SIST EN ISO 7979:2025 – Leather Colour Fastness to Hydroalcoholic Mixtures Test Instrument

SIST EN ISO 7979:2025 - Leather: Tests for colour fastness to hydroalcoholic mixtures specifies standardized laboratory methods to assess leather surface resistance to hydroalcoholic solutions (alcohol + water-based). Prepared by IULTCS in collaboration with CEN/TC 289 and published as a European Standard, it applies to all leather types and addresses exposures typical of disinfectants and cleaning solutions.

Key Topics and Technical Requirements

Scope and Purpose

Evaluates surface fastness of leather against hydroalcoholic test media.

Two principal test methods:

Method 1 – Surface Wetting: Apply test medium to leather via wetted fabric.

Method 2 – Linear Rubbing/Abrasion: Wool felt or cotton fabric soaked in test medium is rubbed in a controlled manner (Procedures A & B).

Evaluation

Visual inspection using standardized grey scales (ISO 105-A02 for colour change, ISO 105-A03 for staining).

Instrumental assessment optional.

Annex provides a visual evaluation scheme.

Conditioning and Atmosphere

Test specimens conditioned per ISO 2419 before testing.

Apparatus and Materials

Distilled/de-ionized water (ISO 3696).

Pipettes, Petri dishes, glass plates.

ISO 105-F09 cotton cloth, ISO 11640 wool felt.

Polyurethane foam, heating cabinet with air circulation.

Chemicals: benzalkonium chloride, ethanol, 2-propanol, glycerine, sodium lauryl ether sulfate (0.5%).

Test Media

Standard hydroalcoholic mixtures (e.g., 70% ethanol) or customer-specific compositions.

Mixtures prepared and agreed upon between supplier and client.

Procedure Highlights

Condition leather specimens per ISO 2419.

Apply hydroalcoholic medium via fabric (surface wetting) or rubbing method.

Allow exposure for prescribed duration.

Evaluate colour change and staining using grey scales or instrumentally.

Document all parameters, deviations, and observations.

Applications and Users

Leather tanners and finishers: Validate treatments against alcohol-based cleaners/disinfectants.

Leather goods manufacturers: Footwear, upholstery, automotive interiors, garments, and accessories.

Quality control laboratories: Routine and type-testing.

Specifiers and procurement: Define acceptance criteria and technical specifications.

Healthcare and institutional suppliers: Assess leather surfaces exposed to sanitizing solutions.

Related Standards

ISO 2419 – Conditioning of leather specimens.

ISO 11640 – Crocking/rubbing test.

ISO 7906 – General principles of leather colour fastness testing.

ISO 105-A02 / A03 – Grey scales for colour change and staining.

ISO 105-F09 – Cotton rubbing cloth.

ISO 12947-1 – Abrasion materials.

ISO 20433, EN 15987, ISO 15115 – Additional references for materials and test procedures.

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2026-01-06 17:57