Acids & Salts Available — Bulk Only

Aluminum Sulfate (Alum)

CAS 10043-01-3 · Formula Al2(SO4)3

Aluminum sulfate (alum, CAS 10043-01-3, Al2(SO4)3) is the most widely used primary coagulant in municipal drinking-water and wastewater treatment. It neutralizes the charge on suspended solids so they flocculate and settle, and it is also used for phosphorus removal, paper sizing, and pH control. Aluminum Sulfate: Applications & Grades In water treatment, alum is dosed […]

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HS Code
2833.22
At a Glance
Material Family
Acids & Salts
Record Type
Pure compound
Primary Role
Coagulation / Flocculation · pH Adjustment
Functional Roles
Coagulation / Flocculation pH Adjustment
Industries Served
Water Treatment Industrial Manufacturing
Safety & Handling
Full SDS available on request

A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.

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HS / Tariff Classification
Harmonized System (HS) Code — 6-digit international heading
2833 . 22
Chapter 28
Inorganic chemicals; compounds of precious metals and rare-earth metals
Heading 28.33
Internationally harmonized (WCO HS)
Subheading 2833.22
6-digit international code — national tariff line adds further digits
Chemical Identity
CAS Number
10043-01-3
Molecular Formula
Al2(SO4)3
Synonyms & Trade Names
Alum Aluminium sulfate Filter alum Papermaker's alum Cake alum Sulfuric acid aluminum salt
Full Description

Aluminum sulfate (alum, CAS 10043-01-3, Al2(SO4)3) is the most widely used primary coagulant in municipal drinking-water and wastewater treatment. It neutralizes the charge on suspended solids so they flocculate and settle, and it is also used for phosphorus removal, paper sizing, and pH control.

Aluminum Sulfate: Applications & Grades

In water treatment, alum is dosed ahead of clarification to coagulate turbidity, color, and organics; it also precipitates phosphate in wastewater and conditions sludge. Industrially it serves as papermaker's alum (rosin sizing), a mordant in textiles, and a pH/astringent agent. Drinking-water grades are certified to NSF/ANSI/CAN 60 and meet AWWA B403.

Grades Compared

Liquid alum dominates municipal use; dry grades suit smaller or remote feed systems and freight-sensitive shipments:

Grade Form Strength Typical use
Liquid alum ~48.5% solution ~8.3% Al2O3 Municipal water/wastewater coagulation, P removal
Dry alum (ground/granular) Solid ~17% Al2O3 Dry-feed plants, freight-sensitive sites
Iron-free (low-iron) Liquid or dry ~17% Al2O3 Paper, potable polishing, low-metals specs

Need a specific strength or an NSF-60 certificate on file? Send your dose point, water chemistry, and volume on an RFQ and we'll quote the right grade.

Frequently Asked Questions

What is aluminum sulfate (alum) used for?

Alum is the primary coagulant in municipal drinking-water and wastewater plants, where it charge-neutralizes suspended solids so they flocculate and settle. It also removes phosphorus, conditions sludge, sizes paper, and acts as a mordant and pH/astringent agent. RawSource supplies NSF/ANSI 60 drinking-water grades to spec.

What is the difference between liquid and dry alum?

Liquid alum (~48.5%, ~8.3% Al2O3) ships ready to feed and is standard at municipal plants; dry alum (~17% Al2O3) suits dry-feed systems, smaller plants, and freight-sensitive shipping. The coagulation chemistry is identical — the choice is handling, storage, and logistics. RawSource quotes either.

Is your aluminum sulfate NSF certified for drinking water?

Drinking-water-grade aluminum sulfate is certified to NSF/ANSI/CAN 60 and meets AWWA B403; reference your spec on the RFQ and we confirm certification and provide the CoA at quotation.

How is aluminum sulfate supplied in bulk?

RawSource supplies alum as ~48.5% liquid in bulk tankers and totes, or dry in bags and supersacks, under CAS 10043-01-3 / HS 2833.22. Grade, strength, packaging, and MOQ are confirmed at quotation against the CoA. Submit a bulk RFQ with your dose and volume.

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Disclaimer. Information on this page — including properties, identifiers, hazard, transport (DOT/UN) and tariff (HS) classifications, and applications — is provided for general reference and is compiled from authoritative public sources (e.g. PubChem/ECHA, 49 CFR 172.101, the Harmonized Tariff Schedule). Values are typical and are not a guaranteed specification; the Certificate of Analysis (CoA) for the lot purchased governs. Products are sold for industrial and professional use only. Nothing here is a medical, health, or efficacy claim or advice. Always consult the current Safety Data Sheet (SDS) before handling, storage, transport or disposal, and confirm regulatory status, classification and suitability for your application and jurisdiction. Hazard, transport and tariff classifications must be verified for your specific shipment. RawSource makes no warranty, express or implied, and assumes no liability for use of this information. Trademarks. Third-party trademarks and brand names are the property of their respective owners; any reference is nominative — used only to identify a comparable product — and does not imply affiliation with, sponsorship by, or endorsement by the trademark owner.

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