2-Mercaptoethanol from China
2-Mercaptoethanol (HS-CH2CH2OH) contains both thiol (-SH) and alcohol (-OH) groups with sulfur directly linked to carbon. Classified in 2930.90.92 as other organo-sulfur compound taking precedence in numerical order. Common biochemical reagent for protein denaturation.
Duty Rate — China → United States
3.7%
Rate breakdown
9903.03.030%Articles the product of any country, as provided for in subdivision (aa)(ii) of U.S. note 2 to this subchapter
Import Tips
• Include end-use statement distinguishing lab reagent from industrial solvent to prevent reclassification
• Hazard class 6.1 (toxic liquid); ensure proper UN2922 packaging and marking
• Certificate of analysis required to verify >98% purity for Chapter 29 classification