3913.90.10.00/Liquid Polyisoprene Rubber (LIR)/China

Liquid Polyisoprene Rubber (LIR) from China

LIR-3000/700 series are low molecular weight liquid derivatives of natural cis-1,4-polyisoprene, used as reactive plasticizers in tires and sealants. Primary liquid form in drums. Chemical degradation/polymerization modification places under HTS 3913.90.1000.

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

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Import Tips

• Specify molecular weight (e.g

• 3000-7000 g/mol) and polydispersity to confirm primary liquid polymer status

• Test for residual monomers; >5% may trigger copolymer classification rules

• Hazardous material declaration required for flammable liquids