What Is CAS 7758-94-3? Anhydrous Ferrous Chloride Properties, Uses, and Specifications
CAS 7758-94-3 identifies anhydrous ferrous chloride, an inorganic iron(II) salt with the formula FeCl2. It is used as an iron source and reducing agent in selected industrial and chemical processes, including water treatment and chemical manufacturing. Its commonly reported molar mass is 126.75 g/mol, and it is moisture-sensitive, so buyers should confirm that the product is specifically the anhydrous form rather than a hydrated grade. For procurement, the right specification depends on the intended process, required purity, moisture limits, packaging, and documentation.
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What Is Anhydrous Ferrous Chloride?
Anhydrous ferrous chloride is the water-free form of ferrous chloride. “Ferrous” refers to iron in the +2 oxidation state, while chloride is the negatively charged counterion. The CAS number helps distinguish this chemical identity in purchasing and safety documentation, but it does not by itself define a commercial grade, purity level, or particle-size specification.
The material is generally described as a crystalline solid that can appear pale green, gray-green, or off-white depending on its condition and product grade. It is hygroscopic, meaning it can take up moisture from its surroundings. Exposure to moisture may affect the material’s condition and can lead to formation of hydrated ferrous chloride, so storage and handling conditions matter.
Identity and Basic Properties
| Property | Information |
|---|---|
| Product name | Anhydrous ferrous chloride; iron(II) chloride |
| CAS number | 7758-94-3 |
| Chemical formula | FeCl2 |
| Molar mass | 126.75 g/mol |
| Commonly reported melting point | Approximately 677 °C |
| Key handling consideration | Protect from moisture; consult the product SDS for handling requirements |
Physical-property values can vary by source, measurement conditions, and product condition. The melting point shown is a commonly reported reference value, not a guarantee of a particular supplied lot’s performance. For formal qualification, buyers should request the current technical data and lot-specific documentation for the material they plan to purchase.
Core Functions and Chemical Behavior
Ferrous chloride provides iron in the +2 oxidation state and chloride ions. In solution, it can serve as an iron-bearing reagent for processes that require ferrous ions. It can also participate in redox chemistry, where iron(II) may be oxidized to iron(III), depending on the reaction conditions and other materials present.
These properties make the compound useful as a process input rather than a universal treatment chemical. Its suitability depends on factors such as solution chemistry, pH, oxidation conditions, contaminants, and the required final product. Buyers should evaluate it against their process requirements instead of relying on the chemical name alone.
Common Application Scenarios
Water and Wastewater Treatment
Ferrous salts may be used in water and wastewater processes as iron sources or reducing agents, depending on the treatment design. Anhydrous ferrous chloride can be considered where a dry, concentrated feedstock is appropriate and the facility can safely manage its moisture-sensitive solid form. The required dosage and performance depend on the water chemistry and treatment objective, so pilot or process-specific evaluation may be appropriate.
Chemical Manufacturing and Synthesis
In chemical production, ferrous chloride may be used as a reagent, catalyst component, or precursor where iron(II) chemistry is required. It may also serve as a starting material for further iron-containing products. The selected grade should match the reaction’s impurity tolerance, moisture sensitivity, and handling controls.
Metal and Materials Processes
Some metal-processing or materials applications use ferrous chloride as a source of iron or chloride ions. Actual suitability depends on the process design and downstream product requirements. Buyers should confirm that trace impurities and water content will not interfere with the intended operation.
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Types and Material Options
The most important distinction in sourcing is between anhydrous ferrous chloride and hydrated ferrous chloride. Hydrated material contains water in its crystal structure and has a different composition and molar mass. A commonly listed tetrahydrate is associated with CAS 13478-10-9; it should not be treated as interchangeable with the anhydrous product identified by CAS 7758-94-3.
Commercial offerings may also differ by purity, impurity profile, particle size, packaging, and intended use. These are grade and supply details, not properties established by the CAS number. When requesting a quotation, specify the anhydrous form explicitly and state any critical limits for moisture, assay, or trace metals.
Key Specifications to Review
A useful specification sheet should identify the chemical name, CAS number, formula, grade, and test methods used for reported values. Buyers commonly review assay, moisture or water content, appearance, and relevant impurity limits. If particle size or packaging affects feeding and storage, include those requirements in the inquiry rather than assuming they are standard.
- Identity: Confirm CAS 7758-94-3 and FeCl2, and verify that the product is anhydrous.
- Assay: Set the required value or range according to the process and the supplier’s available grade.
- Moisture: Establish an acceptable limit and clarify the measurement method when water content is critical.
- Impurities: Identify specific elements or contaminants that could affect product quality or process performance.
- Physical form: Specify particle-size or flow characteristics if needed for dosing and equipment compatibility.
- Documentation: Request a lot-specific certificate of analysis (CoA) and safety data sheet (SDS), as applicable.
Do not assume that a general catalog description guarantees a particular numeric specification. Confirm the agreed limits, analytical methods, and acceptance criteria in writing before placing an order. This is especially important when comparing quotations from suppliers offering different grades.
How B2B Buyers Can Select the Right Grade
Begin with the intended application and identify which product attributes directly affect performance. A process that requires iron(II) content may prioritize assay and oxidation control, while a moisture-sensitive reaction may place greater emphasis on water content and packaging. For water treatment or other variable feed applications, confirm how the solid will be dissolved, stored, and dosed at the facility.
- Define the process: Share the application, expected consumption, and any process-specific constraints.
- Separate essential limits from preferences: Identify mandatory assay, moisture, impurity, and particle-size criteria.
- Confirm the material form: State “anhydrous ferrous chloride, CAS 7758-94-3” to avoid confusion with a hydrate.
- Check handling compatibility: Review packaging, storage, and moisture-control needs with your technical and safety teams.
- Evaluate documentation and supply terms: Confirm available CoA and SDS documentation, packaging options, quantity, and delivery requirements.
Cost should be assessed alongside specification fit and handling requirements. A lower-priced material may not be a practical choice if its moisture level, impurity profile, or packaging is unsuitable for the process. Request comparable information from each supplier so that quotations reflect the same grade and delivery basis.
Supplier Support from Azeal Materials
At Azeal Materials, we support B2B inquiries for chemicals by helping buyers clarify product identity, grade requirements, and purchasing details. For anhydrous ferrous chloride, provide the CAS number, target specification, intended application, quantity, and preferred packaging in your inquiry. This information helps us assess the request and confirm the relevant product and documentation options.
Before purchase, ask for the current product specification and the documentation available for the supplied lot. Buyers should also review the SDS and confirm that their receiving, storage, and handling procedures are appropriate for a moisture-sensitive chemical. Availability, packaging, and order terms should be confirmed during quotation rather than assumed from a general product description.
Key Takeaways and Next Steps
- CAS 7758-94-3 identifies anhydrous ferrous chloride, FeCl2, with a molar mass of 126.75 g/mol.
- It is a moisture-sensitive iron(II) salt used as a process reagent or iron source in selected applications.
- Do not confuse the anhydrous material with hydrated ferrous chloride; confirm the CAS number and water-content requirements.
- Specify assay, moisture, impurities, physical form, packaging, and documentation needs before comparing suppliers.
In short, CAS 7758-94-3 is the identifier for anhydrous ferrous chloride, but the CAS number alone is not a purchasing specification. To move forward, define the application and critical limits, then request a matching specification, lot documentation, and supply quotation. Contact Azeal Materials with your required grade, quantity, and packaging preferences to discuss an appropriate B2B supply option.