FREE UK DELIVERY · 99.9% PURE · SDS INCLUDED
Borax Powder UK – 99.9% Pure Sodium Tetraborate
Technical grade borax (sodium tetraborate decahydrate) for trade, industrial and laboratory use, in 900g and 3kg packs with free delivery to the UK in 3–7 working days. Every order ships with the Safety Data Sheet, and Certificates of Analysis are available on request.
Free UK delivery
3–7 working days
14-day returns
on unopened items
SDS included
with every order
99.9% pure
technical grade
Shop Borax Powder
Pure borax for professional use, plus a household borax substitute for laundry and cleaning. Buy 2 or more packs of borax and save 15%.
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Borax Powder – 99.9% Pure Sodium Tetraborate Decahydrate (Technical Grade)
Borax Powder Price range: £17.99 through £31.99 -
Borax Substitute Double Pack (1800g / 60 Washes) – Natural Laundry Booster & Eco Detergent
Borax Substitute Price range: £17.99 through £33.99
What Is Borax?
Borax is the common name for sodium tetraborate decahydrate (Na2B4O7·10H2O), a naturally occurring boron mineral that forms soft white crystals. Ground into a fine white borax powder, it dissolves in warm water to give a mildly alkaline solution (around pH 9.2–9.5), which is why it has been used for well over a century as a flux, buffer, preservative and cleaning aid.
Most of the world’s borax is mined in the USA and Turkey and refined into different grades. Our product is technical grade borax, 99.9% pure, supplied as the decahydrate form, the most widely used grade for workshops, studios, restoration and laboratory work.
Borax Powder Specification
| Chemical name | Sodium tetraborate decahydrate (disodium tetraborate) |
| Formula | Na2B4O7·10H2O |
| CAS number | 1303-96-4 |
| EC number | 215-540-4 |
| Purity | 99.9% (technical grade) |
| Appearance | White, odourless crystalline powder |
| Molar mass | 381.37 g/mol |
| pH (1% solution) | approx. 9.2 |
| Pack sizes | 900g (2 lb) and 3kg (6.6 lb) |
| Classification | Repr. 1B, H360FD. For professional use only. |
What Is Borax Powder Used For?
- Soldering and brazing flux – jewellers and metalworkers use borax to keep gold, silver and copper clean and oxide-free while heating.
- Ceramic glazes and enamels – a classic flux that lowers melting points and improves the finish of glazes and glass.
- Timber treatment and restoration – used by restoration professionals to protect timber against fungal decay and wood-boring insects.
- Laboratory buffer – a standard reagent for preparing borate buffer solutions and pH reference work.
- Taxidermy and botanical preservation – helps dry and stabilise specimens.
- Industrial cleaning and water conditioning – an alkaline cleaning agent for workshops, and a water softener in closed technical systems.
Read our full guide to borax uses.
Can You Buy Borax in the UK?
Yes, but with conditions. In Great Britain borax is classified as toxic for reproduction (Repr. 1B), so it can no longer be sold to the general public as a household cleaning product or for children’s slime. It remains legal to supply borax for professional, industrial and laboratory use, which is exactly how we sell it: as a technical raw material with full safety documentation.
If you are buying for laundry or general cleaning at home, choose our borax substitute, a sodium carbonate and bicarbonate blend that is legal for household use. More detail in Is borax banned in the UK?
Borax vs Borax Substitute
| Borax powder | Borax substitute | |
|---|---|---|
| Chemistry | Sodium tetraborate | Sodium carbonate + sodium bicarbonate |
| Who can buy | Trade, industry, labs | Anyone |
| Best for | Flux, glazes, timber, buffers | Laundry, stains, home cleaning |
| Hazard class | Repr. 1B | Not classified as a reproductive toxin |
Full comparison: borax vs borax substitute.
Why Buy Borax from Borax Powder UK
- 99.9% pure sodium tetraborate decahydrate, consistent batch to batch
- Free delivery to the UK in 3–7 working days
- Safety Data Sheet with every order; CoA and Declaration of Conformity on request
- Save 15% when you buy 2 or more packs, with bulk pricing for trade accounts
- Secure card checkout via Stripe
Borax FAQs
What is borax powder used for?
Borax powder is used as a flux for soldering and brazing, an ingredient in ceramic glazes, a timber preservative, a laboratory buffer and an alkaline cleaning agent in professional settings.
Can I buy borax in the UK?
Yes, for professional, industrial and laboratory use. Because borax is classified Repr. 1B, it is not sold to the general public as a household product. For home laundry and cleaning, use a borax substitute.
Is borax the same as borax substitute?
No. Borax is sodium tetraborate. Borax substitute is a blend of sodium carbonate and sodium bicarbonate that performs similarly for laundry and cleaning but is not a boron compound.
What sizes of borax powder do you sell?
We sell 99.9% pure borax powder in 900g (2 lb) and 3kg (6.6 lb) packs. Larger trade quantities are available on request.
Is borax safe?
Borax can be handled safely in professional settings with gloves, eye protection and good ventilation. It is classified H360FD (may damage fertility or the unborn child), so it must be kept away from children and must not be swallowed or used on skin.
How fast is delivery?
Delivery to the UK is free and takes 3–7 working days from dispatch. Unopened products can be returned within 14 days.
Order Pure Borax Powder Today
900g and 3kg packs in stock, with free delivery to the UK.