Vietnam Enforces New TISI Dual-Certification for PV Mounting Aluminum Profiles

Vietnam’s National Standard and Industrial Institute (TISI) implemented TISI 2255-2567:2026 on May 11, 2026 — a mandatory standard for aluminum structural profiles used in solar photovoltaic (PV) mounting systems. The regulation introduces dual technical requirements: wind load resistance ≥2.5 kPa and neutral salt spray resistance ≥1,000 hours. Exporters of PV-supporting industrial materials from China to Vietnam, as well as local EPC contractors updating tender specifications, must now comply. This development directly affects supply chain actors involved in cross-border trade, manufacturing, and project delivery of solar infrastructure components.

Event Overview

On May 11, 2026, the Vietnam Standards and Industrial Institute (TISI) announced the immediate enforcement of TISI 2255-2567:2026, titled Solar Photovoltaic Mounting Aluminum Structural Profiles. The standard mandates two new performance criteria: minimum wind pressure resistance of 2.5 kPa and minimum neutral salt spray test duration of 1,000 hours. It applies to aluminum profiles intended for PV mounting structures. The requirement is binding for imported products entering Vietnam; non-compliant shipments face rejection or return. Vietnamese EPC general contractors have concurrently updated their technical bidding clauses to reflect this standard.

Industries Affected by the Regulation

Export-oriented trading enterprises

Companies exporting aluminum profiles for PV mounting from China to Vietnam are directly subject to the regulation. Non-certified consignments risk customs rejection or forced return after arrival, increasing logistics cost and delivery uncertainty. Compliance verification must occur prior to shipment — not upon entry.

Aluminum profile manufacturers and fabricators

Producers supplying PV mounting components must verify whether their current product lines meet both mechanical (wind load) and corrosion-resistance (salt spray) benchmarks. Process validation, material selection, surface treatment (e.g., anodizing or coating), and third-party testing capacity may require review or adjustment.

EPC contractors and system integrators in Vietnam

Local EPC firms now incorporate TISI 2255-2567:2026 into tender documents and procurement specifications. Failure to source certified profiles may invalidate bids or trigger contractual non-compliance during project audits or commissioning phases.

Supply chain and certification support providers

Testing laboratories accredited for TISI-compliant wind load and neutral salt spray assessments — particularly those recognized by TISI or mutually accepted under ASEAN MRAs — may experience increased demand. Logistics and customs advisory services must update documentation checklists to include TISI certification evidence.

Key Points for Enterprises and Practitioners to Monitor and Act On

Confirm official TISI recognition pathways for foreign test reports

Analysis shows that TISI does not automatically accept test reports issued outside Vietnam. Exporters should verify whether their existing lab certifications (e.g., ISO/IEC 17025-accredited facilities in China or Thailand) are pre-approved by TISI for this standard — or whether retesting in a TISI-designated lab is required.

Review product specifications against both wind load and salt spray thresholds

Observably, the dual requirement creates interdependent design constraints: achieving 2.5 kPa wind resistance often involves thicker wall sections or reinforced geometry, which may affect weight, extrusion feasibility, or corrosion behavior under salt exposure. Manufacturers should assess whether current alloy grades (e.g., 6063-T5, 6061-T6) and surface treatments remain sufficient across both tests.

Align with Vietnamese EPC technical procurement timelines

From the industry perspective, EPC firms began updating tender terms ahead of the May 11 enforcement date. Suppliers should examine recently issued RFPs and contract annexes for explicit references to TISI 2255-2567:2026 — including required documentation formats (e.g., test report language, certificate validity period, traceability of batch numbers).

Prepare documentation and labeling for customs clearance

Current more practical preparation includes compiling certified test reports, TISI-conformity declarations (if applicable), and clear product marking indicating compliance. Customs brokers in Vietnam increasingly request these documents proactively — even before physical inspection — to avoid delays at Ho Chi Minh City or Hai Phong ports.

Editorial Observation / Industry Perspective

This regulation is better understood as a formalized market access signal rather than an isolated technical update. Analysis shows it reflects Vietnam’s broader shift toward tightening quality governance for renewable energy infrastructure components — especially in coastal and typhoon-prone regions where wind and corrosion risks are elevated. Observably, the inclusion of both mechanical and environmental durability metrics suggests growing emphasis on long-term system reliability over initial cost. From the industry perspective, this standard may serve as a precedent for future requirements on other PV balance-of-system (BOS) materials, such as bolts, clamps, or grounding components. Continuous monitoring of TISI’s published interpretations or amendments remains essential, as implementation guidance (e.g., sampling rules, test frequency, transitional arrangements) has not yet been publicly released.

In summary, TISI 2255-2567:2026 marks a step toward harmonized technical gatekeeping for PV mounting hardware in Vietnam. Its significance lies less in novelty and more in enforceability: it transforms previously voluntary or project-specific durability expectations into a nationwide import barrier. For affected stakeholders, the regulation is best interpreted not as a one-time compliance checkpoint, but as an indicator of escalating technical due diligence in Southeast Asian solar markets — where certification readiness increasingly determines commercial eligibility.

Source: Vietnam Standards and Industrial Institute (TISI), official announcement dated May 11, 2026; confirmed through publicly available tender updates from major Vietnamese EPC contractors (as of May 2026).
Note: Implementation details such as conformity assessment procedures, list of authorized testing labs, and transitional provisions remain pending official publication and are subject to ongoing observation.