Liquid Polysulfide Polymer LS-50 from Canada
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 — Canada → United States
10%
Rate breakdown
9903.05.2910%Section 301 (forced labor) — additional 10% ad valorem on products of Canada
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