 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
- Anhydrous borax
- Borax Anhydrous
- Borax glass
- Borax, fused
- Boron sodium oxide (B4Na2O7)
- Dehybor
- Fused borax
- Granubor
- Sodium biborate
- Sodium pyroborate
Frequently asked questions
What is sodium tetraborate anhydrous commonly used for?
Sodium tetraborate anhydrous is primarily used as a buffer in pH regulation, a flame retardant, and in detergents, cosmetics, and antiseptics.
What is the chemical formula and molecular weight of sodium tetraborate anhydrous?
The chemical formula is **B₄Na₂O₇**, and the molecular weight is **201.22 g/mol**.
How should sodium tetraborate anhydrous be stored?
Store at **ambient temperature** in a cool, dry place, away from incompatible substances.
What grades of sodium tetraborate anhydrous does Molekula supply?
Molekula supplies **technical/industrial grade** sodium tetraborate anhydrous; contact us for specifications.
Can Molekula supply sodium tetraborate anhydrous in bulk quantities?
Yes, we offer bulk quantities—please inquire for minimum order quantities and pricing.
What documentation comes with an order of sodium tetraborate anhydrous?
Each order includes a **Certificate of Analysis (CoA)**, Safety Data Sheet (SDS), and a packing list.
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.