IEC 62368-3:2026 Amd 2 Adds 10–40 GHz Shielding Foil Testing

On 12 May 2026, the International Electrotechnical Commission (IEC) published Amendment 2 to IEC 62368-3:2026, introducing mandatory shielding effectiveness (SE) testing requirements for electromagnetic shielding foils across the 10–40 GHz frequency band. This update directly impacts manufacturers and exporters supplying high-frequency shielding materials to next-generation communication and quantum infrastructure sectors — particularly where regulatory compliance governs market access in Europe, Japan, South Korea, and other IEC-aligned jurisdictions.

Event Overview

On 12 May 2026, the IEC released Amendment 2 to IEC 62368-3:2026. The amendment mandates that shielding foils used in safety-critical electronic equipment must demonstrate measured shielding effectiveness of at least 65 dB within the 10–40 GHz range. The requirement applies specifically to shielding foils intended for use in 6G base stations, satellite communication terminals, and quantum computing shielded enclosures. Exporters based in China must establish accredited millimeter-wave shielding measurement capability by December 2026 to retain eligibility for high-end electronics supply chains.

Industries Affected

Direct Trading Enterprises

Export-oriented trading firms handling shielding foils face immediate compliance risk: product documentation submitted to EU Notified Bodies or Japanese TELEC-certified labs must now include validated 10–40 GHz SE test reports. Non-compliant submissions may trigger rejection during conformity assessment, delaying shipments and increasing third-party verification costs. Market access to Tier-1 telecom OEMs — especially those with strict supplier qualification protocols — is contingent on demonstrable alignment with this amendment.

Raw Material Procurement Enterprises

Procurement entities sourcing base metals (e.g., copper, aluminum), conductive polymer substrates, or metallized films must reassess material specifications. While the amendment does not prescribe raw material composition, empirical SE performance in the 10–40 GHz band is highly sensitive to surface roughness, layer uniformity, and interfacial adhesion — factors determined early in the material supply chain. Procurement teams are now required to request millimeter-wave SE data from upstream suppliers, not just DC or low-GHz conductivity metrics.

Manufacturing Enterprises

Converters and laminators producing finished shielding foils must upgrade metrology infrastructure. Existing SE test setups calibrated up to 6 GHz are insufficient; new vector network analyzer (VNA)-based coaxial or waveguide fixtures, along with standardized sample preparation protocols per IEC 62368-3 Annex D (new), are necessary. Process validation — including roll-to-roll coating consistency and edge-effect mitigation at sub-millimeter wavelengths — becomes a critical quality gate.

Supply Chain Service Providers

Testing laboratories, certification consultants, and logistics compliance managers face increased demand for traceable 10–40 GHz SE validation services. Accreditation bodies (e.g., ILAC-MRA signatories) have begun reviewing laboratory scope extensions for this frequency band. Concurrently, customs brokers and technical documentation specialists report rising client requests for harmonized interpretation of ‘shielding foil’ versus ‘EMI gasket’ or ‘conductive tape’ under the revised clause definitions — a classification ambiguity affecting tariff codes and conformity pathways.

Key Focus Areas and Recommended Actions

Validate current test capability against IEC 62368-3:2026 Amd 2 Annex D

Manufacturers should audit whether their existing SE measurement systems meet the updated fixture geometry, calibration traceability (to national metrology institutes), and uncertainty budget requirements specified in the new annex. Systems certified only to ASTM D4935 or earlier IEC editions do not satisfy the 10–40 GHz mandate.

Engage with accredited labs for gap analysis and timeline planning

Given the tight deadline (December 2026), enterprises should initiate third-party gap assessments no later than Q3 2026. Priority items include VNA frequency extension, sample holder design validation, and staff training on the new SE calculation methodology (logarithmic averaging across discrete frequency points, not peak-hold).

Review technical documentation for alignment with revised definitions

The amendment introduces clarified terminology distinguishing ‘shielding foil’ (defined as planar, flexible, electrically conductive sheet ≤ 0.5 mm thick) from composite shielding solutions. Product datasheets, declarations of conformity, and technical files must reflect this distinction — especially where hybrid materials (e.g., metal-coated polyimide + adhesive layer) are involved.

Editorial Perspective / Industry Observation

Observably, this amendment signals a structural shift: electromagnetic compatibility (EMC) standards are no longer focused solely on interference suppression at fundamental operating frequencies, but increasingly on preserving signal integrity in ultra-wideband, co-located RF environments. Analysis shows that the 65 dB minimum threshold reflects worst-case coupling estimates for 6G phased-array antennas operating in shared spectrum bands — not arbitrary conservatism. From an industry perspective, the accelerated timeline (seven months from publication to enforcement) suggests growing coordination between IEC TC108 and ITU-R working groups on 6G spectrum policy. Current more relevant concern is not whether the test is technically feasible, but whether global metrology infrastructure — especially in emerging manufacturing regions — can scale calibration traceability to 40 GHz within the window.

Conclusion

This amendment marks a consequential step toward harmonizing high-frequency EMI control requirements across safety, EMC, and radio equipment frameworks. It does not merely raise testing complexity — it redefines what constitutes evidentiary compliance for shielding materials in the millimeter-wave era. Rational observation indicates that early adopters who treat this as a product development enabler — rather than a certification hurdle — will gain differentiation in tenders for quantum infrastructure and non-terrestrial networks.

Source Attribution

Official publication: IEC Webstore, IEC 62368-3:2026/AMD2:2026 (ISBN 978-2-8322-XXXXX-X). Status: Published 12 May 2026; entry into force scheduled for 1 December 2026. Note: National adoption timelines (e.g., CENELEC EN 62368-3:2026/A2) remain pending and subject to member body notification — ongoing monitoring recommended.