Chromium Sulfate Complex: Basicity 33-42%, Cr2O3 content 24-26%

Q: What is the role of chromium sulfate complex in leather production?

It serves as the primary tanning agent that cross-links collagen fibers, making leather more durable, heat-resistant, and less susceptible to biodegradation.

Q: How is chromium sulfate complex typically manufactured?

It's produced by reducing sodium dichromate with reducing agents like sulfur dioxide or glucose in sulfuric acid, followed by concentration and drying.

Component Specifications

Definition

Chromium sulfate complex is a coordination compound formed by chromium(III) ions with sulfate ligands, typically prepared by reducing sodium dichromate with sulfur dioxide or glucose in sulfuric acid. It serves as the primary tanning agent in chrome tanning processes, where it cross-links collagen fibers in animal hides to produce durable, heat-resistant leather with a characteristic blue-green color.

Working Principle

The chromium(III) ions in the complex form coordinate covalent bonds with carboxyl groups on collagen polypeptide chains, creating stable cross-links between protein fibers. This increases the hydrothermal stability, reduces biodegradability, and enhances mechanical properties of the leather.

Materials

Chromium(III) sulfate hydrate [Cr2(SO4)3·xH2O] with basicity typically 33-42%, containing 24-26% Cr2O3 equivalent. May contain masking agents like formate or acetate to control reactivity.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Basicity	33-42%
Appearance	Dark green powder or granules
Solubility	Fully soluble in water
Cr2O3 Content	24-26%
PH (10% Solution)	2.5-3.5

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 5398, DIN 53308

Parent Products

This component is used in the following industrial products

Chrome Tanning Agent Solution

Chrome Tanning Agent Solution is a standardized aqueous solution containing trivalent chromium salts, primarily chromium(III) sulfate, used as the primary tanning agent in modern leather production.

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Engineering Analysis

Risks & Mitigation

Hexavalent chromium formation under certain conditions
Environmental contamination from chromium discharge
Worker exposure to chromium dust

FMEA Triads

Trigger: Improper pH control during tanning
Failure: Incomplete penetration and uneven tanning
Mitigation: Maintain pH 2.8-3.2 during chrome tanning process

Trigger: Oxidation of chromium(III) to chromium(VI)
Failure: Toxic hexavalent chromium formation
Mitigation: Use reducing agents and avoid alkaline conditions

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Chromium(VI) content < 3 mg/kg in final leather per REACH regulations

Test Method

ISO 17075 for chromium(VI) determination in leather

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

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Inspection readiness

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Manufacturers of Chromium Sulfate Complex

Manufacturer profiles associated with Chromium Sulfate Complex.

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Frequently Asked Questions

What is the role of chromium sulfate complex in leather production?

It serves as the primary tanning agent that cross-links collagen fibers, making leather more durable, heat-resistant, and less susceptible to biodegradation.

How is chromium sulfate complex typically manufactured?