221732 Sigma-Aldrich

Sodium tetraborate

Green Alternative


Synonym: Borax, fused



Related Categories 12 Principles Aligned Products, Chemical Synthesis, Greener Alternative Products, Greener Synthetic Reagents, Inorganic Salts,
Quality Level   200
assay   99%
greener alternative product characteristics   Catalysis
Learn more about the Principles of Green Chemistry.
mp   741 °C (lit.)
density   2.367 g/mL at 25 °C (lit.)
SMILES string   [Na+].[Na+].[O-]B1Ob2ob([O-])ob(O1)o2
InChI   1S/B4O7.2Na/c5-1-7-3-9-2(6)10-4(8-1)11-3;;/q-2;2*+1


General description

We are committed to bringing you Greener Alternative Products, which adhere to one or more of The 12 Principles of Greener Chemistry. This product has been enhanced for catalytic efficiency. Find details here.


Co-catalyst for TEMPO/NaOCl oxidation of alcohols in greener, non-chlorinated solvents.

Towards greener solvents for the bleach oxidation of alcohols catalysed by stable N-oxy radicals


100, 500 g in poly bottle

Safety & Documentation

Safety Information

Signal word 
Hazard statements 
NONH for all modes of transport
WGK Germany 
Flash Point(F) 
Not applicable
Flash Point(C) 
Not applicable


Certificate of Analysis (COA)

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Certificate of Origin (COO)

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Frequently Asked Questions

Which document(s) contains shelf-life or expiration date information for a given product?
If available for a given product, the recommended re-test date or the expiration date can be found on the Certificate of Analysis.
How do I get lot-specific information or a Certificate of Analysis?
The lot specific COA document can be found by entering the lot number above under the "Documents" section.
How do I find price and availability?
There are several ways to find pricing and availability for our products. Once you log onto our website, you will find the price and availability displayed on the product detail page. You can contact any of our Customer Sales and Service offices to receive a quote. USA customers: 1-800-325-3010 or view local office numbers.
What is the Department of Transportation shipping information for this product?
Transportation information can be found in Section 14 of the product's (M)SDS.To access the shipping information for this material, use the link on the product detail page for the product.
Is Product 221732, Sodium tetraborate, soluble in water?
Per the chemicals encyclopedia published by the Royal Society of Chemistry this product is slow to dissolve in water and may require heat at 40°C and stirring. We have tested the solubility at 33 mg/mL water.
Do we offer a more water soluble Sodium tetraborate?
Product No. S9640, Sodium tetraborate decahydrate, is soluble in water at 62 mg/mL or 160 mM. If you use hot water you can get a 4.4 M solution.
What is the appearance of Product 221732,Sodium tetraborate?
This product is a powder. It may be either crystalline or granular.
Is Product 221732,Sodium tetraborate, a fused borax?
Yes, Product No. 221732 is a fused borax.
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