Overview
ISO 24263:2020 - "Footwear - Attachment strength of straps, trims and accessories" - specifies a test method to determine the attachment strength of footwear upper components joined to the sole: straps, trims, hooks and eyelets. The standard defines sampling, conditioning, test-piece preparation, apparatus requirements, test procedures and how to report results to quantify attachment strength in newton (N).
Key topics and technical requirements
- Scope: Tests attachment strength of upper straps (≤35 mm width), trims, and hooks/eyelets joined to the sole or upper.
- Apparatus:
- Tensile testing machine with jaw separation rate (100 ± 10) mm/min.
- Force-measuring system compliant with ISO 7500-1 Class 2 (2% accuracy). Typical force range: 0 N to 1 000 N.
- Clamping device/jaws that prevent slipping and do not damage samples; examples are provided for rigid trims and straps.
- Vernier caliper with 0.5 mm divisions; laces with higher attachment strength than the eyelet/hook; cutting tool.
- Sampling and conditioning:
- Straps: at least two shoes tested; width measured at the feather line.
- Trims: at least five trim pieces; testable only if a 1 mm gauge can be inserted between trim and upper.
- Hooks/eyelets: at least five test-pieces from separate uppers or detached uppers.
- Condition samples 24 h before testing per ISO 18454: (23 ± 2) °C and (50 ± 5)% RH.
- Preparation & procedure highlights:
- For straps: make a precise incision ≈ 15 mm from where strap joins sole to isolate the attachment, measure width, clamp shoe and strap, align horizontally and pull until separation.
- For trims: clamp trim and substrate appropriately (use specified rigid trim clamping where needed) and pull until failure.
- For hooks/eyelets: align jaws, pass lace through eyelet/hook and pull until failure; record failure mode.
- Results & reporting:
- Express results in N (maximum force per sample; averages for trims and eyelets where specified).
- Record failure type (strap breakage, sole breakage, detachment, trim breakage).
- Test report must identify the footwear, reference ISO 24263:2020, part tested, results in N, test date and any deviations.
Applications and who uses it
- Footwear manufacturers and component suppliers for quality control and validation of strap, trim, hook and eyelet attachments.
- Testing laboratories and third‑party conformity assessors conducting tensile/attachment strength testing.
- R&D teams assessing designs, materials and fastening methods for durability and safety.
- Procurement and compliance officers who require objective, reproducible attachment-strength data for product specifications.
Related standards
- ISO 7500-1 - Calibration and verification of static uniaxial testing machines (tension/compression) - force measurement requirements.
- ISO 18454 - Standard atmospheres for conditioning and testing of footwear and components.
Keywords: ISO 24263, footwear attachment strength, straps, trims, hooks, eyelets, tensile testing, ISO 7500-1, ISO 18454, test method.