3913.90.10.00/Hydroxyl-Terminated Polyisoprene (HTPI)/Japan

Hydroxyl-Terminated Polyisoprene (HTPI) from Japan

HTPI is a telechelic natural rubber derivative with hydroxyl end-groups, used as a reactive prepolymer in polyurethane elastomers and adhesives. Supplied as viscous liquid or solid in drums. HTS 3913.90.1000 covers this chemically modified natural rubber in primary form.

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

• Include end-group analysis (OH content) and molecular weight data to prove chemical modification status

• Declare exact polyisoprene content (>95%) to meet polymer naming rules in subheading note (a)(1)

• Prevent reclassification to 3909 by ensuring not presented as polyurethane prepolymer solution