3911.90.10.00/Elastomeric Polyether Polysulfide Resin PER-50/Japan

Elastomeric Polyether Polysulfide Resin PER-50 from Japan

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 — Japan → United States

12.5%

Rate breakdown

9903.05.4912.5%Section 301 (forced labor) — Japan (col1 rate < 12.5 percent): MFN < 12.5% → total duty capped at 12.5%

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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