Tetramethylguanidine (TMG) from Japan
Tetramethylguanidine is a strong organic base classified under HTS 2925.29.70.00 as an imine-function compound and derivative. It features a guanidine structure with four methyl groups, making it a chemically defined compound fitting Chapter 29 note (a). Primarily used as a catalyst in chemical synthesis.
Duty Rate — Japan → United States
12.5%
Rate breakdown
9903.05.4912.5%Except for products described in headings 9903.05.85–9903.05.92, articles the product of Japan, with an ad valorem (or ad valorem equivalent) rate of duty under column 1 less than 12.5 percent, as provided for in U.S. note 52 to this subchapter
Import Tips
• Verify purity certificate (≥98%) to confirm classification as chemically defined compound per Chapter 29 note (a); impurities may shift to mixtures
• Include Safety Data Sheet (SDS) showing non-specific use additives to avoid reclassification under note (g)
• Declare exact CAS number (80-70-6) on entry documents to prevent customs scrutiny