3903.19.00.00/Polystyrene Compounding Base Resin/Japan

Polystyrene Compounding Base Resin from Japan

Narrow molecular weight distribution polystyrene resin designed for compounding, imported in primary form under HTS 3903.19.00.00. Serves as base for custom blends in electronics and packaging industries.

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

• Document polydispersity index (<2.0) to confirm unmodified homopolymer status

• Separate from additives in shipping to prevent blend reclassification

• CBP may test for fillers; ensure pure resin declaration