3913.90.10.00/Liquid Polyisoprene Rubber (LIR)/Japan

Liquid Polyisoprene Rubber (LIR) from Japan

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 — 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

• 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