Thiol-Terminated Polysulfide Prepolymer LP-3 from China
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 — China → United States
37.5%
Rate breakdown
9903.88.0225%Except as provided in headings 9903.88.12, 9903.88.17, 9903.88.20, 9903.88.54, 9903.88.59, 9903.88.61, 9903.88.63, 9903.88.66, 9903.88.67, 9903.88.68, 9903.88.69, or 9903.88.70, articles the product of China, as provided for in U.S. note 20(c) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(d)
9903.05.3112.5%Section 301 (forced labor) — additional 12.5% ad valorem on products of China
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