A-580-921: antidumping duty order on Monomers and Oligomers from South Korea
A-580-921 is the US Department of Commerce case number for the antidumping duty order on Monomers and Oligomers from South Korea, in force since 28 July 2026. Goods in scope entered under this case carry an antidumping cash deposit at entry on top of the normal duty.
Reviewed September 2026 against the ITA order list and the Federal Register.
Case numberA-580-921Antidumping duty (AD), market economy
ProductMonomers and Oligomers ITA commodity group: Chemicals and Allied Industries
Next sunset reviewJune 2031 month Commerce is due to initiate the five-year review
Rates in the order notice
65.72%All-others weighted-average dumping margin
As printed in the order notice (91 FR 47214, 28 July 2026). The deposit an entry pays today is the rate assigned to the exporter or producer on the invoice in the latest administrative review, which can be higher or lower than this; a company that has never been reviewed keeps the all-others rate. Check the current rate for your supplier in Commerce's ACCESS case record before pricing an order.
HTS numbers named in the scope
The subheadings the notice lists as the ones subject merchandise may enter under. They are given for convenience; the written scope is what decides whether goods are covered, and goods under other numbers can still be in scope.
scope of the investigations if performed in the
subject country.
The scope also includes CMOs that are commingled, mixed or
blended with in-scope product from sources not subject to these
investigations.
Only the subject component(s) of such blends, mixtures or
commingled products described above is covered by the scope of these
investigations. Subject merchandise contained in a blended, mixed or
commingled product described above will not have undergone a
chemical reaction as a result of being blended, mixed or commingled.
Notwithstanding the above, specifically excluded from the scope
are downstream products, including but not limited to, inks,
coatings and overprint varnishes. For purposes of this exclusion,
the downstream product requires only the application of energy to be
cured, e.g., inks or varnish applied to packaging, coatings applied
to wood flooring, etc. The energy source required to cure the
downstream product to its substrate can be thermal, ultraviolet
radiation, visible light, electron beam radiation, or infrared
radiation.
This merchandise is currently classifiable under Harmonized
Tariff Schedule of the United States (HTSUS) subheadings
2916.12.5050, 2916.14.2050, 3824.99.2900, 3907.29.0000 and
3907.30.0000. Subject merchandise may also be entered under
subheadings 2916.12.1000 and 3824.99.9397. …
Excerpt from 91 FR 47214. Scopes are amended by later scope rulings and circumvention findings; the notice list below has them.
What A-580-921 means when you import
Cash deposit at entry. For every entry of goods in scope, CBP collects an estimated antidumping duty cash deposit at the rate assigned to the exporter or producer on the entry, on top of the Column 1 duty and any Chapter 99 trade-remedy lines. The same product from two plants in South Korea can deposit at different rates, so ask the supplier which legal entity will appear as exporter and as producer on the invoice before you price the order.
Deposit now, final duty later. The deposit is not the final duty. The entry stays unliquidated until Commerce completes the administrative review for the period it was entered in, then CBP liquidates it at the rate that review sets, and bills or refunds the difference with interest. AD/CVD entries therefore stay open for years, and the importer of record carries the difference. Commerce must be asked for a review each anniversary month of the order; if nobody asks, entries liquidate at the deposit rate.
Reimbursement certificate. Before liquidation the importer files a certificate under 19 CFR 351.402(f)(2) stating whether the exporter has paid or reimbursed the antidumping duty. If it is not filed, Commerce may presume reimbursement and deduct the duty a second time in the margin calculation. Brokers file it with the entry summary; make sure yours does.
Entry reporting. The AD/CVD case number goes on the 7501 line alongside the HTS number, and any Chapter 99 lines the goods carry are reported in the order CBP prescribes; the tariff updates tracker carries the current Chapter 99 sequence and the actions behind it. Goods finished, cut or packaged in a third country stay in scope if the notice's written scope covers them, so a change of shipping origin is not a change of AD/CVD origin.
Estimating the stack. The tariff simulator returns the Column 1 rate and the Chapter 99 additional duties for an HTS number and origin; it does not add antidumping or countervailing deposits. Add the deposit at your supplier's current rate on top of what it shows. Airlift USA does not hold a US customs broker licence; entries on cargo we move are filed through our licensed broker network.
Case list: AD/CVD Orders and Suspension Agreements, International Trade Administration, Enforcement and Compliance — ITA dashboard, export of September 2026. Notices, rates and HTS numbers: Federal Register API v1. Both are US Government works in the public domain. This page is a reference, not legal or customs advice.
Importing monomers and oligomers from South Korea under A-580-921?
Tell us the product, the exporter and producer named on the invoice, the load port, the US delivery point and the ready date. We come back with the ocean freight, the destination charges and how the entry is filed through our licensed broker network; the AD/CVD cash deposit itself is set by the rate on the entry, not by us.