IEC 62368-3:2026 Amd 2 Adds 10–40 GHz SE Testing for Shielding Foils

On 14 May 2026, the International Electrotechnical Commission (IEC) published Amendment 2 to IEC 62368-3:2026, introducing standardized shielding effectiveness (SE) test methods for shielding foils in the 10 GHz–40 GHz frequency range. This update directly affects manufacturers and exporters supplying components for 5G-Advanced (5G-A), 6G mmWave base stations, and satellite communication terminals — sectors where electromagnetic interference (EMI) mitigation at millimeter-wave frequencies is now formally regulated.

Event Overview

The IEC officially released IEC 62368-3:2026 Amendment 2 on 14 May 2026. The amendment extends the existing SE testing framework for shielding foils by incorporating the ASTM D4935 extended method to cover the 10 GHz–40 GHz band. Global accredited laboratories have confirmed alignment with this revision and updated their testing capabilities accordingly. Exporters based in China are now required to include test reports covering this newly mandated frequency range for relevant product certifications.

Industries Affected by Segment

Direct Exporters of EMI Shielding Components

These enterprises supply shielding foils to overseas OEMs or system integrators in telecom infrastructure and aerospace. They are affected because compliance documentation must now include SE data across 10–40 GHz — a requirement not previously enforced under IEC 62368-3. Impact manifests in revised technical dossiers, extended lead times for certification, and potential requalification of legacy foil grades.

Manufacturers of High-Frequency RF Subassemblies

Companies assembling mmWave front-end modules, antenna-in-package (AiP) units, or satellite terminal housings rely on validated foil performance. The amendment means incoming shielding foil materials must be verified against the new band; failure to do so may delay type approval or trigger non-conformance during third-party audits.

Suppliers of Flexible Printed Circuit (FPC) and Enclosure Materials

Shielding foils are often laminated onto FPCs or integrated into metal-plastic hybrid enclosures. Material suppliers must now ensure traceable SE test reports per the updated standard — particularly when targeting applications in 5G-A small cells or low-earth-orbit (LEO) ground terminals.

Contract Laboratories and Certification Service Providers

Testing labs serving global clients have already upgraded equipment and procedures to deliver compliant 10–40 GHz SE measurements. Their capacity expansion signals growing demand for high-frequency validation — especially from Asia-based clients preparing for EU, US, and Japanese market access.

Key Considerations and Recommended Actions

Monitor official implementation timelines from regional conformity bodies

While the IEC standard is effective upon publication, national adoption (e.g., via CENELEC in Europe or ANSI in the US) may follow with transitional periods. Enterprises should track updates from notified bodies and accreditation authorities — particularly whether legacy test reports remain accepted for products certified before 14 May 2026.

Prioritize testing for products targeting 5G-A infrastructure and LEO satellite terminals

Given that the 10–40 GHz band overlaps critical operational bands for 5G-A (e.g., 26.5–29.5 GHz) and 6G research (e.g., 37–40 GHz), shielding foil validation should be prioritized for these specific end-use applications — rather than applied uniformly across all foil SKUs.

Distinguish between regulatory signal and immediate enforcement

Analysis shows this amendment reflects a formalization of emerging engineering practice, not an abrupt regulatory shift. It codifies measurement approaches already used in R&D labs but now carries normative weight for conformity assessment. Therefore, early adopters gain advantage in audit readiness, while latecomers risk delays in new product launches.

Update internal material specifications and supplier agreements

Procurement teams should revise material data sheets and quality agreements to explicitly reference IEC 62368-3:2026 Amd 2 and require SE test reports covering 10–40 GHz. This applies especially to foil sourced from Tier-2 or Tier-3 material suppliers without in-house high-frequency metrology.

Editorial Perspective / Industry Observation

Observably, this amendment is less a sudden compliance threshold and more a consolidation of technical consensus around millimeter-wave EMI control. It confirms that shielding performance above 10 GHz is no longer optional for high-integration electronics — especially where thermal, mechanical, and electromagnetic constraints converge in compact RF systems. From an industry perspective, the update serves as both a benchmark for material innovation and a signal that future revisions may extend further into sub-THz ranges (e.g., 100 GHz). Current relevance lies in its enforceability: test reports issued after 14 May 2026 for applicable products are expected to reflect the new scope — making it a near-term operational consideration, not just a long-term strategic signal.

Conclusion: The publication of IEC 62368-3:2026 Amendment 2 formalizes high-frequency shielding validation as a baseline requirement for select advanced wireless applications. Its practical impact is concentrated — not universal — and primarily concerns export-oriented manufacturers whose products interface with regulated mmWave systems. It is best understood not as a broad regulatory overhaul, but as a targeted calibration of test expectations aligned with real-world deployment needs in next-generation connectivity infrastructure.

Source Information:
Primary source: International Electrotechnical Commission (IEC), official publication notice for IEC 62368-3:2026 Amendment 2, dated 14 May 2026.
Note: Ongoing observation is recommended regarding national adoptions and transitional arrangements by regional standardization bodies (e.g., CENELEC, ANSI, SAC).