Sodium gluconate is the sodium salt of gluconic acid — a white, water-soluble crystalline powder used mainly as a chelating agent. In simple terms, it grabs stray metal ions in a formula, which keeps cosmetics, cleaners and industrial mixes more stable and better performing. Azlok stocks it as a fine powder (CAS 527-07-1, formula C6H11NaO7) in packs from 100 g up to 20 kg.
What sodium gluconate actually does
Its usefulness comes down to two properties. First, it dissolves readily in water. Second, it binds metal ions such as calcium, iron and copper. Those trace metals are often the hidden culprits behind cloudy solutions, discolouration, unwanted reactions and reduced shelf life. By locking them up, sodium gluconate helps a product stay clear, consistent and effective for longer.
Common uses
- Cosmetics and skincare: as a chelating agent it supports formula stability and can help preservatives and surfactants work more reliably. You will see it in creams, lotions, cleansers and hair-care products at low percentages.
- Cleaning products: it softens hard water and prevents mineral scaling, which is why it turns up in bottle-wash and industrial cleaners, especially those used in alkaline conditions.
- Construction: it is a well-known concrete admixture that improves workability and delays the setting time, giving crews more time to place and finish concrete.
- Water treatment and metal finishing: its sequestering ability makes it handy wherever unwanted metal ions cause trouble.
How to use it in a formulation
Because it is a functional additive rather than an active, small amounts do the job. In cosmetic and cleaning formulas, chelating agents are typically used at fractions of a percent up to a couple of percent, depending on the recipe and your water quality. A practical approach:
- Dissolve the powder fully in the water phase of your formula before combining with other ingredients.
- Start at the low end suggested by your recipe or supplier documentation, then adjust after testing.
- Check pH and clarity in your finished batch, since chelators can influence how other ingredients behave.
- For concrete, follow the dosage guidance for your mix design — overdosing can excessively retard setting.
Safety and handling
Sodium gluconate is considered low-hazard compared with strong acids and alkalis, but it is still an industrial raw material and should be handled sensibly.
- Avoid breathing in the fine powder; work in a ventilated space and consider a dust mask when weighing large quantities.
- Wear gloves and eye protection, and rinse off any splashes.
- Keep it away from children and pets, and store separately from food.
- This is a raw material for manufacturing and industrial use — it is not a food or medicine, so do not ingest it or use it undiluted on skin.
- Always request and read the MSDS/COA for your batch and patch-test any new cosmetic formula before wider use.
Buying and storage tips
Look for a clean white powder with clear documentation. Azlok supplies sodium gluconate with a stated 24-month shelf life and offers pack sizes from 100 g for hobbyists and small-batch makers up to 20 kg for production runs, so you can match the quantity to how quickly you will use it.
- Store in a cool, dry place in a tightly sealed container — the powder is hygroscopic and can clump if it draws moisture.
- Keep it away from direct sunlight and strong odours.
- Use a clean, dry scoop each time to avoid contaminating the batch.
- Label your container with the name, batch and opening date so you can track shelf life.
FAQ
Is sodium gluconate safe for skin?
When used correctly at low percentages in a properly formulated product, it is a widely accepted cosmetic ingredient. On its own it is a raw material, so it should be diluted into a formula and patch-tested, not applied neat.
What is sodium gluconate used for?
Mainly as a chelating and sequestering agent in cosmetics, skincare and cleaning products, and as a concrete admixture that improves workability and delays setting. It is also used in water treatment and metal finishing.
How much should I add to a cosmetic formula?
Chelating agents are usually used at low levels, often well under one percent. Start with the amount in your recipe or supplier guidance, dissolve it in the water phase, and adjust after testing your batch.
How should I store it?
Keep it in a sealed container in a cool, dry spot away from sunlight and moisture. Stored well, it holds up for around 24 months.
Can I use it in food?
The material sold here is intended for cosmetic and industrial use. Do not treat it as a food ingredient unless you have food-grade product with the appropriate documentation for that purpose.