Al2(SO4)3
Established coagulant for water clarification, also used in paper sizing and textile processing.
Aluminium sulphate is one of the most established coagulants in water treatment. When added to water it forms aluminium hydroxide flocs that capture suspended particles.
It is used for clarification of drinking water and wastewater, phosphate removal, paper sizing and as a mordant in textile dyeing. Iron content and form vary by grade — please specify your requirement when requesting a quotation.
Typical uses for this chemical. Suitability for a specific process, and grade requirements for food, pharmaceutical or potable-water use, should be confirmed with our team.
| Chemical name | Aluminium sulfate |
|---|---|
| Formula | Al2(SO4)3 |
| CAS number | 10043-01-3 (anhydrous)7784-31-8 (octadecahydrate) |
| Molecular weight | 342.15 (anhydrous); 666.43 (octadecahydrate); approx. 594 (commercial ~14H2O) |
| HS code | 2833.22 |
| Transport classification | Solid: not regulated · Liquid: commonly UN3264, Class 8, PG III |
| Appearance | White to off-white/greyish granules, kibbles, flakes or powder (non-ferric); light tan to brownish (ferric grades); liquid clear to light green/yellow/amber |
| Forms | Powder · Granular · Kibbled / lumps (crushed) · Flakes / slabs · Liquid solution (approx. 8% Al2O3) |
| Grades | Non-ferric / iron-free, drinking-water grade (EN 878 Type 1, AWWA B403, IS 299 Grade 4/5) · Ferric (alumino-ferric) grade, wastewater/industrial (IS 299 Grade 1–3) · Papermaking grade · Food grade (FCC) liquid |
| Packaging | 25 kg and 50 kg PP woven / laminated waterproof bags · 1,000 kg jumbo bags · Bulk · 50 lb paper bags and 2,250 lb super sacks (US) · Liquid: drums (e.g. 605 lb) or bulk |
Identifiers and classifications are standard reference data for the substance. Forms, grades and packaging reflect what is commonly traded internationally; availability for your order is confirmed in the quotation.
Typical values for commonly traded grades of Aluminium Sulphate, based on international standards and published manufacturer data.
| Parameter | Typical value |
|---|---|
| Al2O3 content (water-soluble) | 15.8–17.5% (17% typical) |
| Iron (as Fe) | ≤0.01% (typ. ≤0.005%) |
| Water-insoluble matter | ≤0.2% (typ. ≤0.1%) |
| pH (1% solution) | ≥3.0 |
| Free acid (as H2SO4) | ≤0.5% |
| Arsenic (As) | ≤5 mg/kg |
| Lead (Pb) | ≤20 mg/kg |
| Bulk density | 800–1,100 kg/m³ (depends on particle size) |
| Parameter | Typical value |
|---|---|
| Al2O3 content (water-soluble) | 15–17% |
| Soluble iron | ≤0.7% as Fe (≤0.75% as Fe2O3) |
| Water-insoluble matter | ≤0.5% |
| pH (5% solution) | ≥2.7 |
| Free acid (as H2SO4) | ≤0.5% |
| Parameter | Typical value |
|---|---|
| Al2O3 content (total soluble) | 8.0–8.4% |
| Equivalent dry alum (Al2(SO4)3·14H2O) | approx. 48.5% |
| Free Al2O3 | 0.01–0.20% |
| Iron (as Fe2O3) | ≤0.005% (iron-free) to ≤0.3% (standard) |
| Water-insoluble matter | ≤0.02% (low-iron) to ≤0.5% (standard) |
| Specific gravity | 1.30–1.35 |
| pH (neat) | 1.4–2.6 |
| Freezing point | approx. -16 °C |
Non-ferric grades are used for drinking water and paper; ferric grades suit wastewater treatment. Liquid alum is quoted as % Al2O3.
Typical values are for guidance. The specification for your order depends on grade and origin and is confirmed in the quotation, Technical Data Sheet and Certificate of Analysis.
Packaging commonly used for export shipments of this product. Availability depends on grade and origin and is confirmed per order.
Packaging confirmed per order
Tell us your preferred packaging and handling requirements — we'll confirm available options for your grade, volume and destination.
Request the documents you need to evaluate Aluminium Sulphate. We send documents that match the grade being quoted.
Product specifications and technical information.
Safety and handling documentation where available.
Batch-specific documentation where applicable.
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Share your quantity and destination — our export team will confirm grade, packaging and pricing.
Aluminium Sulphate is commonly traded as Non-ferric / iron-free, drinking-water grade (EN 878 Type 1, AWWA B403, IS 299 Grade 4/5); Ferric (alumino-ferric) grade, wastewater/industrial (IS 299 Grade 1–3); Papermaking grade; Food grade (FCC) liquid. Availability varies by origin and destination market — share the grade, purity or standard you require and we will confirm what can be supplied, with the current specification.
Aluminium Sulphate is usually classified under HS 2833.22. National tariff codes add further digits and can differ by form and country, so confirm the full code with your customs broker before shipment.
Typical transport classification: Solid: not regulated · Liquid: commonly UN3264, Class 8, PG III. Classification can vary with concentration and form, so the Safety Data Sheet for the grade shipped is the reference used when booking freight.
Commonly referenced standards include AWWA B403, EN 878, IS 299, GB/T 31060-2014. Tell us which standard your application or market requires and we will confirm a grade that meets it.
Common export packaging for Aluminium Sulphate includes 25 kg and 50 kg PP woven / laminated waterproof bags; 1,000 kg jumbo bags; Bulk; 50 lb paper bags and 2,250 lb super sacks (US). Tell us your preferred packaging and we will confirm what is available for your grade and volume.
Yes — request them on this page. We send the documents that apply to the specific grade you are evaluating; a Certificate of Analysis is batch-specific and issued where applicable.
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