Effective June 1, 2026, the EU will implement the coordinated enforcement of the RoHS III and REACH amendments in the customs clearance process for temperature sensing products. When exporting related products containing electronic components and NTC thermistors, it is necessary to simultaneously submit a Full Material Declaration compliant with EN 62474. In the first week after the new regulation took effect, exporters in Shenzhen and Dongguan had already reported port detention inspections at the Port of Rotterdam, with average customs clearance delays of 3 to 5 working days. The reason this change deserves continued industry attention is that it affects not only a single customs declaration procedure, but also BOM compliance approval, delivery scheduling, and supply chain document preparation in end-use projects such as energy storage, automotive electronics, and industrial temperature control.

First-week feedback shows that customs clearance document requirements have entered the enforcement stage

Confirmed information shows that, effective June 1, 2026, the EU has officially implemented coordinated supervision of the RoHS III and REACH amendments. Under this requirement, all temperature sensing products containing electronic components, including NTC thermistors, must submit a Full Material Declaration (FMD) compliant with EN 62474 during customs clearance.

At the enforcement level, multiple exporters in Shenzhen and Dongguan reported that their related goods encountered port detention inspections at the Port of Rotterdam in the Netherlands, with average customs clearance delays of 3 to 5 working days. The known impact also directly extends to BOM compliance approval for overseas end customers in energy storage, automotive electronics, and industrial temperature control.

From customs declaration to BOM approval, the impact goes beyond a single export procedure

Direct exporters are the first to face pressure to complete documentation

For direct trading companies and export manufacturers, the most immediate impact of this change is reflected in customs clearance documentation preparation. Shipment processes that previously focused on product functions, standard compliance documents, and existing technical materials must now additionally address whether a Full Material Declaration compliant with EN 62474 can be provided simultaneously. If document preparation is incomplete, the first impact will fall on customs declaration, release, and delivery scheduling.

Manufacturing and procurement need to return to the material level to verify information

For processing manufacturers, raw material procurement companies, and teams responsible for component selection, the impact is not limited to customs clearance. Because the requirement is directly tied to the Full Material Declaration and BOM compliance approval, companies need to pay attention not only to whether finished products can be shipped, but also to whether material-level information on NTC thermistors and related electronic components can be fully traced, organized, and used for external submission. This means coordination among procurement, R&D, quality, and compliance will become even more important.

Downstream customers and channel partners will pay more attention to delivery certainty

For overseas buyers, channel distribution companies, and project executors in fields such as energy storage, automotive electronics, and industrial temperature control, what currently deserves more attention is the linkage between delivery and approval. Once Full Material Declaration preparation is insufficient, the impact may not be limited to a delay of a single shipment, but may also affect the scheduling of end customers’ reviews of BOM compliance materials, thereby influencing order confirmation, project transition, or supplier release schedules.

Testing and compliance service-related parties may take on more pre-shipment review demands

For certification-related companies, testing service institutions, and supply chain service providers, analysis suggests that companies are more likely to shift their focus forward to pre-shipment document verification, technical documentation organization, and compliance review support. This change at least sends a clear signal: compliance documents related to temperature sensing products are shifting from “supplementary documents” to “prerequisite documents affecting customs clearance and approval.”

Which practical changes deserve closer attention at present

First confirm whether FMD has been incorporated into the existing shipment documentation system

What companies currently need to prioritize is not broad regulatory wording, but whether the existing shipment documentation already covers a Full Material Declaration compliant with EN 62474. If it has not yet been incorporated, problems such as supplementary document submission, customs clearance waiting, or customer follow-up requests for documentation may continue to arise in subsequent export arrangements.

Focus on the material transparency of NTC and related temperature sensing products

From a practical perspective, NTC thermistors and temperature sensing products containing electronic components should become the primary categories for internal review by companies. Especially under multi-tier supply chain conditions, companies need to pay attention to whether upstream suppliers can steadily provide BOM-corresponding material information, and whether these materials can support consistent external submission.

Delivery planning and customer communication schedules need buffer time

The reported customs clearance delays of 3 to 5 working days indicate that companies should be more cautious in production scheduling, shipment, and delivery commitments for overseas customers. In the short term, what deserves more attention is whether additional buffer time needs to be built into project delivery cycles, and whether customers may further raise their review requirements for the completeness of compliance documents.

Continue monitoring whether enforcement practices and customer document requirements become more detailed

Since the input information does not provide more detailed official enforcement guidance, companies should not currently regard all operational details as already fully stabilized. A more prudent approach is to continue monitoring whether specific requirements regarding Full Material Declarations, BOM compliance, and document formats become further clarified in customs clearance, customer audits, tender documents, and supplier approval documents.

This is more like an enforcement signal rather than just a regulatory text update

From an industry perspective, this information is currently better understood as a sign that the rules have already begun to show impact at the trade execution level, rather than remaining only a change at the regulatory text level. The reason is that port detention inspections and customs clearance delay reports appeared in the first week, indicating that the relevant requirements have already begun to affect actual shipment processes.

At the same time, observation suggests that this change still cannot be simply understood as meaning that all enforcement details have been fully finalized. At this stage, the industry still needs to continue paying attention to subsequent official wording, customer audit standards, the difficulty of supply chain document preparation, and implementation differences across different business scenarios. For companies, the real risk lies not only in “whether they know there is a new regulation,” but in whether they can promptly translate document requirements into executable internal processes.

At this stage, it should be regarded more as a clear signal of earlier-stage compliance requirements

Overall, the core message conveyed by this event is that the export business of temperature sensing products, especially those involving NTC thermistors, is facing more front-loaded and more detailed compliance document requirements. Its significance for the industry is not in creating a new market conclusion, but in reminding companies to reexamine the connection among material information preparation, the completeness of customs clearance documents, and customer BOM approval.

Therefore, it is currently more appropriate to understand this information as an enforcement signal that has already taken effect, while also recognizing it as a regulatory change that requires continued observation of subsequent detailed rules, enforcement standards, and market feedback. For relevant companies, the near-term priority is not to overinterpret it, but to verify as soon as possible whether products, materials, documents, and delivery processes can match the new customs clearance requirements.

Basis of this article and directions for subsequent verification

This article is generated based on the information title, event occurrence time, and event summary provided by the user. The information used includes only: the start of the implementation of relevant coordinated EU supervision on June 1, 2026, the requirement that temperature sensing products submit a Full Material Declaration compliant with EN 62474 for customs clearance, the port detention inspections encountered by some exporters in Shenzhen and Dongguan at the Port of Rotterdam and the resulting delays of 3 to 5 working days, as well as the direct impact of this change on BOM compliance approval in fields such as energy storage, automotive electronics, and industrial temperature control.

For this type of event, subsequent verification usually still needs to be continuously combined with official announcements, releases by regulatory authorities, information from customs or trade authorities, industry association information, documents from standards organizations, and authoritative media reports. Since the input does not provide specific links to official sources, the relevant official links and more detailed enforcement basis still need to be confirmed continuously afterward. Content worth continued observation includes: whether policy details are supplemented, whether certification or customs clearance enforcement standards are further refined, whether customer tender and approval documents are adjusted accordingly, whether industry feedback continues to expand, and how companies adapt in actual implementation.