Elastomeric Polyether Polysulfide Resin PER-50 from Mexico
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 — 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
• 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