Overview
ISO 14087:2022 is an internationally recognized standard specifying the test method for determining the bending force of leather. This physical and mechanical test focuses on assessing leather's flexibility and durability by measuring the force it exerts when bent at a specific angle. The standard is developed by ISO in collaboration with the International Union of Leather Technologists and Chemists Societies (IULTCS) and provides a consistent procedure for accurate and repeatable results.
Leather manufacturers, quality control laboratories, and product designers rely on ISO 14087:2022 for evaluating leather’s bending resistance, which is critical for applications where flexibility, wear resistance, and mechanical performance are key. The method ensures standardized testing conditions, improving product comparability and compliance with international quality benchmarks.
Key Topics
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Scope and Purpose
Defines the determination of leather bending force using a two-point bar bending method, ideal for understanding leather’s mechanical behavior.
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Definitions
Essential terms such as bending force, bending angle, bending length, bending rate, compression bending, and extension bending are clearly outlined to maintain uniform interpretation.
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Test Principle
The leather specimen is clamped vertically in a rotating fixture and bent against a vertical metering bar. The force exerted by the leather during bending at specified angles is measured precisely.
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Apparatus Requirements
Detailed specifications include:
- Clamping device with specific jaw dimensions ensuring even pressure distribution.
- Rotational mechanism with adjustable angles and speeds.
- Load cell-connected metering bar with high-precision force measurement capabilities (up to 10 N).
- Use of torque wrench for controlled clamping pressure.
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Sampling and Preparation
Test samples are prepared and conditioned following ISO 2418 and ISO 2419 requirements. Multiple orientations relative to the leather backbone must be tested to reflect anisotropic properties.
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Testing Procedure
Includes single-use testing of each specimen at defined bending angles and rates. Both compression (grain side bending inward) and extension bending (grain side bending outward) are measured, depending on the test setup.
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Reporting
The test report must contain reference to the standard, specimen description, thickness measurements, test parameters, measured bending forces (compression and/or extension), and any deviations from the standard.
Applications
ISO 14087:2022 is critical for industries involved in:
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Leather Goods Manufacturing
Ensuring materials meet flexibility and mechanical standards for products like footwear, upholstery, and fashion accessories.
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Quality Control Laboratories
Standardized bending force testing supports batch certification and quality assurance activities.
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Product Development and Research
Facilitating comparative evaluations of leather treatments, finishes, or tanning methods that affect mechanical flexibility.
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Compliance and Certification
Meeting international trade requirements and customer specifications related to physical performance of leather materials.
Related Standards
For comprehensive leather testing, ISO 14087:2022 is closely linked with other key standards:
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ISO 2418 – Leather Sampling Location: Guides precise sampling to ensure representative test specimens.
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ISO 2419 – Sample Preparation and Conditioning for Physical Tests: Ensures standard environmental conditions and specimen conditioning prior to testing.
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ISO 2589 – Determination of Leather Thickness: Thickness measurement complements bending force data by correlating mechanical behavior with leather thickness.
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ISO 7500-1 – Calibration of Uniaxial Testing Machines: Ensures force-measuring equipment complies with class 2 accuracy requirements for reliable results.
By following ISO 14087:2022, stakeholders in the leather industry can consistently measure and report the bending force of leather, supporting product quality, functional performance, and customer satisfaction on a global scale.
