U.S. Customs and Border Protection · CROSS Database · 1 HTS code referenced
Primary HTS Code
3901.90.1000
$15.4M monthly imports
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Court Cases
1 case
CIT & Federal Circuit
Ruling Age
34 years
Data compiled from CBP CROSS Rulings, Census Bureau Trade Data, CourtListener (CIT/CAFC) · As of 2026-05-04 · Updates monthly
The tariff classification of seven Toso CSM chlorosulfonatedpolyethylene synthetic rubbers from Japan.
NY 861742 MAY 14 1991 CLA-2-39:S:N:N1:238 861742 CATEGORY: Classification TARIFF NO.: 3901.90.1000 Mr. Thomas Lentz Tosoh USA, Inc. 1700 Water Place, Suite 204 Atlanta, GA 30339 RE: The tariff classification of seven Toso CSM chlorosulfonated polyethylene synthetic rubbers from Japan. Dear Mr. Lentz: In your letter dated March 22, 1991 you requested a tariff classification ruling. The Toso CSM products designated TS 220, TS 320, TS 340, TS 430, TS 530, TS 930, CN 1030, CN 1160 and CN 1230 are chlorosulphonated polyethylene (chemically modified polyethylene type) in primary forms. The products all conform to Chapter 39, additional United States note 1 as elastomeric plastic materials. The applicable subheading for the Toso CSM products TS220, TS 320, TS 340, TS 430, TS 530, TS 930, CN 1030, CN 1160 and CN 1230 will be 3901.90.1000, Harmonized Tariff Schedule of the United States (HTS), which provides for polymers of ethylene, in primary forms, other, elastomeric. The rate of duty will be free This merchandise may be subject to the regulations of the Environmental Protection Agency, Office of Pesticides and Toxic Substances. You may contact them at 402 M Street, S.W., Washington, D.C. 20460, telephone number (800) 424-9086. This ruling is being issued under the provisions of Section 177 of the Customs Regulations (19 C.F.R. 177). A copy of this ruling letter should be attached to the entry documents filed at the time this merchandise is imported. If the documents have been filed without a copy, this ruling should be brought to the attention of the Customs officer handling the transaction. Sincerely, Jean F. Maguire Area Director New York Seaport