Sodium Sulphate Anhydrous
The workhorse filler and process salt behind detergents, kraft paper recovery and glassmaking — a high-volume, low-hazard inorganic salt.
Chelora Chemicals supplies detergent and technical-grade sodium sulphate anhydrous to industrial producers worldwide, with full documentation on every consignment.
Product identity
- CAS Number
- 7757-82-6
- IUPAC name
- Sodium sulfate
- Molecular formula
- Na₂SO₄
- Molecular weight
- 142.04 g/mol
- Melting point
- 884 °C
- Density
- 2.68 g/cm³
- Transport status
- Not classified as DG
- HS Code
- 2833.11
Note: Anhydrous sodium sulphate readily absorbs moisture to form the decahydrate (Glauber's salt); confirm storage requirements with your regulatory affairs team.
What Sodium Sulphate Anhydrous is used for
Sodium Sulphate Anhydrous is a white, odourless, crystalline solid, supplied either as a by-product of chemical manufacturing (historically earning the trade name "salt cake") or recovered and refined from natural mineral deposits such as mirabilite and thenardite.
Its largest use is as a filler and processing aid in powder laundry detergents, where it improves flow properties and bulk density. It is equally important in kraft paper pulping, where it is added to the recovery furnace to replenish process chemicals, in glass manufacture as a fining agent that removes bubbles from molten glass, and in textile dyeing, where it promotes even dye uptake (levelling) and helps exhaust dye from the dyebath onto the fibre.
Where it sits in the value chain
- Mineral brine / chemical by-product the natural or process-derived source of sodium sulphate.
- Sodium Sulphate Anhydrous (this product) refined and dehydrated to the purity your process requires.
- Detergent powder / kraft pulp / glass / dyed textile the downstream products built using this salt.
Handling character
Sodium Sulphate Anhydrous is generally regarded as non-hazardous under normal industrial handling, though as a fine powder it can cause mild, transient eye and respiratory irritation. Full hazard detail is in the Safety section below.
| Parameter | Typical value |
|---|---|
| Appearance | White crystalline powder or granules |
| Na₂SO₄ assay | 99.0% min (detergent grade) |
| Moisture | < 0.5% (typical) |
| Iron (Fe) | < 10 ppm (typical) |
Important: the figures above are indicative of commercial material and are offered for planning only. The batch certificate of analysis is the governing document.
| Property | Value |
|---|---|
| Physical state | White, odourless crystalline solid |
| Melting point | 884 °C |
| Density | 2.68 g/cm³ |
| Water solubility | High, temperature-dependent (peaks near 32 °C) |
| Hygroscopicity | Absorbs moisture, forms decahydrate |
| pH (aqueous solution) | Neutral (~7) |
Physical constants compiled from public reference data for CAS 7757-82-6 and rounded for readability. Treat them as orientation, not as a specification.
Where our customers put Sodium Sulphate to work
From detergent powders to kraft paper mills, glass furnaces and dye houses.
Powder detergent filler
Used as a bulking filler and free-flow aid in powder laundry detergent formulations.
- Detergent-grade specification
- Documented batch traceability
Kraft paper chemical recovery
Added to the recovery furnace in kraft pulping to replenish sodium and sulphur process chemicals.
- Technical-grade material
- Bulk supply available
Glass manufacture
Used as a fining and melting aid that removes bubbles and improves melt quality in glass production.
- Low-iron grade available
- Full analytical documentation available
Textile dyeing
Used as a levelling and exhausting agent that promotes even, efficient dye uptake onto fibres.
- Low-heavy-metal grades available
- Technical desk review on request
Chemical manufacturing
Used as a raw material and processing aid across broader inorganic chemical manufacturing.
- Research & process-scale quantities
- Full documentation supplied
Contract & scheduled supply
Detergent and paper plants running continuous consumption are supported with scheduled bulk delivery.
- Annual contracts with scheduled call-off
- Second source held in reserve
How we supply Sodium Sulphate Anhydrous
Chelora Chemicals is a supplier and sourcing partner, not a manufacturer. Moisture control and particle sizing vary meaningfully between producers — that shapes how we manage this line.
We place your order with whichever qualified producer best matches your required grade, your price point and your delivery window, and confirm your jurisdiction's import requirements before booking.
We keep a second qualified source on this line, so a single-plant disruption never becomes your production problem.
- Assay, moisture and iron content confirmed before we quote. Consistency matters to detergent, glass and textile processes.
- Export documentation managed end to end. Classification, labelling and carrier compliance confirmed before booking.
- Moisture-protected packaging as standard. Guards against the material's tendency to absorb moisture and cake.
- Batch traceability to the producing plant. Full chain of custody documentation on request.
- Export machinery handled in-house. Classification, approved packing, labelling, freight booking and customs paperwork are ours to manage.
- Detergent or technical-grade material sourced to your process. Matched precisely to your formulation or process specification.
Packed the way your plant receives it
Bag, jumbo bag or bulk container — tell us your preferred format and we will quote and classify to it.
25-50 kg moisture-sealed bags
Multi-wall bags with poly liner, protecting against moisture absorption.
1,000-1,500 kg bulk bags
Sealed jumbo bags for bulk-volume detergent and glass industry orders.
Bulk-volume shipments
Container bulk or vessel shipment for continuous-consumption paper mills and detergent plants.
Incoterms to suit you
Quoted on the Incoterm your purchasing team works to, with documentation filed before booking.
Trial / sample quantities
Small packs dispatched for process trials before a commercial order is placed.
Contracted call-off supply
We hold contracted tonnage and release it against your consumption calendar.
Non-hazardous salt — standard powder handling applies
Sodium Sulphate Anhydrous is not classified as hazardous under normal use. The summary below is orientation only — the safety data sheet supplied with your specific batch is the authoritative document.
Handling notes
NoteMay cause mild, transient mechanical irritation to eyes and respiratory tract as a fine powder.
Minimise dust generation during bagging and transfer. Always read the SDS issued with your specific batch for full handling guidance.
Storage
Store in tightly closed containers in a cool, dry place away from moisture, as the anhydrous form absorbs water readily and converts to the decahydrate.
Handling
Use standard dust-control measures (local exhaust or dust masks) during bagging, weighing and transfer; no special protective equipment is required beyond good powder-handling practice.
Transport
Sodium Sulphate Anhydrous is not classified as a dangerous good for transport; standard commercial shipping documentation applies.
Every batch, documented
We verify documentation before dispatch so there are no surprises at your incoming-goods bench.
Specification agreed
Assay, moisture and iron content confirmed against your process requirement before order placement.
Producer batch testing
The producing plant tests each batch against the agreed specification before release.
Documentation review
COA, SDS and transport paperwork checked by our desk before the shipment is booked.
Traceable dispatch
Each shipment is traceable to its producing batch, with full chain-of-custody records on request.
How Sodium Sulphate is made
Sodium Sulphate reaches the market through two main routes: as a by-product of chemical manufacturing — notably the Mannheim process, which reacts sodium chloride with sulphuric acid to produce hydrochloric acid and sodium sulphate ("salt cake") as a co-product — and from natural mineral deposits (mirabilite, Na₂SO₄·10H₂O, and thenardite, Na₂SO₄), which are mined, purified and dehydrated to the anhydrous form.
We do not publish operating process parameters here; this is background only. Full technical documentation accompanies every shipment, and any process-specific detail you need is best confirmed directly with our technical desk.
| Chemical family | Inorganic sulphate salt |
|---|---|
| Hydrate forms | Anhydrous (this product), decahydrate (Glauber's salt) |
| Reactivity | Chemically stable; hygroscopic, converts to decahydrate with moisture |
| Related materials | Soda Ash, Sodium Sulphite, Sodium Bisulphate |
Explore the wider inorganic salts range
Sodium Sulphate Anhydrous, answered
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Is Sodium Sulphate Anhydrous hazardous?
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