Overview
ISO 24180:2021 - Textiles - Synthetic filament yarns - Electrostatic propensity evaluation by measuring electrical resistance - defines a laboratory method to evaluate the electrostatic behaviour of synthetic filament yarns by measuring their electrical resistance. The standard covers test specimen preparation, conditioning, apparatus, test procedure, calculation of resistance per unit length and volume resistivity, precision, and reporting. It applies to synthetic filament yarns that include conductive components intended for anti‑static fabrics (not for power, signal transmission, electromagnetic shielding or heating).
Key topics and technical requirements
- Scope and limits: Applies only to synthetic filament yarns used for anti‑static purposes; excludes yarns intended for electrical power, signal transmission, shielding or heating.
- Atmosphere for conditioning/testing: Tests are performed at controlled conditions (nominally 20 ± 2 °C and 40 ± 4 % RH) in line with ISO 139.
- Specimen preparation:
- Cut yarn specimens typically 400–500 mm long.
- Minimum three specimens per package; ≥30 specimens when assessing resistance non‑uniformity.
- Pre‑conditioning and conditioning steps specified (per ISO 139).
- Apparatus:
- DC high‑resistance meter with defined measurement accuracy and open‑circuit voltage.
- Insulating specimen holder with two copper clamps and a pulley; clamp spacing specified (10 ± 0.1 cm).
- Tensioning weight to apply reproducible yarn tension.
- Tensioning:
- Tension per unit linear density is prescribed for non‑textured and textured yarns (different cN/dtex values), and actual tension is calculated from yarn linear density (ISO 2060).
- Measurements and calculations:
- Measure electrical resistance between clamps after energizing the meter (voltage typically 100 V) and reading after 1 minute.
- Calculate resistance per unit length (Ω/m) and volume resistivity (Ω·m) from measured resistance, clamp spacing, yarn linear density and fibre density (Annex A provides typical fibre densities).
- Results reported as arithmetic or geometric mean (scientific notation), with precision criteria given in Annex B.
- Test report: Must include standard reference, sample identification, conditions, results, deviations, and date.
Applications
- Quality control and acceptance testing for anti‑static yarns and fabrics.
- R&D and product development of conductive/anti‑static textiles.
- Supplier verification and material specification compliance for industries requiring electrostatic control (e.g., electronics, cleanrooms, packaging for ESD‑sensitive components).
- Certification and regulatory documentation where electrostatic propensity data are required.
Who should use this standard
- Textile manufacturers and yarn producers
- Textile testing laboratories and QA/QC teams
- Product developers and material engineers working on anti‑static textiles
- Procurement and compliance officers specifying electrostatic performance
Related standards
- ISO 139 - Standard atmospheres for conditioning and testing
- ISO 2060 - Yarn linear density (dtex) by skein method
- ISO 1183‑2 - Density measurement methods (referenced for fibre density)
- ISO 5725‑2 - Precision assessment (referenced in Annex B)
Keywords: ISO 24180:2021, synthetic filament yarns, electrostatic propensity, electrical resistance, volume resistivity, anti‑static yarn testing, textile testing, yarn conditioning.
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