Tetramethylthiuram Disulfide (TMTD) from Canada
Tetramethylthiuram disulfide, commonly known as TMTD, is a thiuram disulfide used primarily as an accelerator in rubber vulcanization processes. It falls under HTS 2930.30.60.00 as it is a thiuram disulfide compound containing sulfur directly linked to carbon atoms, classified as an organo-sulfur compound per Chapter 29 notes. This chemical is supplied as a pure, separate organic compound without additives that would alter its classification.
Duty Rate — Canada → United States
110%
Rate breakdown
9903.04.6096.3%Except as provided in heading 9903.04.61, patented pharmaceutical articles as provided for in subdivisions (c) and (d) of U.S. note 40 to this subchapter
9903.05.2910%Except for products described in headings 9903.05.85–9903.05.93, articles the product of Canada, as provided for in U.S. note 52 to this subchapter
Import Tips
• Verify purity certificate to confirm it meets 'separate chemically defined organic compound' criteria; ensure MSDS and REACH compliance for handling thiuram compounds; avoid packaging that suggests retail sale to prevent reclassification