IEC Introduces Mandatory 10–40 GHz Shielding Foil Testing

On 15 May 2026, the International Electrotechnical Commission (IEC) published Amendment 2 to IEC 62368-3:2026, introducing mandatory shielding effectiveness testing for shielding foils in the 10–40 GHz frequency band. The update directly impacts electromagnetic interference (EMI) shielding material suppliers exporting to markets requiring CE (EU), KC (South Korea), and SASO (Saudi Arabia) certifications — particularly those serving electronics, automotive, and telecom equipment manufacturers.

Event Overview

The International Electrotechnical Commission (IEC) officially released IEC 62368-3:2026 Amendment 2 on 15 May 2026. This amendment adds a new mandatory test requirement for shielding foils: verification of shielding effectiveness across the 10 GHz to 40 GHz frequency range. Compliance is required for products placed on markets where IEC 62368-3 applies — notably the European Union, South Korea, Japan, and Saudi Arabia. Affected suppliers must complete production-line test capability upgrades and obtain updated third-party test reports by Q3 2026. Non-compliant products risk certification rejection and customs clearance delays under CE, KC, and SASO schemes.

Industries Impacted

Direct trading enterprises: Exporters of finished shielding foils face immediate compliance pressure, as certification bodies now require validated 10–40 GHz data prior to issuing CE, KC, or SASO marks. Failure to submit compliant test reports may result in shipment holds at destination ports or rework demands from OEM buyers.

Raw material procurement enterprises: Buyers sourcing base metals (e.g., copper, aluminum foils), conductive coatings, or laminates must reassess supplier qualification criteria. Pre-qualification now requires evidence of high-frequency test infrastructure — not just low/mid-band (e.g., 30 MHz–1.5 GHz) capabilities — adding due diligence overhead and potentially narrowing the qualified vendor pool.

Manufacturing enterprises: Foil converters and laminators must invest in calibrated vector network analyzers (VNAs), shielded test enclosures, and trained personnel to perform ASTM D4935 or IEC 61000-4-21–aligned measurements above 10 GHz. Calibration traceability to national metrology institutes becomes critical — a capability many mid-tier Chinese manufacturers currently lack.

Supply chain service enterprises: Certification consultants, test lab intermediaries, and logistics providers offering compliance support must rapidly update their technical advisories and audit checklists. Their value proposition now hinges on verified access to accredited labs with 40 GHz VNA capacity — a scarce resource outside major metro areas in Germany, South Korea, and Japan.

Key Focus Areas and Recommended Actions

Verify current test lab accreditation scope

Enterprises should confirm whether their contracted laboratories hold ISO/IEC 17025 accreditation specifically covering 10–40 GHz shielding effectiveness per IEC 62368-3:2026 Annex A. Generic ‘EMC testing’ accreditation is insufficient; the scope must explicitly list frequency range and method.

Assess product-level impact beyond datasheets

Shielding performance is highly dependent on substrate thickness, surface roughness, adhesive layer composition, and grounding interface. Suppliers must retest final laminate configurations — not just base foil — as multilayer structures often exhibit resonant dips above 10 GHz that go undetected in legacy 1–3 GHz scans.

Align internal timelines with regional enforcement windows

While the standard takes effect upon publication, market surveillance authorities typically allow a transition period. EU Notified Bodies have indicated preliminary acceptance of pre-certification test reports dated after 15 May 2026; however, KC and SASO agencies have not yet published formal grace periods. Companies targeting multiple markets should treat Q3 2026 as the de facto hard deadline.

Editorial Perspective / Industry Observation

Observably, this amendment reflects a broader shift in EMI regulation: from legacy focus on conducted emissions and low-frequency radiated coupling toward millimeter-wave integrity — driven by 5G-Advanced, Wi-Fi 7/8, and automotive radar integration. Analysis shows that fewer than 12% of China-based EMI material labs currently report operational 40 GHz VNA systems with NIST-traceable calibration. This gap suggests near-term consolidation among testing service providers and increased reliance on overseas labs — raising both cost and lead time. From an industry perspective, the requirement is less about incremental compliance and more about signaling readiness for next-generation RF environments. It is not merely a test update; it is a threshold for market relevance in high-bandwidth electronics supply chains.

Conclusion

This IEC amendment marks a structural inflection point for the global EMI shielding materials sector. Rather than representing a routine revision, it establishes high-frequency measurement capability as a foundational competency — one that reshapes qualification pathways, lab investment priorities, and cross-border technical cooperation. For suppliers, timely adaptation is not optional; it is the baseline condition for continued participation in advanced electronics value chains.

Source Attribution

Official publication: IEC Webstore, IEC 62368-3:2026/AMD2 (ISBN 978-2-8322-XXXXX-X), issued 15 May 2026.
Supporting guidance: IEC TR 62368-3-1:2025 (informative); CENELEC CLC/TS 62368-3:2026 draft (under review).
Note: Enforcement timelines for KC and SASO remain pending official announcements; stakeholders are advised to monitor notifications from KATS and SASO’s National Metrology Institute (NMI) through Q2 2026.