CAS 7783-40-6 refers to ferric sulfate hydrate, an inorganic iron(III) sulfate material supplied with water of crystallization. I work with this product at Azeal Materials as a chemical supplier serving industrial buyers, water-treatment companies, formulators, and international distributors. Its principal commercial use is as an iron-based coagulant for removing suspended solids, colloids, natural organic matter, phosphorus, and selected dissolved contaminants from water.
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Because the CAS number identifies a hydrated material rather than one universally fixed hydration state, buyers should confirm the supplier’s formula description, iron content, sulfate content, moisture range, physical form, and intended application before ordering. Ferric sulfate hydrate is commonly delivered as a solid powder, granular material, or solution prepared to meet a specific process requirement. Product selection should therefore be based on both chemical identity and application performance.
Ferric sulfate hydrate contains ferric iron, written as Fe3+, combined with sulfate ions and water of crystallization. The anhydrous ferric sulfate unit is commonly represented as Fe2(SO4)3, while the hydrate may be represented as Fe2(SO4)3·xH2O because the value of x can vary with manufacturing and storage conditions. This variable hydration is one reason why the stated molecular weight may differ between product grades.
When dissolved in water, ferric sulfate undergoes hydrolysis and forms ferric hydroxide species under suitable pH conditions. These hydrolysis products can neutralize particle charges and create precipitates that capture suspended material. The practical result is improved separation during coagulation, flocculation, sedimentation, flotation, or filtration.
The primary function of CAS 7783-40-6 in water treatment is coagulation. Ferric ions help destabilize negatively charged particles that would otherwise remain dispersed in water. As the treatment reaction proceeds, iron-based hydroxide precipitates can form larger flocs that are easier to settle or filter.
Ferric sulfate hydrate can be considered where a treatment plant needs an iron-based alternative to aluminum coagulants. The actual result depends on raw-water chemistry, pH, alkalinity, temperature, mixing conditions, and dose. A jar test or controlled process trial remains the most reliable way to establish the working dosage.
Ferric salts can react with phosphate to form sparingly soluble iron-phosphate compounds or incorporate phosphate into the developing floc. This makes ferric sulfate hydrate relevant to municipal wastewater, industrial effluent, and nutrient-control applications. It may also support the removal of some natural organic matter and color, although performance varies substantially with the source water.
For example, a treatment team may compare ferric sulfate hydrate with an aluminum salt when phosphorus limits are strict or when the plant already has experience managing iron-containing sludge. The decision should include residual iron, sludge volume, pH adjustment, and downstream filtration requirements rather than relying on product price alone.
Ferric sulfate hydrate is not a universal treatment chemical. Highly alkaline or highly acidic waters, high-complexity industrial effluents, and streams containing strong chelating agents may require different chemistry or additional treatment stages. I recommend evaluating the complete water matrix before selecting a commercial grade.
Commercial supply may differ in physical form, hydration level, iron concentration, acidity, particle size, and packaging. Solid grades are useful when customers have controlled storage and onsite dissolving equipment, while liquid grades can reduce preparation work but may increase transport weight and handling requirements. The appropriate format depends on dosing equipment, storage capacity, local transport conditions, and consumption rate.
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| Material consideration | Why it matters | Buyer question |
|---|---|---|
| Physical form | Affects dissolution, feeding, storage, and dust control | Is powder, granule, or solution best for the dosing system? |
| Iron assay | Influences active dosage calculations | Is the result reported as total iron, Fe3+, or ferric sulfate? |
| Moisture or hydration | Changes effective concentration and mass balance | What range is controlled and reported on the specification sheet? |
| Insoluble matter | Can affect pumps, strainers, and final water clarity | What insoluble-residue limit applies to the selected grade? |
A serious purchase specification should include the CAS number, product name, appearance, assay basis, iron content, sulfate content where relevant, moisture or hydration range, insoluble matter, pH of a defined solution, and packaging details. Buyers should also request a current certificate of analysis for the production lot rather than depending only on a general brochure. If the material will contact drinking water, the buyer must independently confirm the regulatory requirements applicable in the destination market.
Useful quantitative checks include the intended solution concentration, the dosing range established by testing, and the storage temperature range defined by the supplier. For instance, a technical team may prepare a 10% w/w laboratory solution for screening, evaluate performance over a dose range expressed in mg/L, and monitor mixing or settling over 30 minutes. These are examples of test parameters, not universal product specifications; actual values should be selected for the water and equipment involved.
First, identify whether the priority is turbidity removal, phosphorus reduction, color control, clarification, or a combination of objectives. Measure important raw-water characteristics, including pH, alkalinity, turbidity, temperature, phosphate, organic load, and competing ions where applicable. This information gives the supplier and treatment engineer a practical basis for recommending a grade and test plan.
A lower price per metric ton does not necessarily mean a lower treatment cost. Hydration, moisture, iron assay, packaging, freight, dissolution efficiency, and required dosage all affect the delivered cost per unit of active iron or treated water. I help buyers compare quotations on an equivalent basis so that different grades are not evaluated only by nominal weight.
Ferric sulfate hydrate should be handled according to the supplier’s safety documentation, with suitable protection against dust, contact, and accidental release. Storage design should account for moisture sensitivity, corrosion potential, ventilation, and segregation from incompatible materials. Dosing pumps, tanks, pipelines, and seals should be checked for compatibility with the prepared solution and process conditions.
At Azeal Materials, I support B2B buyers by clarifying the product identity, specification basis, physical form, packaging, and export documentation before shipment. We can discuss whether a solid ferric sulfate hydrate grade or another delivery format is more suitable for your dosing system and operating model. Where buyers provide water-quality information, we can help organize the technical questions needed for supplier review and application testing.
For repeat procurement, I also recommend agreeing on a written specification, acceptable lot variation, packaging format, labeling requirements, and inspection documents. Buyers should confirm MOQ, production schedule, port or delivery terms, and sample availability at the quotation stage. These details reduce the risk of receiving a chemically similar product that does not match the intended process or local compliance expectations.
CAS 7783-40-6 can be a suitable ferric-based coagulant for water and wastewater treatment when the product grade matches the process requirements. It is especially relevant for clarification, suspended-solids removal, and phosphorus-control programs, but its performance cannot be guaranteed from the CAS number alone. The correct decision requires confirmation of the material specification, raw-water conditions, treatment objective, and handling system.
As a next step, prepare your target application, expected monthly quantity, preferred physical form, destination country, and available water-quality data. Contact Azeal Materials for a product specification review, commercial quotation, packaging discussion, and documentation checklist for ferric sulfate hydrate. With these details, I can help you evaluate CAS 7783-40-6 on active content, technical suitability, supply reliability, and total procurement value.
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