ISO 2062:2009

Overview

ISO 2062:2009 - Textiles - Yarns from packages - Determination of single‑end breaking force and elongation at break using constant rate of extension (CRE) tester - specifies standardized methods to measure the breaking force and elongation at break of single‑strand textile yarns taken from packages. The standard defines four test methods (A, B, C, D), prescribes CRE tensile tester requirements, sampling and conditioning rules, and reporting practices. It applies to most yarn types but excludes several technical yarns (see Key Topics).

Key topics and technical requirements

• Test principle: Single‑end (single‑strand) tensile testing on CRE testers where one clamp is stationary and the other moves at a constant rate of extension.
• Permitted gauge lengths and rates: Usually 500 mm (500 mm/min) or optionally 250 mm (250 mm/min). Automatic testers may use higher rates by agreement.
• Four methods:
  • Method A - Manual; specimens taken directly from conditioned packages.
  • Method B - Automatic; specimens taken automatically from conditioned packages.
  • Method C - Manual; relaxed test skeins used after conditioning (specified for disputes on elongation).
  • Method D - Manual; specimens tested after wetting (gives differing results and used when wet strength/elongation required).
• Apparatus requirements: CRE tester accuracy (force error ≤ 2%), suitable clamps/jaws to prevent slippage or cutting, autographic or direct recording of force and elongation, capability to apply specified pretension.
• Sampling and test numbers: Typical minimums - 50 specimens for single‑spun yarns and 20 for other yarns (with larger sample requirements when determining variability/CV). Sampling procedures reference bulk selection and distribution among packages.
• Conditioning: Preconditioning and conditioning atmospheres per ISO 139; specific preconditioning times (minimums) and moisture equilibrium requirements before testing.
• Exclusions: Not applicable to glass, elastomeric, aramid, HMPE, UHMPE, ceramic and carbon yarns, and polyolefin tape.
• Informative annex: Annex A describes CRT and CRL testers for information only (these are considered obsolete).

Applications and who uses it

ISO 2062:2009 is used by:

• Textile manufacturers and spinners for quality control of yarn strength and elongation.
• Textile testing laboratories and independent test houses for contract testing and certification.
• Product development teams comparing yarn formulations, processing effects (texturing, twisting), and wet‑condition performance.
• Procurement and compliance teams specifying acceptance criteria in material specifications and supply agreements.

Practical applications include acceptance testing of yarn deliveries, batch‑to‑batch quality monitoring, supplier dispute resolution (Method C), and establishing baseline mechanical properties for downstream fabric/process performance.

Related standards

• ISO 139 - Standard atmospheres for conditioning and testing (environmental conditions).
• ISO 2060 - Determination of linear density (skein method).
• ISO 3341 - Method for testing glass yarns (excluded from ISO 2062).
• ISO 6939 - Skein method of testing (alternate yarn testing).