On June 1, 2026, the EU RoHS III Directive (2026/1121/EU) will be officially and fully implemented, imposing trace-level control requirements for lead (Pb ≤ 100 ppm) and phthalates on NTC thermistors and integrated temperature and humidity sensors exported to the EU. This adjustment will directly affect exporters to the EU in sectors such as electronic components, automotive electronics, smart home appliances, and industrial sensing, as customs clearance will mandatorily rely on full-scope test reports issued by EU-recognized laboratories, and non-compliant products will be treated as violations.

Event Overview

According to the official bulletin of the European Commission (OJ L 142/2026), the RoHS III Directive (2026/1121/EU) is confirmed to take full effect from June 1, 2026. Based on the existing RoHS II framework, the new regulation adds limit control requirements for lead and phthalates in NTC thermistors and integrated temperature and humidity sensors, clearly specifying that lead content must not exceed 100 ppm. Chinese exporters must hold test reports covering all restricted substances issued by an EU-recognized lab in order to complete EU customs clearance; otherwise, the products will be deemed non-compliant with the directive requirements and handled as violative products.

Which Market Segments Will Be Affected

Direct trading enterprises: Foreign trade companies and ODM/OEM exporters engaged in exporting NTC thermistors and integrated temperature and humidity sensors to the EU will directly face a higher customs compliance threshold. The impact will be reflected in stricter document review, potentially longer customs clearance cycles, increased risk of return shipment or cargo detention, and the need for test reports to cover newly added phthalate items, not just retesting of lead content.

Processing and manufacturing enterprises: Manufacturers focusing on sensor packaging, SMT assembly, and module integration will need to reassess the migration risks of lead and phthalate substances in production processes, solder selection, flux formulations, and housing materials. Companies that continue using lead-containing solder paste or encapsulation adhesives with phthalate plasticizers will face pressure from process modifications and validation cycles.

Raw material procurement enterprises: Suppliers of upstream materials for sensors, such as ceramic substrates, electrode pastes, lead frames, and encapsulation resins, will need to provide downstream customers with material declarations of conformity (DoC) and third-party test evidence meeting the new RoHS III limits. Companies that fail to update material compliance files in time may be removed from approved supplier lists.

Supply chain service enterprises: This includes testing and certification agents, customs declaration service providers, and compliance consulting firms, whose business focus will shift toward “NTC/temperature and humidity sensor-specific RoHS III pre-testing + report integration.” Service capabilities must cover simultaneous testing of the four phthalates (DEHP、BBP、DBP、DIBP) and lead, and laboratory qualifications must be recognized through listing in the EU NANDO database.

What Key Points Should Relevant Enterprises or Practitioners Watch, and How Should They Respond Now

Pay attention to the update pace of supporting official EU technical documents

The directive has now been published, but harmonized standards (such as the revised version of EN IEC 63000) and European Commission guidance documents have not yet been released simultaneously. Analysis shows that in actual enforcement, customs and market surveillance authorities may operate based on transitional interpretation standards, so companies need to continuously track updates to official EU technical documents (such as JRC guidance and EC FAQs) to avoid carrying out internal rectifications solely based on the directive text.

Focus on complete testing coverage for the two product categories: NTC and integrated temperature and humidity sensors

The new regulation clearly identifies the controlled objects as “NTC thermistors” and “integrated temperature and humidity sensors,” rather than all temperature or humidity sensing components in general. Observably, discrete PTCs, thermocouples, and pure humidity sensors (without temperature integration) are not currently included in this newly added scope. Companies should verify whether their export models fall within the product categories explicitly defined by the directive, and ensure that the sample descriptions, structural composition, and declarations in the test reports are consistent, so as to prevent report invalidation caused by classification deviations.

Differentiate the timing windows for compliance determination and supply chain communication

Test reports must be issued by an EU-recognized lab, but most domestic CNAS laboratories have not yet completed the qualification scope expansion for this requirement. From industry perspective, companies should not wait for “one-stop” testing services to mature, but should instead prioritize material screening and process audits, while simultaneously commissioning overseas or Sino-foreign joint venture laboratories already announced by the EU (listed in NANDO) for sample testing, reserving at least 6–8 weeks for the testing cycle and confirming in advance with customers the acceptability of report formats and issuer qualifications.

Establish a rapid response plan for the EU market

After implementation of the new regulation, EU importers may require upstream suppliers to sign updated declarations of conformity (DoC) and attach valid test report numbers and issuance dates. Current more advisable approach is to sort out the BOM lists of existing export models, identify high-risk materials (such as lead-containing glass frits and PVC wires containing phthalates), and formulate a graded rectification plan; for shipped batches that have not yet cleared customs, proactively contact importers to confirm whether supplementary reports will be accepted, so as to reduce port detention costs.

Editor’s View / Industry Observation

This regulation marks a formal escalation in substance restriction enforcement—not merely an extension of existing RoHS II, but a targeted tightening on specific sensor categories. Observably, it signals a broader regulatory shift toward functional component-level control in smart sensing applications, rather than device-level compliance alone. Analysis shows the inclusion of phthalates alongside lead suggests heightened scrutiny on polymer-based packaging and assembly materials, which were previously less emphasized in thermal sensor compliance. From industry perspective, this is less a one-time certification event and more an inflection point requiring sustained material data management and cross-border lab coordination capability.

Conclusion

The lead-free upgrade required by EU RoHS III for NTCs and integrated temperature and humidity sensors is essentially a structural extension of the compliance threshold from “complete device-oriented” to “key functional component-oriented.” At present, it is more appropriate to understand it as an already implemented mandatory market entry requirement rather than a policy signal still awaiting observation. Companies need to incorporate it into routine export compliance management processes, focusing on the suitability of testing capabilities, material traceability, and cross-market document coordination efficiency, rather than treating it merely as a one-time certification task.

Information Source Notes

Main sources: official bulletin of the European Commission (OJ L 142/2026) and the RoHS III Directive text (2026/1121/EU). Items requiring continued observation: progress on the revision of the EN IEC 63000 harmonized standard, specific enforcement rules of customs authorities in EU member states, and updates on newly recognized laboratory listings in the NANDO database.