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Polyferric Sulfate (PFS)

CAS 35139-28-7 · Formula [Fe2(OH)n(SO4)3-n/2]m (polymeric) · MW 399.9 g/mol

An iron-based coagulant that forms dense, fast-settling flocs across a broad pH range. It is used as a primary coagulant for solids and color removal in drinking-water and wastewater treatment.

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UN Number
UN 3264
Hazard Class
Class 8
HS Code
2833.29
At a Glance
Material Family
Acids & Salts
Record Type
Pure compound
Primary Role
Moisture Control
Solubility
Soluble at room temperature
Functional Roles
FERRIC SULFATE
HUMECTANT
Applications & Use Cases
  • Drinking-water treatment: Primary coagulant for potable-water clarification.
  • Wastewater treatment: Coagulant for municipal and industrial effluent.
  • Solids removal: Destabilizes colloids and suspended solids.
  • Color removal: Reduces color in treatment streams.
Physical Properties
Melting Point
The Anhydrous form decomposes (480°C)
Boiling Point
The Anhydrous form decomposes (480°C)
Density
3.1 at 20 °C
Solubility
Soluble at room temperature
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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DOT / UN Transport Classification
DOT hazard class 8 placard
UN / DOT NumberUN 3264
Hazard Class / DivisionClass 8
Proper Shipping NameCorrosive liquid, acidic, inorganic, n.o.s

Transport classification per the UN Model Regulations / 49 CFR 172.101 Hazardous Materials Table. Confirm against the grade-specific SDS (Section 14) before shipping.

HS / Tariff Classification
Harmonized System (HS) Code — 6-digit international heading
2833 . 29
Chapter 28
Inorganic chemicals; compounds of precious metals and rare-earth metals
Heading 28.33
Internationally harmonized (WCO HS)
Subheading 2833.29
6-digit international code — national tariff line adds further digits
Chemical Identity
CAS Number
35139-28-7
Molecular Formula
[Fe2(OH)n(SO4)3-n/2]m (polymeric)
Molecular Weight
399.9 g/mol
INCI Name
FERRIC SULFATE
PubChem CID
Synonyms & Trade Names
FERRIC SULFATE Iron(III) sulfate Iron persulfate Iron(3+) sulfate Ferric persulfate Iron sesquisulfate Iron tersulfate Sulfuric acid, iron(3+) salt (3:2) Diiron trisulfate Ferric tersulfate Ferric sesquisulfate Coquimbite mineral Iron sulfate (2:3) Iron sulfate (Fe2(SO4)3) Iron(3+) sulfate, (2:3) Polyferric sulfate Polymeric ferric sulfate PFS
Full Description

Polyferric sulfate (PFS) is a pre-hydrolyzed basic iron(III) sulfate coagulant; it carries its own polymeric CAS number, 35139-28-7, distinct from conventional ferric sulfate (CAS 10028-22-5). It is used as a primary coagulant for solids and color removal in drinking-water and wastewater treatment.

Frequently Asked Questions

What is polyferric sulphate used for?

Polyferric sulfate (PFS) is a pre-hydrolyzed basic iron(III) sulfate used as a primary coagulant in drinking-water and wastewater treatment. It destabilizes colloids and suspended solids for solids and color removal in municipal and industrial streams.

What is the difference between polyferric sulfate and ferric sulfate?

Polyferric sulfate is a pre-hydrolyzed, polymerized basic iron(III) sulfate, which can give faster floc formation across a wider pH range than conventional ferric sulfate. PFS carries its own polymeric CAS number, 35139-28-7, distinct from conventional ferric sulfate (CAS 10028-22-5); confirm the exact basicity and Fe content on the CoA.

What is another name for ferric sulfate?

Ferric sulfate is also called iron(III) sulfate, CAS 10028-22-5, formula Fe2(SO4)3. Polyferric sulfate (PFS) is the pre-hydrolyzed polymeric coagulant derived from this chemistry.

What is the HS code for polyferric sulphate?

It classifies under HS 2833.29 (sulfates; other). Confirm the final classification with your customs broker for the specific product form and concentration.

What is the cost of bulk polyferric sulphate?

Pricing depends on Fe concentration, form (liquid or solid), and order volume. Request a current quote from RawSource with your dosing volume and packaging needs; CoA and SDS are provided with each shipment.

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.