Overview
EN ISO 11644:2022 - Leather: Test for adhesion of finish specifies a standardized peel-test method to measure the adhesion of a finish layer to leather or the adhesion between two adjacent finish layers. Published by CEN and based on ISO/IULTCS methods, it applies to finished, flexible leathers with a smooth surface and a thick finish-coat that can be bonded to an adherent plate without adhesive penetration. The document supersedes EN ISO 11644:2009 and is intended for reproducible assessment of finish adhesion under dry and, where applicable, wet conditions.
Key topics and technical requirements
- Scope and exclusions: Valid for finished leathers with continuous coating; excludes unpigmented or non-continuously coated articles such as nubuk, aniline, pull-up, suede and perforated leather.
- Test principle: A strip of leather (finished side) is bonded to a hard adherent plate; the leather is peeled at about 90° and the force required is recorded as the adhesion value.
- Apparatus and materials:
- Tensile-testing machine with uniform separation speed of 100 mm/min ± 5 mm/min and force-distance recording.
- Adherent plate: hard PVC (approx. 70 mm × 20 mm × 3 mm, IR-absorbing PVC preferred).
- Fixtures: plate holder, hook link or flat-jawed clamp to maintain ~90° peel angle.
- Adhesives: fast-setting cyanoacrylate or suitable two-component polyurethane adhesives to avoid penetration into the finish.
- Specimen preparation & conditioning: Standardized sample cutting, conditioning in controlled atmosphere; wet or pre-treated specimen testing permitted when required.
- Reporting and precision: Test report requirements and interlaboratory precision data (informative annex) to ensure consistent results.
Applications and users
EN ISO 11644:2022 is used to:
- Verify finish adhesion during leather product quality control (footwear, upholstery, garments, automotive interiors).
- Support R&D for coating formulations and multi-layer finishes.
- Validate supplier specifications and compliance for finished leather panels.
Primary users include leather technologists, quality assurance engineers, R&D scientists, testing laboratories, and standards/inspection bodies seeking reliable leather finish adhesion data for specification, troubleshooting, or material approval.
Related standards
Relevant referenced standards for sampling, conditioning and reporting include:
- ISO 2418 (sampling location)
- ISO 2419 (sample preparation and conditioning)
- ISO 3696 (laboratory water)
- EN 15987 (leather terminology)
- ISO 105‑A02 (grey scale for color change assessment)
EN ISO 11644:2022 provides a reproducible, industry-accepted method for measuring finish adhesion on finished leather - an essential test for product durability, coating development, and quality assurance.