Natural polymers (for example, alginic acid) and modified natural polymers (for example, hardened proteins, chemical derivatives of natural rubber), not elsewhere specified or included, in primary forms
3913.90.5000 · imported from China
The rates in this summary are the full program rates as the calculator computes them; one or more may not apply to your shipment — the conditions are noted below.
Imports from China currently carry a combined tariff of approximately 31.5% — a 6.5% MFN base rate, plus a 25% Section 301 (List 2) China tariff that has been in effect since August 2018. On a $1,000 shipment, that works out to roughly $315 in duties. The Section 301 rate has no scheduled expiration date and reflects ongoing US-China trade policy; importers should monitor USTR updates for any changes.
AI-generated explanation — an estimate, not a compliance determination.
| Component | Amount |
|---|---|
| MFN base rate | $65.00 |
| Section 301 (List 2) | $250.00 |
| Merchandise Processing Feeminimum fee applies — 0.3464% of this value is below the $33.58 floor | $33.58 |
| Harbor Maintenance Fee | $1.25 |
| Total duties & fees | $349.83 |
Rates as of 2026-07-11 · base rate & classification from the USITC HTS; the §301/§232/§122 rates from USTR & Presidential proclamations
Estimates only — not legal or customs advice.
The Section 301 rate shown is the full List rate. Active USTR product exclusions may reduce or remove it for specific products — check the USTR exclusion portal and confirm with a licensed customs broker.
What else affects this line
Recent changes
No rate changes have been recorded for this chapter recently — this tariff has been stable.