3913.90.10.00/Maleated Natural Rubber (MNR)/Japan

Maleated Natural Rubber (MNR) from Japan

MNR features maleic anhydride grafted onto natural rubber backbone for better adhesion in rubber composites. Supplied as primary crumb or powder. Grafting qualifies it as chemical derivative 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

• Include grafting degree (% maleic anhydride) analysis to prove chemical modification

• Distinguish from physical blends (which stay 4002) via solubility tests or spectroscopy

• Mark containers 'primary polymer form - not for direct use' to prevent article misclassification