Chromium(III) Sulfate, CAS 10101-53-8, also called chromic sulfate, is a trivalent chromium salt for industrial plating, surface treatment and dyestuff processes. Material form, chromium-content basis and the Cr(VI) limit define the specification for each order.
Chromium(III) Sulfate CAS 10101-53-8
- CAS: 10101-53-8
- Synonyms: Chromium(III) sulfate; Chromic sulfate; Chromium(III) sulphate
- Einecs: 233-253-2
- Molecular Formula: Cr₂(SO₄)₃
- Grade: Chromium(III) sulfate industrial specifications: form, chromium-content basis and impurity limits agreed with the order
- Package: Chromium(III) sulfate: sealed packaging suited to the quoted solid or solution; pack type and net weight agreed with the quotation
Product Description
Chromium(III) sulfate identity and product form
Chromium(III) sulfate, or chromic sulfate, has the sulfate formula Cr₂(SO₄)₃ and EC number 233-253-2. Commercial products can be hydrated solids or aqueous solutions; hydration and concentration affect chromium content, appearance and dissolution behavior. Green or violet color alone does not establish composition or grade. Cr(III) is distinct from the Cr(VI) in chromates and dichromates.
Basic chromium sulfate includes hydroxide and has a specified basicity. It requires a different specification from ordinary chromium(III) sulfate, even when a commercial document lists the base sulfate CAS. Leather-tanning suitability cannot be inferred from CAS 10101-53-8 alone.
Chromium(III) sulfate is a chromium source for selected trivalent chromium plating and surface-treatment formulations, and for dyestuff and mordant processes. For chloride-based formulations, anhydrous chromium(III) chloride is a different chromium source. Sulfate and chloride salts differ in counterion, chromium content and dissolution route; they are not equal-weight, drop-in substitutes.
Some trivalent chromium plating formulations use glycine as a complexing ingredient, boric acid as a buffer, or sodium formate as a formate source. These materials have different functions and are selected for the validated bath formulation; they do not replace chromium(III) sulfate.
Specifications and chromium analysis
Chromium content may be expressed as elemental Cr, Cr₂O₃ equivalent or chromium sulfate. These percentages are not interchangeable. The specification states the reporting basis, as-supplied or dry basis, and the solid form or solution concentration. Depending on the process, relevant controls include insoluble matter, acidity or basicity, Cr(VI), chloride, iron and other metals. Solution density also needs a stated measurement temperature.
A suitable validated titration or ICP-OES method can determine chromium content, but ICP-OES alone does not distinguish Cr(III) from Cr(VI). A Cr(VI) limit requires a separate selective method, such as diphenylcarbazide spectrophotometry or ion chromatography with post-column detection. Preparation, dilution, recovery and reporting limits must be validated for the colored, sulfate-rich product matrix; ion chromatography is not a general test of salt purity.
Quality documents, packaging and quotation
We can provide a Certificate of Analysis (COA), Technical Data Sheet (TDS) and Safety Data Sheet (SDS), together with applicable chromium-assay and impurity-test information. Where a validated ion-chromatographic Cr(VI) test is specified, the corresponding chromatographic report can also be provided. Solids require suitable sealed packaging protected from moisture; solutions use compatible containers. Send the intended process, quantity and destination for a quotation with the agreed form, pack type and net weight.
FAQ - Technical & Supply Chain
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Q:
Is Chromium(III) Sulfate CAS 10101-53-8 the same product as Basic Chromium Sulfate?
A: They require different specifications. Ordinary chromium(III) sulfate is represented by Cr₂(SO₄)₃; basic chromium sulfate includes hydroxide and specified basicity. Commercial documents can list the base sulfate CAS for a basic product or mixture, so CAS alone does not establish composition or leather-tanning suitability. -
Q:
What is Chromium(III) Sulfate used for?
A: It supplies trivalent chromium in selected plating and surface-treatment formulations and in dyestuff or mordant processes. Material form, chromium content and impurity limits must suit the process. A tanning grade needs its own composition and basicity specification. -
Q:
What does chromium content mean in a Chromium(III) Sulfate specification?
A: The result may be stated as elemental Cr, Cr₂O₃ equivalent or chromium sulfate, on an as-supplied or dry basis. The basis must be identified together with hydration or solution concentration. Cr₂O₃ equivalent is a reporting conversion, not a claim that the product is chromium oxide. -
Q:
How are chromium content and Cr(VI) tested in Chromium(III) Sulfate?
A: A suitable validated titration or ICP-OES method measures chromium content. ICP-OES alone cannot separate chromium oxidation states. Cr(VI) needs a selective method with preparation, recovery and a reporting limit validated for the sulfate-rich matrix; diphenylcarbazide spectrophotometry and ion chromatography with post-column detection are possible methods. -
Q:
What information is needed for a Chromium(III) Sulfate quotation?
A: Send the intended process, quantity, destination and any required form, concentration or chromium-content basis. We can quote against agreed impurity limits and packaging requirements; pack type and net weight are specified with the offer.
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