Aluminum Curtain Wall from China: Test Methods and Product Standards for Buyers

Not legal or engineering advice. This guide lists the public test methods, product standards and US duty scope that come up when buying aluminum curtain wall systems made in China. Each statement links to the page it comes from. Confirm project requirements with your facade engineer, code official and customs broker.

It does not name or rank manufacturers and does not quote prices, minimum orders or lead times; ask each supplier for those in writing.

ASTM E283/E283M is a laboratory procedure for determining the air leakage rates of exterior windows, skylights, curtain walls and doors under specified differential pressure conditions across the specimen. Source: ASTM E283/E283M-19, Scope and Significance and Use.

ASTM notes that air leakage rates may not be valid for comparison unless the components tested are of essentially the same size, configuration and design. Source: ASTM E283/E283M-19, Scope and Significance and Use.

ASTM E331 determines the resistance of exterior windows, curtain walls, skylights and doors to water penetration under a uniform static air pressure difference, and is applicable to any curtain-wall area. Source: ASTM E331-00(2023), Scope and Significance and Use.

ASTM E330/E330M determines structural performance under uniform static air pressure differences, typically representing wind load, and is applicable to curtain wall assemblies including metal, glass, masonry and stone components. Source: ASTM E330/E330M-14(2021), Scope and Significance and Use.

ASTM E330 evaluates only the tested specimen, not the structural performance of adjacent construction. Source: ASTM E330/E330M-14(2021), Scope and Significance and Use.

NFPA 285 provides a test method for determining the fire propagation characteristics of exterior wall assemblies and of panels used as components of curtain wall assemblies that are built with combustible materials or incorporate combustible components; NFPA lists its current edition as 2025. Source: NFPA 285 document page (NFPA).

Ask for the report that matches the exact panel and wall build-up in your project, where your code requires it.

EN 13830:2015+A1:2020 "Curtain walling – Product standard" was published by CEN in May 2020, includes Amendment 1 approved on 7 October 2019, and supersedes EN 13830:2015. Source: EN 13830:2015+A1:2020, front matter and contents (CEN text, preview).

Its listed product characteristics include reaction to fire, fire resistance, fire propagation, watertightness, wind load resistance, impact resistance, seismic resistance, thermal transmittance, air permeability and durability. Source: EN 13830:2015+A1:2020, front matter and contents (CEN text, preview).

GB/T 21086-2007 "Curtain wall for building" was published on 2007-09-11, has been in force since 2008-02-01 and is listed as current. Source: GB/T 21086-2007 record, National Public Service Platform for Standards Information.

Its last periodic review, on 2023-12-28, concluded that it should be revised, and a revision project is listed as pending approval. Source: GB/T 21086-2007 status record, National Public Service Platform for Standards Information.

It covers terms, classification, marking, general and specific requirements, test methods, inspection rules, marking, packing, transport and storage of building curtain walls. Source: GB/T 21086-2007 scope, National Library of Standards.

It applies to stick-built, unitized and double-skin curtain walls faced with glass, stone, metal panels or man-made boards, and to all-glass and point-supported glass curtain walls; it does not apply to concrete panel curtain walls. Source: GB/T 21086-2007 scope, National Library of Standards.

If a supplier quotes GB/T 21086, ask separately for any ASTM, NFPA or EN results your market requires.

The US countervailing duty notice on aluminum extrusions from China includes in scope extrusions described at import as parts for products assembled after importation, such as window frames, door frames, solar panels, curtain walls or furniture. Source: Federal Register 91 FR 51662, FR Doc. 2026-16362 (Aug. 11, 2026), case C-570-968.

Extrusions that are finished (for example anodized, liquid painted or powder coated) or fabricated stay inside the scope. Source: Federal Register 91 FR 51662, FR Doc. 2026-16362 (Aug. 11, 2026), case C-570-968.

The notice states that the written description of the scope is dispositive, not the HTSUS number. Source: Federal Register 91 FR 51662, FR Doc. 2026-16362 (Aug. 11, 2026), case C-570-968.

For rates and reviews see the anti-dumping guide, and confirm classification with your customs broker before you order.

These steps follow from the sources above.

1. Write the test methods and product standards (with editions) your market requires into the purchase specification.
2. Ask for test reports for a specimen that matches your system's size, configuration and design.
3. Ask for fire reports (for example NFPA 285) that match your exact panel and wall build-up, where required.
4. If the supplier quotes GB/T 21086-2007, treat it as the Chinese standard and ask separately for the reports your market requires.
5. Confirm the US duty scope for curtain wall parts with your customs broker.
6. Check the factory's registration with the factory check tool and model duties with the landed-cost calculator.

Which ASTM test covers water penetration of a curtain wall? ASTM E331, which is applicable to any curtain-wall area. Source: ASTM E331-00(2023), Scope and Significance and Use.

Does an ASTM E330 report cover the building's supporting structure? No. ASTM E330 evaluates only the tested specimen, not adjacent construction. Source: ASTM E330/E330M-14(2021), Scope and Significance and Use.

What is the current edition of EN 13830? EN 13830:2015+A1:2020, published in May 2020 and superseding EN 13830:2015. Source: EN 13830:2015+A1:2020, front matter and contents (CEN text, preview).

Is GB/T 21086-2007 still current? It is listed as current, but its 2023 review concluded it should be revised. Source: GB/T 21086-2007 status record, National Public Service Platform for Standards Information.

Are aluminum curtain wall parts from China covered by US duties? Extrusions imported as parts for curtain walls assembled after importation are included in the scope of the US countervailing duty notice. Source: Federal Register 91 FR 51662, FR Doc. 2026-16362 (Aug. 11, 2026), case C-570-968.