Tetramethylthiuram Monosulfide (TMTM) from China
Tetramethylthiuram monosulfide, commonly known as TMTM, is a thiuram monosulfide classified under HTS 2930.30.30.00 as an organo-sulfur compound used primarily as an accelerator in rubber vulcanization processes. It facilitates faster curing of rubber compounds at elevated temperatures, improving the mechanical properties of tires and industrial rubber products.
Duty Rate — China → United States
12.5%
Rate breakdown
9903.05.3112.5%Section 301 (forced labor) — additional 12.5% ad valorem on products of China
Import Tips
• Verify chemical purity and provide Safety Data Sheets (SDS) for customs clearance; ensure packaging complies with DOT hazardous material regulations
• Common pitfall: mislabeling as di-sulfide variant leading to wrong HTS classification