Pure Borax Powder for UK Trade, Studio and Lab Use
This is genuine borax: sodium tetraborate decahydrate (Na2B4O7·10H2O) at 99.9% purity. It is not a substitute or a blend. The powder is fine, white and free-flowing, dissolves readily in warm water and gives a stable alkaline solution of around pH 9.2. Choose a 900g bag for the workbench or a 3kg bag for regular trade use.
Typical professional applications
- Soldering and brazing flux: keeps gold, silver, brass and copper clean while heating, so solder flows and joints bond properly.
- Pottery and enamelling: a strong low-temperature flux for glazes, frits and glass work.
- Timber conservation: used by restorers as a borate treatment against rot and wood-boring insects.
- Laboratory work: preparing borate buffer solutions and pH reference standards.
- Taxidermy and specimen preparation: helps dry and preserve skins and botanical material.
- Technical cleaning and water treatment: alkaline cleaner for workshops and conditioner for closed heating and cooling loops.
Specification
| Substance | Sodium tetraborate decahydrate (disodium tetraborate) |
|---|---|
| CAS / EC number | 1303-96-4 / 215-540-4 |
| Assay | 99.9% (technical grade) |
| B2O3 content | approx. 36.5–38.5% |
| Form | White crystalline powder, odourless |
| Pack sizes | 900g (approx. 2 lb) and 3kg (approx. 6.6 lb) |
Converting a recipe written for pentahydrate or anhydrous borax? See our guide to borax decahydrate vs pentahydrate vs anhydrous.
Documentation
A Safety Data Sheet comes with every order. A Certificate of Analysis and Declaration of Conformity are available on request for labs, schools and trade accounts.
Who can buy this borax
Borax is classified in Great Britain as Repr. 1B (H360FD: may damage fertility, may damage the unborn child). It is supplied here for professional, industrial and laboratory use only. It is not sold as a household laundry product, a food additive or an ingredient for children’s slime. By ordering you confirm it will be used in a professional or technical setting.
Handling: wear gloves and eye protection, avoid breathing dust, store sealed and out of reach of children. Not for home cleaning: for laundry and household jobs use our borax substitute.
Cleaning at home? Read how to use borax substitute, the household alternative to borax.
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