SIST EN ISO 25089:2025 – Leather Sea Water Fastness Test Apparatus

SIST EN ISO 25089:2025 – Leather: Tests for colour fastness to sea water specifies a laboratory method to evaluate how leather resists colour change and staining when exposed to sea water. This European standard, prepared with IULTCS and CEN/TC 289 input, applies to all leather types at all stages of processing. The test provides reproducible data for quality control, R&D, and material specification.

Test Principle

A leather specimen is exposed to a sodium chloride solution simulating sea water. The method measures:

Colour change of the leather

Staining of an adjacent fabric

Results are assessed visually using grey scales or instrumentally using a spectrophotometer/colorimeter.

Test Instruments & Equipment

Pressure apparatus: Applies 12.5 kPa ±1.0 kPa via a defined weight-piece and inert plates (glass or acrylic).

Vacuum desiccator: Removes entrapped air from specimens (≈5 kPa).

Oven: Maintains 37 °C ±2 °C for drying.

Adjacent fabrics: Multifibre (ISO 105-F10) or single-fibre fabrics (ISO 105-F01…F07).

Spectrophotometer or colorimeter: Optional for instrumental evaluation of colour change and staining.

Laboratory-grade sodium chloride solution: 30 g/l prepared with water complying with ISO 3696.

Specimen Preparation & Conditioning

Typical test-piece size: ~100 mm × 40 mm.

Finished leather can be tested intact or with broken finish (abrasion using P180 abrasive paper).

Condition specimens per ISO 2418 and ISO 2419.

Test Procedure

Prepare sodium chloride solution (30 g/l) and condition apparatus.

Apply vacuum treatment to remove air from specimens.

Assemble test-piece with adjacent fabric and place under the pressure apparatus.

Maintain defined pressure (12.5 kPa ±1.0 kPa) for the required exposure time.

Dry specimens in oven at 37 °C ±2 °C.

Evaluate colour change and staining using ISO 105 grey scales or instrumental measurement.

Results Reporting

Include specimen ID, size, whether finish was broken, test medium, apparatus details, exposure time, and evaluation method.

Record grey scale ratings or instrumentally measured colour differences.

Note any deviations from the standard procedure.

Applications & Users

SIST EN ISO 25089:2025 is primarily used to:

Verify leather performance in marine environments (footwear, upholstery, garments, automotive leather, leather goods).

Support quality control in tanneries, leather finishing plants, and contract testing laboratories.

Provide objective data for material specifications, supplier approvals, and product claims.

Aid R&D teams developing dyes, finishes, and treatments with improved sea-water resistance.

Primary Users:

Leather manufacturers and finishers

Independent testing laboratories and certification bodies

Product designers, specifiers, and procurement professionals in marine/outdoor sectors

Regulatory and compliance personnel

Related Standards

ISO 7906 – General principles of leather colour fastness testing

ISO 105 series (A02, A03, A04, A05, F01–F10) – Grey scales, adjacent fabrics, instrumental assessment

ISO 2418 – Specimen sampling and preparation

ISO 3696 – Water for analytical laboratory use

Qinsun Instruments is a professional instrument equipment manufacturer, providing one-stop solutions for all leather testing and laboratory needs.

2026-01-06 17:52