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Chromium Sulfate Complex Component – Leather and Related Product Manufacturing

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

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

Standards

ISO 5398, DIN 53308

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Chromium Sulfate Complex.

Parent Products

This component is used in the following industrial products

Chrome Tanning Agent Solution

Industrial chromium-based chemical solution for leather tanning

View Product Details

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

Interchangeable Parts

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

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation

4/5

Manufacturing capability

4/5

Inspection readiness

5/5

Supplier transparency

3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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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?

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

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Chromium Sulfate Complex