What Is CAS 7758-94-3? Properties, Forms, and Industrial Uses

CAS 7758-94-3 is commonly identified as ferrous chloride, also called iron(II) chloride or iron dichloride. Its anhydrous chemical formula is FeCl₂, with a relative molecular mass of approximately 126.75 g/mol. In commercial supply, I recommend confirming whether the product is offered as an anhydrous material, a hydrate, or an aqueous solution because the physical form, assay basis, packaging, and handling requirements can differ significantly.

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Ferrous chloride is an inorganic iron salt used mainly in water and wastewater treatment, chemical processing, metal-related applications, and as an intermediate for other iron compounds. At Azeal Materials, I help B2B buyers evaluate the correct form and specification according to their process, rather than selecting only by CAS number.

Key Takeaways

• CAS 7758-94-3 generally refers to ferrous chloride, an iron(II) chloride compound.
• The anhydrous reference formula is FeCl₂, with a molecular mass of about 126.75 g/mol.
• Commercial products may be supplied as solid material or liquid solution, and some products may be hydrates or mixtures with different assay conventions.
• Common industrial uses include wastewater treatment, chemical synthesis, iron-compound production, and selected metallurgical processes.
• Buyers should confirm concentration, iron oxidation state, insoluble matter, packaging, shelf-life expectations, and transport requirements before ordering.

What Is Ferrous Chloride?

Ferrous chloride is the chloride salt of iron in the +2 oxidation state. It is distinct from ferric chloride, in which iron is in the +3 oxidation state; this difference affects reactivity, color, oxidation behavior, and application performance. Ferrous chloride is typically sensitive to oxidation in air, so exposure to oxygen, moisture, and unsuitable storage conditions may gradually change the material’s chemical profile.

The CAS number helps identify the chemical substance, but it does not always describe every commercial grade detail. For procurement, I treat the CAS number as a starting point and then verify the product form, assay, density if liquid, water content, impurities, and intended use. This approach reduces the risk of comparing a solid ferrous chloride grade with a liquid product on an incompatible basis.

Core Properties of CAS 7758-94-3

Chemical and Physical Characteristics

Anhydrous ferrous chloride is represented by FeCl₂ and has a relative molecular mass of approximately 126.75 g/mol. It is an iron(II) salt that can participate in oxidation-reduction reactions, particularly when exposed to oxidizing conditions. Its appearance can vary according to hydration state, purity, particle size, and manufacturing method, so buyers should rely on the supplier’s current specification rather than a generic visual description.

Ferrous chloride is generally supplied in forms that dissolve in water, although the dissolution behavior and final solution characteristics depend on concentration and temperature. Aqueous products can be easier to meter into continuous treatment systems, while solid products may be preferred where storage volume, transport economics, or on-site solution preparation is important. I recommend evaluating the complete handling system before choosing between these forms.

Important Specification Variables

The most important specifications normally include total iron or ferrous iron content, chloride content, insoluble matter, free acidity, water content, and the presence of other metal impurities. For liquid grades, concentration, density, crystallization behavior, and container compatibility are also relevant. Because analytical methods and reporting bases can differ, the buyer and supplier should agree whether values are reported on an as-is basis, dry basis, or solution basis.

Available Forms and Material Options

Solid Ferrous Chloride

Solid ferrous chloride may be supplied as powder, crystals, flakes, or another agreed physical form, depending on the production and packaging process. Solid material can offer logistical advantages when the customer has suitable dissolution and dosing equipment. However, it requires controlled handling to minimize moisture uptake, oxidation, dust generation, and caking.

Liquid Ferrous Chloride Solution

Liquid solution is often selected for industrial dosing because it can be transferred through pumps and metering systems without an additional dissolution step. Its practical advantages depend on concentration, temperature, storage tank design, and the chemical compatibility of valves, pipes, and seals. Before purchase, I recommend confirming the delivered concentration, minimum storage temperature, expected shelf life, and whether the solution requires agitation or recirculation.

Hydrated or Customer-Specified Grades

Some supply chains use hydrated ferrous chloride or product descriptions that reflect a particular manufacturing route. A hydrate contains associated water and therefore cannot be compared directly with anhydrous FeCl₂ by weight alone. If a process has a strict molar or iron-content requirement, I calculate the required dosage from the actual certificate specification instead of using the nominal product name.

With competitive price and timely delivery, Azeal Materials sincerely hope to be your supplier and partner.

Industrial Uses of CAS 7758-94-3

Water and Wastewater Treatment

Ferrous chloride can be used as an iron-based treatment chemical in selected water and wastewater processes. Its iron(II) content may support coagulation, precipitation, or chemical reduction, depending on the contaminants and process conditions. Actual performance depends on pH, alkalinity, mixing, oxidation conditions, contaminant concentration, and the design of the treatment plant, so jar testing or a controlled process trial may be appropriate before full-scale adoption.

Production of Other Iron Compounds

Ferrous chloride is also used as a feedstock or intermediate for producing other iron-containing chemicals. The suitability of a particular grade depends on the required oxidation state, impurity limits, reaction conditions, and whether the manufacturing process operates in a batch or continuous mode. A consistent assay and controlled impurity profile are usually more important than appearance alone for this application.

Chemical Processing and Metallurgical Applications

Because ferrous chloride participates in redox chemistry, it may be used in selected chemical processing and metallurgical operations. Potential applications include iron-salt preparation, process chemistry, and systems requiring a soluble source of ferrous ions. The correct grade must be matched to the process because unwanted trace metals, excess acidity, or oxidation to ferric species can affect reaction control.

How Buyers Should Select a Suitable Grade

1. Define the Process Requirement

First, I identify whether the product will be used for dosing, synthesis, precipitation, reduction, or another purpose. The required result should be expressed in measurable terms, such as ferrous iron dosage, total iron loading, solution concentration, or impurity tolerance. This prevents a common purchasing error: selecting a material solely because its CAS number appears correct.

2. Confirm Form and Concentration

Next, compare solid and liquid options using the total delivered cost, not only the price per kilogram. For example, a liquid grade may reduce on-site labor, while a solid grade may reduce the amount of water transported. If the buyer needs a solution at 20% concentration, that requirement must be stated clearly because concentration affects density, storage volume, and dosing calculations.

3. Review Documentation and Packaging

I recommend requesting a current specification sheet, safety data sheet, certificate of analysis format, packaging description, and storage guidance. Buyers should also confirm the production batch identification, net weight or volume, labeling requirements, and export documentation needed for the destination country. These details support traceability and help the receiving team handle the product correctly.

Supplier Support from Azeal Materials

At Azeal Materials, I support industrial buyers by clarifying the required ferrous chloride form, specification basis, packaging, and delivery conditions. We can discuss whether a solid or aqueous format is more practical for the customer’s equipment and operating model. Where the application is sensitive to impurities or oxidation, I encourage buyers to provide their internal specification or target composition for review.

Our supply discussion can include product identification, available packaging, order quantity, export requirements, and documentation expectations. I avoid treating one generic grade as suitable for every process because water treatment, chemical manufacturing, and metallurgical applications can have different acceptance criteria. The final recommendation should be based on the buyer’s technical requirement and local compliance obligations.

Conclusion: Is CAS 7758-94-3 Right for Your Application?

CAS 7758-94-3 is commonly associated with ferrous chloride, or iron(II) chloride, an inorganic iron salt used in water treatment, chemical processing, and other industrial applications. Its anhydrous reference formula is FeCl₂, but commercial products may differ by hydration state, physical form, concentration, and impurity profile. Therefore, the CAS number alone is not enough to select a production-grade material.

As a next step, define your application, required ferrous iron content, preferred solid or liquid form, impurity limits, packaging, and expected order volume. Send these details to Azeal Materials for a practical supply review and quotation discussion. I can then help you compare the available product format with your process, storage system, and delivery requirements.

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