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Thiol-Terminated Polysulfide Prepolymer LP-3 from Germany

Thiol-Terminated Polysulfide Prepolymer LP-3 is a viscous, elastomeric liquid used in aerospace sealants and coatings. Classified under HTS 3911.90.10.00 for elastomeric polysulfides in primary forms per subheading rules on polymer content. Its mercaptan-terminated structure provides elasticity for high-performance applications.

Duty Rate — Germany → United States

10%

Rate breakdown

9903.05.3910%Section 301 (forced labor) — European Union member state (col1 rate < 10 percent): MFN < 10% → total duty capped at 10%

Import Tips

Submit technical data sheets proving >95% polysulfide monomer content to qualify under 3911.90.10

Avoid misdeclaration as rubber by confirming it's unvulcanized primary form, not Chapter 40 material