Elastomeric Polyether Polysulfide Resin PER-50 from Canada
Elastomeric Polyether Polysulfide Resin PER-50 is a primary form copolymer for flexible sealants in construction. It qualifies for HTS 3911.90.10.00 as an elastomeric polysulfide where the named units contribute ≥95% by weight per subheading note (a)(2). The polyether modification enhances flexibility without altering primary classification.
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
• Provide FTIR or NMR analysis confirming ≥95% polysulfide/polyether comonomer content for subheading (a)(2)
• Label clearly as 'primary form' to prevent confusion with finished adhesives in 3506 or 3921