U.S. Amends Preliminary Dumping Determination on Monomers and Oligomers from Korea

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On February 6, 2026, the U.S. Department of Commerce (Commerce) published an amended preliminary determination in its less-than-fair-value (LTFV) investigation of certain monomers and oligomers from the Republic of Korea.

This amendment corrects significant ministerial errors made in Commerce’s original preliminary determination published on January 5, 2026.

Commerce found that it made significant unintentional errors in calculating dumping margins for a mandatory respondent, Miwon Specialty Chemical Co., Ltd. (Miwon).

These errors were identified in a timely ministerial error allegation filed by the petitioner, Arkema Inc., on January 5, 2026.

Ministerial errors are defined under section 735(e) of the Tariff Act of 1930 and 19 CFR 351.224(f) as errors involving arithmetic mistakes, clerical errors, or similar unintentional mistakes.

Significant ministerial errors, when corrected, must result in a change of at least five absolute percentage points and not less than a 25 percent shift in the weighted-average dumping margin. Alternatively, significance may be found if the corrected margin moves from zero or de minimis to more than de minimis.

Because Miwon’s margin was used to calculate the “all others” rate, both rates were corrected.

The revised weighted-average dumping margins are:

  • Miwon Specialty Chemical Co., Ltd.: 25.07%
  • All Others: 28.52%

Rates for Green Chemical Co., Ltd., Green Life Science, and Kukdo Chemicals Co. Ltd. remain unchanged.

Commerce will disclose its revised calculations within five days to interested parties under 19 CFR 351.224(b).

The new cash deposit rates and suspension of liquidation apply from the date of publication in the Federal Register, February 6, 2026.

These measures will stay in effect until further notice.

Commerce will also notify the U.S. International Trade Commission of this amended determination.

Scope of the investigation covers certain multifunctional acrylate and methacrylate monomers, and acrylated bisphenol-A epoxy based oligomers from Korea.

These include products such as:

  • Triethylene glycol dimethacrylate (CAS 109-16-0)
  • 1,6-hexanediol diacrylate (CAS 13048-33-4)
  • Tripropylene glycol diacrylate (CAS 42978-66-5)
  • Trimethylolpropane trimethacrylate (CAS 3290-92-4)
  • Trimethylolpropane triacrylate (CAS 15625-89-5)
  • Ethoxylated trimethylol-propane triacrylate (CAS 28961-43-5)
  • Dipropylene glycol diacrylate (CAS 57472-68-1)
  • Bisphenol-A-epichlorohydrin copolymer acrylate (CAS 55818-57-0)

These products are typically used in inks, coatings, adhesives, and other resin applications.

Included are blends or mixtures with at least 20% by weight of in-scope products.

The scope also covers products processed in third countries that do not change the essential nature of the product.

Excluded from the scope are cured downstream products such as inks, varnishes, or coatings applied for final use.

The affected products are currently classifiable under HTSUS codes including but not limited to:

  • 2916.12.5050
  • 2916.14.2050
  • 3824.99.2900
  • 3907.29.0000
  • 3907.30.0000

Some products may also be entered under:

  • 2916.12.1000
  • 3824.99.9397

Only the written scope description governs determination of coverage.

The amended preliminary determination was signed by Christopher Abbott, Deputy Assistant Secretary for Policy and Negotiations, on January 30, 2026.

Reference document: Federal Register Vol. 91, No. 25, FR Doc No: 2026-02429.


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