SASO Proposes T6d Explosion Protection for Industrial Magnetrons

RIYADH, May 15, 2026 — The Saudi Standards, Metrology and Quality Organization (SASO) has issued a public consultation on the draft standard SASO IEC 60079-28:2026, titled Explosive Atmospheres — Part 28: Protection of Equipment by Optical Radiation, specifically addressing industrial microwave sources. Effective from the proposed adoption date, the revision would extend the applicable temperature class for industrial magnetrons from T4 to T6d (maximum surface temperature ≤85°C) and introduce a new mandatory requirement for transient microwave leakage suppression (≤10 mW/cm² sustained for ≤100 ms). This update directly impacts manufacturers and exporters supplying magnetron-based equipment to Saudi Arabia’s industrial heating and plasma processing sectors.

Event Overview

On May 15, 2026, SASO published the draft SASO IEC 60079-28:2026 for stakeholder comment. The draft amends the scope to explicitly cover industrial magnetrons used in non-consumer applications, upgrades the temperature classification requirement from T4 to T6d, and adds a time-gated microwave leakage limit of ≤10 mW/cm² over a 100-ms window. The consultation period remains open until August 14, 2026. If adopted as drafted, the standard is expected to enter into force six months after final approval, with enforcement likely beginning Q1 2027.

Industries Affected

Direct Exporters & Trading Firms: Companies exporting industrial microwave ovens, plasma etching systems, or vacuum drying equipment to Saudi Arabia must ensure magnetron-level compliance—not just system-level certification. Non-compliant units risk customs rejection or post-import audit penalties. Certification timelines may extend due to additional thermal validation and pulsed-leakage testing, potentially delaying shipment schedules and increasing conformity assessment costs by 15–25%.

Raw Material & Component Suppliers: Suppliers of ceramic insulators, copper anodes, and vacuum envelope materials face revised thermal stress specifications. T6d compliance demands higher-grade thermal interface materials and tighter dimensional tolerances for heat-sink interfaces. Demand for low-outgassing, high-thermal-conductivity ceramics is expected to rise, particularly among vendors certified to ISO 9001 and IATF 16949.

Equipment Manufacturers & OEMs: Firms integrating magnetrons into industrial heating systems (e.g., rubber vulcanization, food pasteurization lines) or plasma reactors must redesign magnetic shielding, cooling ducts, and cavity coupling geometry. Thermal simulation (e.g., ANSYS Icepak) and pulsed RF emission testing will become mandatory pre-certification steps. Legacy T4-rated magnetrons cannot be grandfathered; retrofitting existing models is technically unfeasible per the draft’s scope.

Supply Chain Service Providers: Third-party test labs and certification bodies accredited by SASO (e.g., SGS, Bureau Veritas, Intertek) will need to validate new test protocols for transient leakage measurement and extended surface temperature mapping under dynamic load cycling. Capacity constraints are anticipated during Q3–Q4 2026 as labs upgrade pulse RF detectors and thermal imaging rigs calibrated to ±0.5°C accuracy.

Key Focus Areas and Recommended Actions

Verify magnetron datasheets against T6d thermal boundary conditions

Manufacturers should request full thermal derating curves (not just ambient ratings) and confirm surface temperature measurements are conducted per IEC 60079-0 Annex E—using black-body emissivity correction and contactless IR thermography at operational duty cycles (e.g., 10 s ON / 30 s OFF).

Assess shielding integrity for transient microwave leakage

Conduct time-domain leakage scans using broadband RF probes (300 MHz–6 GHz) with ≥10 ns rise-time response. Pay particular attention to waveguide flange joints, cathode feedthroughs, and cooling fin gaps—common failure points under pulsed operation.

Engage early with SASO-accredited conformity assessment bodies

Initiate pre-submission technical reviews before formal application. Labs report that 70% of initial submissions under similar drafts fail on incomplete thermal documentation or uncalibrated leakage measurement setups—delays average 8–12 weeks.

Editorial Perspective / Industry Observation

Observably, this draft reflects SASO’s broader strategic shift toward harmonizing with IECEx and ATEX thermal rigor—not merely adopting international standards verbatim, but tightening enforcement thresholds where local industrial hazards (e.g., high ambient temperatures, dust-laden process environments) demand stricter margins. Analysis shows the T6d extension is less about incremental safety and more about enabling next-generation high-power density magnetrons (≥5 kW) in compact plasma reactors. From an industry standpoint, the 100-ms leakage clause signals growing regulatory attention to *transient* electromagnetic hazards—a domain previously governed only by steady-state limits. Current more critical than compliance timing is the need for cross-functional alignment between RF design, thermal engineering, and regulatory affairs teams within affected firms.

Conclusion

This proposal marks a material escalation in technical expectations for magnetron-based industrial equipment entering Saudi markets. It is not merely a certification update but a functional redefinition of thermal and electromagnetic performance boundaries. For global suppliers, successful adaptation hinges less on reactive testing and more on proactive co-design with component partners—and treating T6d not as a label, but as a system-level thermal architecture principle.

Source Attribution

Official draft notice: SASO Public Consultation Portal, Document No. SASO/IEC/60079-28/2026/DFT/EN (published May 15, 2026). Full text accessible via https://www.saso.gov.sa/en/standards/consultations. Note: Final text, effective date, and transition provisions remain subject to change pending consultation outcomes; stakeholders are advised to monitor SASO’s official updates through Q3 2026.