U.S. Finds Chinese Fiberglass Door Panels Are Being Sold Below Fair Value

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On January 22, 2026, the U.S. Department of Commerce made a preliminary finding in its investigation of fiberglass door panels from China.

The Commerce Department ruled that fiberglass door panels from the People’s Republic of China are being sold in the U.S. at less than fair value.

The investigation covers the period from July 1, 2024, through December 31, 2024.

This decision was made under Section 733(b) of the Tariff Act of 1930.

The initial investigation was announced on April 15, 2025.

The preliminary determination was delayed by 50 days on August 12, 2025.

Due to a government shutdown and a tolling adjustment, the deadline for the preliminary decision was moved to December 23, 2025.

The fibreglass panels under investigation include door panels and sidelights made with fiberglass skins. These may be finished or unfinished, with or without frames and glass inserts.

These panels may be part of larger entry door systems. All such panels made in China are covered whether processed in another country or not.

The products are classified under U.S. Harmonized Tariff Schedule code 3925.20.0010. They may also fall under other codes such as 4418.29.4000; 4418.29.8030; 4418.29.8060; and 7019.90.5150.

Some types of products are excluded. For example, goods already covered under the antidumping duty orders on wood mouldings and float glass from China are not part of this new investigation.

Commerce used a separate rate for certain companies that qualified. Two firms were individually examined: Dalian Capstone Engineering Co., Ltd., and Jiangxi Fangda Tech Co., Ltd.

Dalian Capstone Engineering Co., Ltd. was assigned a dumping margin of 38.78%. After adjusting for subsidies, the cash deposit rate is 38.75%.

Jiangxi Fangda Tech Co., Ltd. and two related firms — Jiangxi Hangda Tech Co., Ltd. and Jiangxi Onda Tech Co., Ltd. — received a margin of 99.49%, with a cash deposit rate of 99.40%.

A “China-wide” entity received a dumping margin of 147.85%. This rate was based on facts available and adverse assumptions due to lack of cooperation.

Certain producers not individually examined but eligible for separate treatment received a dumping margin of 68.93%. Their adjusted cash deposit rate is 68.87%.

These companies are:

• Anhui Xinyu Fiberglass Door Co., Ltd.
• Wuxi Lutong Fiberglass Doors Co., Ltd. (when exported by East Grace Corporation)
• Wuxi Lutong Fiberglass Doors Co., Ltd. (when exported by Wuxi Xinli New Material Co., Ltd.)

Commerce will send instructions to U.S. Customs and Border Protection to suspend liquidation of subject goods entered on or after January 22, 2026.

Importers must post cash deposits equal to rates listed in the determination chart.

If the related subsidy investigation ends before this one, importers may need to post higher cash deposits for the remainder of this proceeding.

Commerce will conduct a verification of the data used in this case.

Interested parties may file case briefs. These are due seven days after the last verification report is released.

Rebuttal briefs are allowed within five days after case briefs are submitted.

Each brief must include a table of contents, a table of legal authorities, and an executive summary with footnotes.

A hearing may be held, if requested, on issues raised in the briefs.

Dalian Capstone requested a delay of the final determination and an extension of provisional measures.

Commerce granted this request.

Now, the final determination will be due no later than 135 days from the publication of this preliminary finding.

The U.S. International Trade Commission has also been notified.

If the final determination is affirmative, the Commission will determine whether these imports injured or threaten to injure the domestic industry.

This decision was signed by Christopher Abbott, Deputy Assistant Secretary for Policy and Negotiations on December 23, 2025.

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