Overview
ISO 10765:2010 - Footwear - Test method for the characterization of elastic materials - Tensile performance - specifies a standardized tensile test and analysis procedure to obtain the strength/elongation graph for any elastic material used in footwear (tapes, cords, fabrics). The method defines sampling, specimen preparation, conditioning, test apparatus and speeds, calculation of characteristic parameters (modulus, elastic gradient, limit of useful extension, maximum extension resistance, extension at break) and reporting requirements.
Key topics and technical requirements
- Scope: Applicable to any elastic material used in footwear upper construction (quarters, straps).
- Sampling & specimen prep: Standard test-piece layout with typical testing length 100 mm (50 mm permitted when material is limited). Prepare three test pieces and sew coated fabric ends to the elastic to permit clamping.
- Conditioning: Samples conditioned at (23 ± 2) °C and (50 ± 5) % RH for at least 24 hours (referenced ISO 18454).
- Apparatus:
- Tensile testing machine capable of autographic recording and crosshead speeds of (100 ± 20) mm/min (or (50 ± 10) mm/min for short pieces).
- Steel ruler, sewing machine (specified needle and thread), polyurethane-coated fabric for end-tabs.
- Measured parameters:
- 20% and 50% modulus (load at fixed extension normalized by specimen width).
- Elastic gradient (EG) - slope of the straight portion of the load/extension curve per unit width.
- Limit of useful extension (LUE) - graphically determined onset of major non-linearity, expressed as % extension.
- Maximum extension resistance and extension at break - peak and rupture extension values from the curve.
- Results & reporting: Average of three specimens; report must reference ISO 10765:2010, material description, moduli (N/cm), EG (N/cm per 1% elongation), LUE (%), maximum resistance (%), extension at break (%) and any deviations.
Applications
- Quality control of elastic components during production or incoming inspection.
- Materials selection for footwear design - matching elasticity, comfort and retention requirements for straps, collars and closures.
- R&D and product development - comparing formulations, constructions and treatments of elastic tapes and fabrics.
- Failure analysis - determining extension at break and onset of undesirable behaviour.
Who uses this standard
- Footwear manufacturers, component suppliers, textile and elastomer labs, independent testing laboratories, product designers and compliance engineers.
Related standards
- ISO 18454 - Standard atmospheres for conditioning and testing of footwear and components.
- Prepared by ISO/TC 216 (Footwear) under the Vienna Agreement with CEN/TC 309.
Keywords: ISO 10765, tensile performance, elastic materials, footwear testing, modulus, elastic gradient, limit of useful extension, tensile test.