Liquid Polysulfide Polymer LS-50 from Mexico
Liquid Polysulfide Polymer LS-50 is an elastomeric polysulfide prepolymer in primary form used as a base for sealants and adhesives. It falls under HTS 3911.90.10.00 as an elastomeric product specified in note 3 to Chapter 39, in primary forms (not mixed with other substances). Its high elasticity and sulfur linkages distinguish it from other polymers.
Duty Rate — Mexico → United States
10%
Rate breakdown
9903.05.5510%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.94, articles the product of Mexico, as provided for in U.S. note 52 to this subchapter
Import Tips
• Verify the polymer meets the elastomeric criteria per Chapter 39 Note 3 and provide monomer composition analysis showing predominant units
• Include Certificate of Analysis confirming primary form (not compounded or mixed) to avoid reclassification to 39.15