Borax Powder: What It Actually Does, From Slime to Cleaning (and the Safety Truth)
Borax — sodium borate (Na₂B₄O₇·10H₂O) — is one of those old-fashioned powders that quietly does a dozen jobs. It's a naturally occurring mineral salt, mildly alkaline, and it's been a laundry and cleaning staple for generations.
It's also widely misunderstood, so let's be precise about what it does and how to use it responsibly.
Why borax cleans
In water, borax is mildly alkaline (around pH 9), which helps it cut grease and lift stains, and it acts as a water softener — it ties up the calcium and magnesium that make water 'hard', so detergents work better. It also has mild fungistatic properties, which is why it turns up in mould and mildew remedies.
Common uses
- Laundry booster: a spoonful with your detergent softens water and brightens wash.
- General cleaning: dissolved in warm water for sinks, tiles and surfaces.
- Slime making: borax solution cross-links PVA glue into the classic stretchy slime (a school-science favourite).
- Craft and industrial uses: a flux in some metalwork and a component in various formulations.
Safety — the honest version
- Borax is for household, cleaning and craft use — not for eating. Don't ingest it.
- Keep it well away from children and pets, and label it clearly.
- Wear gloves for prolonged contact; rinse skin if irritated, and avoid breathing the dust.
- For slime and crafts with kids, an adult should handle the borax and the solution should be weak — children shouldn't eat or mouth slime.
- Don't use it on food or as a food preservative.
Frequently Asked Questions
What is borax powder used for?
Mainly cleaning and laundry (it softens water and cuts grease), making slime (it cross-links PVA glue), and various craft/industrial uses like metalwork flux. It is not a food product.
How does borax make slime?
A weak borax-in-water solution cross-links the long polymer chains in PVA glue, turning runny glue into a stretchy, rubbery slime. An adult should handle the borax.
Is borax safe to use at home?
Used as a cleaning/craft product with basic precautions — gloves for long contact, no ingestion, kept away from children and food — it's a long-standing household staple. It must not be eaten.
Can borax be used as a food preservative?
No. Despite old practices, it should not be used on or in food. Keep it strictly for cleaning, laundry and craft uses.
Azlok (Dr Tomar) Borax Powder is a versatile household powder for laundry, cleaning and slime/craft projects. Use it with gloves, keep it away from food and children, and never ingest it.