Tannin Compounds: Insolubles ≤1%, Ash Content ≤3%

Component Specifications

Definition

Tannin compounds are complex polyphenolic biomolecules derived from plant tissues such as bark, leaves, fruits, and wood. In industrial leather manufacturing, these compounds function as tanning agents that cross-link collagen fibers in animal hides through hydrogen bonding and hydrophobic interactions. This chemical process stabilizes the protein structure, increases thermal stability, improves resistance to microbial degradation, and imparts characteristic properties like firmness, color, and water resistance to the finished leather product.

Working Principle

Tannin compounds work through a combination of hydrogen bonding, hydrophobic interactions, and covalent bonding with collagen amino groups. The polyphenolic hydroxyl groups form multiple hydrogen bonds with peptide bonds in collagen fibers, creating a three-dimensional network that prevents fiber slippage and shrinkage. This cross-linking action increases the denaturation temperature of collagen from approximately 40°C to over 80°C, transforming perishable raw hides into stable, durable leather materials.

Materials

Natural vegetable tannins extracted from quebracho wood, chestnut wood, oak bark, mimosa bark, tara pods, or myrobalan nuts. Commercial extracts typically contain 60-75% tannins, 20-30% non-tannins (sugars, organic acids), and 3-8% moisture. Particle size: 80-200 mesh powder. Solubility: Water-soluble at concentrations up to 30% w/v.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Insolubles	≤1%
Ash Content	≤3%
Color Index	Light brown to dark brown
Bulk Density	0.5-0.7 g/cm³
Tannin Content	65-75%
Solubility Time	≤30 minutes
Moisture Content	≤8%
PH (10% Solution)	3.5-4.5

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 5398-1, ISO 5398-2, DIN 53308, IULTCS/IUP 2

Parent Products

This component is used in the following industrial products

Vegetable Tanning Extract Powder

Vegetable Tanning Extract Powder is a concentrated natural tannin material derived from plant sources such as quebracho, chestnut, or mimosa.

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Engineering Analysis

Risks & Mitigation

Dust explosion hazard during powder handling
Potential allergic reactions to tannin dust
Variable quality depending on plant source and extraction method
Longer processing time compared to chrome tanning
pH sensitivity affecting tanning efficiency

FMEA Triads

Trigger: Inconsistent raw material quality from different plant sources
Failure: Variable leather properties including color, firmness, and durability
Mitigation: Implement strict supplier qualification, batch testing for tannin content and purity, and standardized blending procedures

Trigger: Improper dissolution leading to incomplete tannin activation
Failure: Uneven tanning, weak spots in leather, reduced product quality
Mitigation: Use controlled temperature water (40-50°C), proper agitation systems, and standardized dissolution protocols

Trigger: Oxidation of tannins during storage or processing
Failure: Darkening of leather, reduced tanning efficiency, inconsistent results
Mitigation: Store in airtight containers away from light and moisture, use antioxidants in tanning baths, implement FIFO inventory management

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±2% tannin content variation between batches, pH tolerance ±0.3 units

Test Method

ISO 5398-1 for tannin content determination, ISO 5398-2 for non-tannin content, IULTCS/IUP 2 for leather shrinkage temperature measurement

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

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Tannin Compounds

Manufacturer profiles associated with Tannin Compounds.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

Frequently Asked Questions

What is the difference between condensed and hydrolyzable tannins?

Condensed tannins (proanthocyanidins) from quebracho and mimosa have higher molecular weight and create firmer leather with better filling properties. Hydrolyzable tannins from chestnut and tara contain gallic or ellagic acid esters and produce softer, more pliable leather with different color characteristics.

How do tannin compounds affect leather quality?

Tannin compounds determine leather characteristics including firmness, grain tightness, color development, thermal stability, and aging properties. Proper selection and blending of tannin sources allows manufacturers to achieve specific leather qualities for different applications.

What are the environmental advantages of vegetable tanning?

Vegetable tanning with tannin compounds is more sustainable than chrome tanning, producing biodegradable leather with lower environmental impact. The process uses renewable plant resources and generates less toxic wastewater.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

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.

Tannin Compounds