Overview
EN ISO 24263:2020 - Footwear: Attachment strength of straps, trims and accessories specifies a laboratory method to determine the attachment strength of footwear upper components joined to the sole, and of hooks, eyelets and trims. Prepared by ISO/TC 216 (Footwear) and adopted by CEN (as EN ISO 24263:2020), the standard defines test apparatus, sample preparation, conditioning, test procedures and how to report results for tensile attachment testing.
Key topics and technical requirements
- Scope: Measures attachment strength of upper straps (≤35 mm width), trims, hooks and eyelets joined to the sole or upper.
- Apparatus:
- Tensile testing machine with jaw separation rate (100 ± 10) mm/min.
- Force-measuring accuracy Class 2 per ISO 7500-1; common force range 0–1 000 N.
- Clamping devices/jaws sized to hold samples without cutting or slipping (examples provided for trims and straps).
- Vernier calliper with 0.5 mm divisions; laces with higher strength than eyelets/hooks.
- Sampling & conditioning:
- Straps: test at least two shoes; measure strap width at feather line.
- Trims: test at least five pieces; test pieces must allow a 1 mm gauge insertion between trim and upper.
- Hooks/eyelets: test at least five test-pieces from separate uppers or detached uppers.
- Condition samples 24 h at (23 ± 2) °C and (50 ± 5) % RH per ISO 18454.
- Preparation & procedure:
- Straps: make an incision ~15 mm from the strap–sole join so the strap is cut but not sole material; clamp shoe and strap to simulate in-use tension; record force to separate strap.
- Trims: clamp trim and test-piece, run tensile test; record maximum force and failure mode.
- Hooks/eyelets: align jaw center with eyelet/hook, pass lace through and load until failure; record maximum force and failure type.
- Results & reporting:
- Results expressed in Newton (N).
- For straps include individual maximum force and strap width; for trims and eyelets report average/maximum values and failure mode (detachment, breakage, sole failure).
Applications and users
- Footwear manufacturers and component suppliers (straps, trims, eyelets, hooks) use EN ISO 24263:2020 for quality control, design validation and supplier verification.
- Test laboratories and R&D teams apply the method to compare attachment options, evaluate durability, and support product specifications.
- Compliance and standards specialists reference this standard when specifying test methods in product requirements or procurement.
Related standards
- ISO 7500-1 - Calibration and verification of static uniaxial testing machines (tension/compression).
- ISO 18454 - Standard atmospheres for conditioning and testing footwear and components.
Keywords: EN ISO 24263:2020, attachment strength, footwear straps, trims, eyelets, hooks, tensile testing, conditioning, footwear testing.
