# Methylene Diphenyl Diisocyanate (MDI) From China; Scheduling of the Final Phase of an Antidumping Duty Investigation
**AGENCY:**
United States International Trade Commission.
**ACTION:**
Notice.
**SUMMARY:**
The Commission hereby gives notice of the scheduling of the final phase of antidumping investigation No. 731-TA-1733 (Final) pursuant to the Tariff Act of 1930 to determine whether an industry in the United States is materially injured or threatened with material injury, or the establishment of an industry in the United States is materially retarded, by reason of imports of methylene diphenyl diisocyanate (“MDI”) from China, provided for in subheadings 2929.10.80 and 3909.31.00 of the Harmonized Tariff Schedule of the United States, preliminarily determined by the Department of Commerce (“Commerce”) to be sold at less-than-fair-value.
**DATES:**
September 16, 2025.
**FOR FURTHER INFORMATION CONTACT:**
Lawrence Jones ((202) 205-3358), Office of Investigations, U.S. International Trade Commission, 500 E Street SW, Washington, DC 20436. Hearing-impaired persons can obtain information on this matter by contacting the Commission's TDD terminal on 202-205-1810. Persons with mobility impairments who will need special assistance in gaining access to the Commission should contact the Office of the Secretary at 202-205-2000. General information concerning the Commission may also be obtained by accessing its internet server ( *https://www.usitc.gov* ). The public record for this investigation may be viewed on the Commission's electronic docket (EDIS) at *https://edis.usitc.gov.*
**SUPPLEMENTARY INFORMATION:**
*Scope.* —For purposes of this investigation, Commerce has defined the subject merchandise as methylene diphenyl diisocyanate (MDI), which is an aromatic polyisocyanate material whose composition includes two or more isocyanate groups ( *i.e.,* functional group containing a nitrogen atom, a carbon atom, and an oxygen atom bonded together (-NCO)) attached to one or more benzene rings ( *i.e.,* flat, symmetrical molecule made up of six carbon atoms arranged in a hexagonal ring and has the chemical formula C6H6) that are joined by methylene bridges ( *i.e.,* a carbon atom bound to two hydrogen atoms (-CH2-) and connected by single bonds to two other distinct atoms in the rest of the molecule). MDI is commonly called Polymeric, Monomeric, or Modified MDI and may also be referred to under other names, including Methylene bisphenyl isocyanate, 4,4′-Diphenylmethane diisocyanate, Methylene di-p-phenylene ester of isocyanic acid, Methylene bis(4-phenyl isocyanate), and polymethylene polyphenylene isocyanate. MDI is normally associated with Chemical Abstracts Service (CAS) registry numbers 9016-87-9, 101-68-8, 5873-54-1, 2536-05-2, 1689576-89-3, 25686-28-6, 26447-40-5, and 39310-05-9, but several others are also used.
MDI ranges in physical form from low viscosity liquids to solids. MDI is covered by the scope of this investigation irrespective of whether it has gone through a distillation process and regardless of acid content, reactivity, functionality, freeze stability, physical form, viscosity, grade, purity, molecular weight, or packaging.
MDI may contain additives, such as catalysts, solvents, plasticizers, antioxidants, fire retardants, colorants, pigments, diluents, thickeners, fillers, softeners, toughening agents. The scope does not include mixtures of MDI with other materials, when the combined MDI component comprises less than 40 percent of the total weight of the mixture.
MDI may be partially reacted with itself, polyol, or polyamines, and retain MDI component that has not fully chemically reacted so as to convert it into a different product no longer containing isocyanate groups. These products are known as homopolymer, uretonimine MDI, carbodiimide MDI, or prepolymers. The scope does not include partially reacted MDI when its NCO content is less than 10 weight percentage.
For MDI that enter as part of a system with separately packaged resin consisting mostly of a chemical compound that has an OH reactive group, including polyol, only the MDI portion of the system is included in the scope. The scope does not include any separately packaged polyol that would not fall within the scope if entered on its own.
The scope includes merchandise matching the above description that has been processed in a third country, including by commingling, diluting, introducing or removing additives, or performing any other processing that would not otherwise remove the merchandise from the scope of the investigation if performed in the subject country.
The scope also includes MDI that is commingled or blended with MDI from sources not subject to this investigation. Only the subject component of such commingled products is covered by the scope of this investigation.
This merchandise is currently classifiable under Harmonized Tariff Schedule of the United States (HTSUS) subheadings 2929.10.8010 and 3909.31.0000. Subject merchandise may also be entered under subheadings 3824.99.2600, 3909.50.1000, 3909.50.2000, 3909.50.5000, 3824.99.2900, 3506.91.5000, 3911.90.4500, 3921.13.5000, and 3920.99.5000. The HTSUS subheadings are provided for convenience and customs purposes only; the written description of the scope is dispositive.
*Background.* —The final phase of this investigation is being scheduled, pursuant to section 735(b) of the Tariff Act of 1930 (19 U.S.C. 1673d(b)), as a result of an affirmative preliminary determination by Commerce that imports of methylene diphenyl diisocyanate (mdi) from China are being sold in the United States at less than fair value within the meaning of § 733 of the Act (19 U.S.C. 1673b). The investigation was requested in a petition filed on February 12, 2025, by the MDI Fair Trade Coalition consisting of BASF Corporation, Florham Park, New Jersey; and The Dow Chemical Company, Midland, Michigan.
For further information concerning the conduct of this phase of the investigation, hearing procedures, and rules of general application, consult the Commission's Rules of Practice and Procedure, part 201, subparts A and B (19 CFR part 201), and part 207, subparts A and C (19 CFR part 207).
*Participation in the investigation and public service list.* —Persons, including industrial users of the subject merchandise and, if the merchandise is sold at the retail level, representative consumer organizations, wishing to participate in the final phase of this investigation as parties must file an entry of appearance with the Secretary to the Commission, as provided in § 201.11 of the Commission's rules, no later than 21 days prior to the hearing date specified in this notice. A party that filed a notice of appearance during the preliminary phase of the investigation need not file an additional notice of appearance during this final phase. The Secretary will maintain a public service list containing the names and addresses of all persons, or their representatives, who are parties to the investigation.
Please note the Secretary's Office will accept only electronic filings during this time. Filings must be made through the Commission's Electronic Document Information System (EDIS, *https://edis.usitc.gov* ). No in-person paper-based filings or paper copies of any electronic filings will be accepted until further notice.
*Limited disclosure of business proprietary information (BPI) under an administrative protective order (APO) and BPI service list.* —Pursuant to § 207.7(a) of the Commission's rules, the Secretary will make BPI gathered in the final phase of this investigation available to authorized applicants under the APO issued in the investigation, provided that the application is made no later than 21 days prior to the hearing date specified in this notice. Authorized applicants must represent interested parties, as defined by 19 U.S.C. 1677(9), who are parties to the investigation. A party granted access to BPI in the preliminary phase of the investigation need not reapply for such access. A separate service list will be maintained by the Secretary for those parties authorized to receive BPI under the APO.
*Staff report.* —The prehearing staff report in the final phase of this investigation will be placed in the nonpublic record on January 12, 2026, and a public version will be issued thereafter, pursuant to § 207.22 of the Commission's rules.
*Hearing.* —The Commission will hold a hearing in connection with the final phase of this investigation beginning at 9:30 a.m. on Tuesday, January 27, 2026. Requests to appear at the hearing should be filed in writing with the Secretary to the Commission on or before Wednesday, January 21, 2026. Any requests to appear as a witness via videoconference must be included with your request to appear. Requests to appear via videoconference must include a statement explaining why the witness cannot appear in person; the Chairman, or other person designated to conduct the investigation, may in their discretion for good cause shown, grant such a request. Requests to appear as remote witness due to illness or a positive COVID-19 test result may be submitted by 3:00 p.m. the business day prior to the hearing. Further information about participation in the hearing will be posted on the Commission's website at *https://www.usitc.gov/calendarpad/calendar.html.*
A nonparty who has testimony that may aid the Commission's deliberations may request permission to present a short statement at the hearing. All parties and nonparties desiring to appear at the hearing and make oral presentations should attend a prehearing conference, if deemed necessary, to be held at 9:30 a.m. on Thursday, January 22, 2026. Parties shall file and serve written testimony and presentation slides in connection with their presentation at the hearing by no later than noon on January 26, 2026. Oral testimony and written materials to be submitted at the public hearing are governed by sections 201.6(b)(2), 201.13(f), and 207.24 of the Commission's rules. Parties must submit any request to present a portion of their hearing testimony *in camera* no later than 7 business days prior to the date of the hearing.
*Written submissions.* —Each party who is an interested party shall submit a prehearing brief to the Commission. Prehearing briefs must conform with the provisions of § 207.23 of the Commission's rules; the deadline for filing is January 20, 2026. Parties shall also file written testimony in connection with their presentation at the hearing, and posthearing briefs, which must conform with the provisions of section 207.25 of the Commission's rules. The deadline for filing posthearing briefs is February 3, 2026. In addition, any person who has not entered an appearance as a party to the investigation may submit a written statement of information pertinent to the subject of the investigation, including statements of support or opposition to the petition, on or before February 3, 2026. On February 20, 2026, the Commission will make available to parties all information on which they have not had an opportunity to comment. Parties may submit final comments on this information on or before February 24, 2026, but such final comments must not contain new factual information and must otherwise comply with § 207.30 of the Commission's rules. All written submissions must conform with the provisions of § 201.8 of the Commission's rules; any submissions that contain BPI must also conform with the requirements of §§ 201.6, 207.3, and 207.7 of the Commission's rules. The Commission's *Handbook on Filing Procedures,* available on the Commission's website at *https://www.usitc.gov/documents/handbook_on_filing_procedures.pdf,* elaborates upon the Commission's procedures with respect to filings.
Additional written submissions to the Commission, including requests pursuant to § 201.12 of the Commission's rules, shall not be accepted unless good cause is shown for accepting such submissions, or unless the submission is pursuant to a specific request by a Commissioner or Commission staff.
In accordance with §§ 201.16(c) and 207.3 of the Commission's rules, each document filed by a party to the investigation must be served on all other parties to the investigation (as identified by either the public or BPI service list), and a certificate of service must be timely filed. The Secretary will not accept a document for filing without a certificate of service.
*Authority:* This investigation is being conducted under authority of title VII of the Tariff Act of 1930; this notice is published pursuant to § 207.21 of the Commission's rules.
By order of the Commission.
Issued: September 23, 2025.
Sharon Bellamy,
Supervisory Hearings and Information Officer.