EU Guidance Tightens Potting Compound Requirements

On July 1, 2026, CENELEC issued application guidance for EN IEC 62368-3:2026 that clarifies a stricter compliance condition for potting compounds used in power module encapsulation for audio-video and IT equipment: the material must meet both UL 94 V-0 flame rating and a CTI of at least 600V. Because the guidance took effect immediately, the change deserves attention not only from manufacturers and exporters, but also from procurement, certification, and delivery teams handling shipments to the European market.

What the new guidance explicitly requires

According to the information provided, the application guidance released by CENELEC on July 1, 2026 under EN IEC 62368-3:2026 states that potting compounds used for encapsulating power modules in audio-video and IT equipment must satisfy two conditions at the same time: UL 94 V-0 and CTI greater than or equal to 600V. The rule is effective immediately. The change affects deliveries by Chinese potting compound exporters to Europe, and some small and medium-sized suppliers are facing pressure to close certification gaps.

Where the pressure is likely to appear first

Export deliveries tied to existing material approvals

From an industry perspective, exporters are likely to feel the impact first where current product files, test evidence, or customer approvals do not yet show both indicators together. The immediate issue is not only product suitability, but whether shipments can continue to align with the clarified requirement in documentation and customer review.

Procurement decisions around material substitution

For procurement teams sourcing potting compounds for power modules, the rule change may affect supplier screening and material selection. Analysis shows that buyers will need to pay closer attention to whether candidate materials can demonstrate both UL 94 V-0 and CTI greater than or equal to 600V, rather than relying on a single compliance attribute when making purchase and qualification decisions.

Certification and testing workflows

Certification-related businesses and testing service providers may see increased demand for document checks, evidence updates, and gap assessment. What deserves closer attention is whether existing reports, technical files, and supporting compliance materials are sufficient for customer review and delivery acceptance under the new guidance.

Delivery coordination across the supply chain

Supply chain service teams, including those coordinating export schedules and customer handover, may need to watch for changes in document requests, shipment readiness reviews, and acceptance conditions. Observably, where a supplier has not yet completed the required compliance alignment, delivery timing could come under pressure.

What companies should review now

Check whether both requirements are evidenced together

Analysis shows that companies should first review whether the potting compounds used in relevant power module applications are supported by materials and reports showing both UL 94 V-0 and CTI greater than or equal to 600V. Where one side of the requirement is missing, that gap may become a direct issue for exports and customer acceptance.

Re-examine technical files and trade documents

What deserves closer attention is the consistency between technical documents, test reports, product declarations, and customer-facing compliance files. Even where materials are believed to be suitable, incomplete or inconsistent documentation may create friction in procurement review, certification checks, or delivery clearance.

Watch customer specifications and tender language

Because the input does not provide detailed enforcement procedures, it would be premature to describe a settled market practice. Even so, companies should monitor whether buyers, project specifications, or tender documents begin to reflect the dual requirement more explicitly in qualification language and delivery conditions.

Assess supplier readiness and delivery risk

For firms relying on external material suppliers, supplier readiness now becomes a practical compliance topic. Analysis shows that businesses should pay attention to whether upstream partners can provide current supporting evidence in time for order execution, especially where shipments to Europe are time-sensitive.

How this change is best understood at this stage

Observably, this update is better understood as an already effective compliance signal rather than a distant policy direction, because the guidance is described as taking effect immediately. At the same time, it is not yet possible, based on the provided information alone, to state a uniform enforcement outcome across all transactions or customers. From an industry perspective, the more important point is that the rule clarification may quickly move from a technical standard issue into a procurement and delivery issue wherever evidence is incomplete.

Why the market will keep watching this issue

The immediate significance of this development lies in its practical effect on compliance alignment for exports to Europe. It is more appropriate to understand this as a rule change with near-term operational consequences, especially for companies that still need to fill certification or documentation gaps. A measured reading is warranted: the requirement itself is clear in the provided information, but the exact pace of downstream implementation still needs observation through certification practice, buyer requirements, and delivery-side feedback.

Basis of this article

This article is generated from the user-provided news title, event date, and event summary. For developments of this kind, relevant source categories typically include official notices, regulator publications, trade authority information, industry association releases, standards organization documents, and reporting by authoritative media. A specific official source link was not provided in the input, so the exact original publication path still requires follow-up verification. Further observation is also needed on implementation details, certification interpretation, changes in tender documents, market feedback, and how companies carry out compliance alignment in practice.