What Is CAS 7783-40-6? Ferric Sulfate Hydrate Uses, Specifications, and Water-Treatment Applications

CAS 7783-40-6 is ferric sulfate hydrate, an inorganic iron(III) sulfate material containing ferric ions, sulfate ions, and water of crystallization. Its general composition is represented as Fe₂(SO₄)₃·xH₂O, where the value of x can vary according to the product’s hydration state and manufacturing process. I recommend treating the CAS number as an identity reference, not as a complete product specification, because commercial grades can differ in iron assay, moisture, insoluble matter, particle form, and intended application.

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In water treatment, ferric sulfate hydrate is primarily used as a coagulant. It helps destabilize suspended particles and can support the removal of turbidity, color, phosphate, and selected metal-containing contaminants when the chemistry and dosage are properly controlled. At Azeal Materials, we support B2B buyers by clarifying the required grade, test parameters, packaging, documentation, and delivery conditions before quotation.

What Is Ferric Sulfate Hydrate?

Ferric sulfate hydrate is a hydrated salt of sulfuric acid and ferric iron. In water, it provides Fe³⁺ ions that undergo hydrolysis and form iron-containing hydroxide species, especially when the pH is adjusted into a suitable treatment range. These species can adsorb or enmesh fine particles, allowing them to combine into larger flocs that are easier to separate by sedimentation, flotation, or filtration.

The term “hydrate” is important for purchasing and formulation work. Unlike an anhydrous material with a fixed composition, a hydrate may contain a variable quantity of crystal water, so the molecular weight and active-component calculation depend on the stated form. For this reason, I advise buyers to request the supplier’s declared formula, appearance, assay basis, moisture value, and certificate of analysis rather than relying on the CAS number alone.

Core Functions and Chemical Role

Coagulation and floc formation

The principal function of ferric sulfate hydrate in water treatment is coagulation. Ferric ions reduce the stability of negatively charged colloids and contribute to the formation of insoluble or poorly soluble iron hydroxide species. These materials can capture suspended solids and organic matter, producing flocs that downstream equipment can remove.

Phosphate and contaminant reduction

Ferric-based coagulants are also used where phosphate reduction is required, because iron can react with phosphate and support its incorporation into settleable solids. Performance depends on phosphate concentration, alkalinity, temperature, competing ions, mixing conditions, and the selected dosage. I therefore recommend jar testing or a comparable process evaluation before full-scale purchasing decisions.

Process support beyond basic clarification

Depending on the treatment system, ferric sulfate hydrate may support color reduction, suspended-solids removal, and certain industrial wastewater applications. It should not be assumed to remove every dissolved contaminant or to replace filtration, biological treatment, oxidation, or disinfection. The correct role must be defined from the actual water analysis and the treatment objective.

Common Water-Treatment Applications

• Municipal drinking-water pretreatment: It may be considered for coagulation and clarification where iron-based treatment is compatible with the plant process and regulatory requirements.
• Municipal wastewater: It can support suspended-solids and phosphate control before clarification, filtration, or discharge.
• Industrial wastewater: It may be evaluated for wastewater streams from chemical processing, manufacturing, mining-related operations, and other industries that require solids or phosphate reduction.
• Sludge conditioning: In some systems, ferric salts are used to improve solids separation or support dewatering, although the result depends strongly on sludge composition and equipment.
• Process-water clarification: It can be screened as a coagulant where fine particles or color interfere with reuse or subsequent process steps.

Application performance should be confirmed through controlled testing rather than inferred from product identity alone. A practical evaluation may compare several dosages, mixing times, settling periods, and pH conditions. For example, a laboratory program may screen doses from 10 mg/L to 1,000 mg/L as product or active component, but the correct range must be established from the water matrix and the supplier’s dosing basis.

Types and Material Options

Ferric sulfate hydrate may be supplied in different physical forms, including powder, granules, or other customer-specified forms. The choice depends on the dosing system, storage environment, dissolution requirements, dust control needs, and transport conditions. A powder may dissolve readily but require stronger dust-management measures, while a granular form may be easier to handle in some installations.

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Product descriptions can also differ by assay basis. One supplier may report total iron, another may report ferric sulfate content, and a third may describe a calculated active-component percentage. These values are not automatically interchangeable, so buyers should ask whether results are reported on an as-is basis, dry basis, or another defined basis.

Key Specifications Buyers Should Review

As examples of measurable specification formats, a buyer may request iron content in wt%, insoluble matter below a defined wt% limit, or pH measured at a stated concentration such as 10% w/w. These are specification formats rather than universal values for every CAS 7783-40-6 product. I recommend setting the actual limits according to the application, local requirements, equipment constraints, and validated treatment results.

How to Select the Right Grade

Start with the treatment objective

First, define whether the priority is turbidity reduction, phosphate control, color removal, sludge conditioning, or a combination of objectives. Then collect the relevant water data, including pH, alkalinity, suspended solids, phosphate, conductivity, temperature, and any regulated impurities. This information allows the supplier to discuss a technically relevant grade instead of offering a generic material.

Compare products on an equivalent basis

Do not compare quotations only by price per kilogram. Convert the price to a consistent basis, such as cost per kilogram of iron or cost per treated cubic meter, after accounting for assay, moisture, packaging, transport, and actual dosage. A lower unit price may not represent lower treatment cost if the product contains less active material or creates handling difficulties.

Check storage and dosing compatibility

Ferric sulfate hydrate should be stored in a dry, protected area using packaging and equipment compatible with the material. Buyers should confirm shelf-life guidance, recommended storage temperature, moisture protection, batch traceability, and whether the product tends to cake under their warehouse conditions. The dosing system should also be reviewed for corrosion resistance and safe preparation procedures.

How Azeal Materials Supports B2B Buyers

At Azeal Materials, we approach CAS 7783-40-6 as a technical sourcing requirement rather than a simple catalog transaction. We can discuss the intended application, required composition, physical form, packaging preference, destination, and documentation before preparing a supply proposal. Where the specification is not yet fixed, we help organize the key questions needed for supplier and laboratory evaluation.

For an inquiry, I recommend sending the target application, estimated annual or trial quantity, required iron or active-content basis, preferred packaging, destination port, and any quality or regulatory requirements. If you have a current certificate of analysis or competing specification, sharing it can make the comparison more accurate. Depending on the project, we can discuss sample evaluation, trial quantities, regular bulk supply, export documentation, and delivery planning without making unsupported claims about performance.

Key Takeaways

• CAS 7783-40-6 refers to ferric sulfate hydrate, generally represented as Fe₂(SO₄)₃·xH₂O.
• Its main water-treatment role is iron-based coagulation, with potential value in turbidity, suspended-solids, color, and phosphate control.
• The CAS number does not establish a complete commercial specification or a guaranteed hydration state.
• Buyers should compare assay basis, moisture, insolubles, physical form, impurity limits, packaging, and dosing compatibility.
• Jar testing and application-specific analysis are important before selecting a full-scale treatment dosage.

Conclusion: Is CAS 7783-40-6 Suitable for Your Project?

CAS 7783-40-6 can be a suitable ferric-based coagulant for water and wastewater applications when its composition, physical form, impurity profile, and dosing behavior match the process requirements. Its suitability cannot be confirmed from the CAS number alone, because hydration state and commercial specifications may vary. The most reliable next step is to define the treatment target, review the water analysis, compare equivalent assay data, and validate performance through controlled testing.

If you are sourcing ferric sulfate hydrate for municipal, industrial, or process-water use, contact Azeal Materials with your target specification and delivery requirements. I can help you identify the information needed for a qualified quotation and a practical supplier evaluation.

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