Overview
ISO 24584:2022 - Textiles - Smart textiles - Test method for sheet resistance of conductive textiles using non-contact type - defines a non‑destructive test method for measuring the sheet resistance of conductive textile structures using eddy current technology in reflection (non‑contact) mode. The standard applies to sheet‑form textiles (woven, knitted, nonwoven, coated fabrics) and multilayer assemblies containing conductive and insulating layers, and is intended for both quality control and design of electronic/smart textile products.
Key Topics
- Measurement principle: uses eddy currents induced by an alternating electromagnetic (primary) field; the secondary field from induced currents is analyzed to determine sheet resistance without electrical contact.
- Apparatus: eddy current instrument (generator/amplifier/demodulator/display), sensor probe (non‑contact), software/device for converting eddy‑current signals to sheet resistance, measurement stage (insulating; recommended thickness 50 mm), and optional pressure plate for bulky/rough specimens.
- Test specimen: recommended size (200 ± 10 mm × 200 ± 10 mm); typically five specimens per sample. Specimens must be flat, wrinkle‑free and conditioned (see ISO 139).
- Calibration & sensor gap: calibration correlates eddy current signal to physical sheet resistance; sensor gap (distance between probe and specimen) is fixed after calibration because signal varies with distance.
- Test procedures: Standard procedure (Method A) and a deviating procedure (Method B) that applies controlled pressure via a pressure plate for rough or thick samples.
- Reporting: includes test conditions, specimen dimensions, calibration data, measurement points and results.
Applications and Users
Practical applications include:
- Quality control of conductive fabrics and coatings during manufacture.
- R&D and product design for smart textiles, wearable electronics, electromagnetic shielding fabrics, and textile interconnects.
- Conformity testing for suppliers and OEMs integrating conductive textiles in garments, medical textiles, sensors or antenna textiles.
Who uses it:
- Textile manufacturers, smart‑textile designers, test laboratories, R&D engineers, material scientists, and OEMs producing wearable electronics or electrically functional textiles.
Related Standards
- ISO 139 - Standard atmospheres for conditioning and testing (referenced)
- ISO 12718 and ISO 15549 - eddy current testing / probe guidance
- IEC 62899‑202‑3 and IEC 63203 series - terminology and thin‑film/electronic textile contexts
Using ISO 24584:2022 helps ensure repeatable, non‑contact measurement of sheet resistance for conductive textiles, enabling reliable material selection, process control and product development in the smart textiles industry.