US CBP Adds Structural Epoxy to Pre-Clearance List Effective June 2026

U.S. Customs and Border Protection (CBP) updated its High-Risk Construction Materials Pre-Clearance List on May 5, 2026, adding structural epoxy as a mandatory pre-submission category. Starting June 2026, all import entries of structural epoxy into the U.S. must include a test report verifying compliance with ISO 22242-2:2026 — specifically, shear strength ≥18 MPa after 50 thermal cycles between −40°C and +80°C — issued by an ISO/IEC 17025-accredited laboratory. This requirement directly affects exporters and suppliers in construction materials, adhesives, and infrastructure-related manufacturing sectors, and introduces new lead-time and documentation constraints for cross-border shipments.

Event Overview

On May 5, 2026, U.S. Customs and Border Protection (CBP) published an update to its High-Risk Construction Materials Pre-Clearance List. Structural epoxy is now designated a mandatory pre-clearance item. Effective June 2026, every U.S. import entry for structural epoxy must be accompanied by a test report confirming compliance with ISO 22242-2:2026 — specifically, minimum lap-shear strength of 18 MPa after 50 thermal cycles (−40°C/+80°C). The report must be issued by a laboratory accredited to ISO/IEC 17025. CBP has indicated that this requirement will extend standard customs clearance timelines to 7–10 business days.

Which Subsectors Are Affected

Direct Exporters (U.S.-bound structural epoxy suppliers)

Exporters based in China and other non-U.S. jurisdictions shipping structural epoxy to the United States are directly subject to the new submission rule. Their customs declarations will be held pending verification of the required ISO 22242-2:2026 report. Non-compliance may result in shipment delays, rejections, or requests for retesting — increasing landed cost and eroding delivery reliability.

Raw Material & Component Suppliers

Suppliers providing base resins, hardeners, or fillers used in structural epoxy formulations may face upstream inquiries from downstream formulators. While not directly regulated under this CBP rule, they may need to support traceability and batch-level thermal stability data to enable their customers’ certification efforts — especially if end-product performance hinges on raw material consistency.

Formulators & Contract Manufacturers

Companies blending, packaging, or private-labeling structural epoxy products must now ensure each production lot undergoes full ISO 22242-2:2026 testing prior to U.S. shipment. This adds both time and cost to quality assurance workflows. Batch-level reporting — rather than type certification — appears implied by CBP’s emphasis on per-entry submission, meaning repeated testing may be necessary across production runs.

Logistics & Customs Service Providers

Freight forwarders and customs brokers handling structural epoxy imports will need to verify report validity before filing entries. They must confirm accreditation status of the issuing lab, correct test parameters (cycle count, temperature range, specimen geometry), and alignment between report scope and Harmonized System (HS) code used in the entry. Errors or omissions may trigger CBP queries, delaying release.

What Relevant Enterprises or Practitioners Should Monitor and Do Now

Confirm laboratory accreditation and test protocol alignment

Verify that the chosen ISO/IEC 17025-accredited lab explicitly lists ISO 22242-2:2026 in its scope of accreditation — and that its current test method covers the exact thermal cycling profile (−40°C/+80°C × 50 cycles) and lap-shear strength measurement per Annex B of the standard. Some labs may only offer earlier versions or modified protocols.

Review HS code classification and product scope definitions

Structural epoxy is not defined by CBP via chemical formula but by functional use (e.g., load-bearing bonding in steel, concrete, or façade systems). Exporters should audit whether their products fall under CBP’s working definition — especially hybrid or modified epoxies marketed for both structural and non-structural applications. Misclassification risks invalidating submissions.

Adjust order-to-shipment lead times and inventory planning

Account for minimum 7–10 business days of extended clearance time starting June 2026. Where possible, initiate testing at least 15 days prior to planned shipment date to accommodate lab turnaround, report review, and potential retesting. Consider holding pre-cleared stock in bonded warehouses near U.S. ports to mitigate delivery risk on time-sensitive projects.

Document internal process controls for traceability

Maintain records linking each shipped batch to its corresponding test report — including batch number, manufacturing date, lab report ID, and accreditation certificate reference. CBP may request such linkage during audits. Internal SOPs should formalize how test reports are generated, reviewed, and attached to electronic entry filings (e.g., ACE eManifest).

Editorial Perspective / Industry Observation

Observably, this requirement signals a broader shift toward performance-based, application-specific validation for high-consequence construction chemicals — moving beyond generic compositional checks. Analysis shows CBP is aligning with evolving U.S. building code expectations (e.g., ICC-ES AC308, ASTM E3042) that emphasize durability under thermal stress, particularly for façade anchoring and seismic retrofitting. It is more accurately understood as an enforcement signal than a one-off regulatory change: structural epoxy is the first adhesive category added to the pre-clearance list, but it may presage similar requirements for other high-performance bonding agents. From an industry standpoint, this reflects growing scrutiny of imported construction materials where failure modes involve long-term environmental degradation — not just initial strength.

Consequently, stakeholders should treat this not as an isolated compliance hurdle, but as an early indicator of tightening technical gateways for engineered building products entering U.S. markets. Sustained attention to standards updates (especially ISO 22242 series revisions) and CBP’s quarterly pre-clearance list amendments will be essential.

Conclusion

This CBP update marks a procedural escalation — not a ban or market restriction — but one that recalibrates timing, documentation, and technical accountability for structural epoxy exports to the U.S. It does not reflect new safety concerns per se, but rather institutionalizes verification of real-world durability under thermal cycling, a known aging factor in field installations. Current practice suggests treating it as an operational inflection point: preparation is feasible, but delay carries measurable schedule and cost consequences. It is better understood as a formalization of existing engineering expectations than as a disruptive policy shift.

Information Sources

Main source: U.S. Customs and Border Protection (CBP), High-Risk Construction Materials Pre-Clearance List Update, effective May 5, 2026. Note: CBP has not yet published accompanying guidance documents (e.g., FAQs, lab recognition criteria, or enforcement timeline clarifications); these remain under observation.