Question 1

What is the total import duty on HS 3913 from China in 2026?

Accepted Answer

Importing HS 3913 (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:) from China in 2026 faces an estimated total of 35%: Free MFN base, plus 25% Section 301 (China), 10% Section 122 Surcharge. Use the free duty calculator to stack MPF/HMF and get a per-shipment landed cost.

Question 2

Does HS 3913 qualify for USMCA treatment from Mexico or Canada?

Accepted Answer

USMCA-qualifying goods under HS 3913 from Mexico or Canada are exempt from the Section 122 reciprocal surcharge and Section 301 tariffs, leaving only the Free MFN base rate. Goods must meet the applicable USMCA rule of origin to claim the preference.

Question 3

Can I claim a duty refund on past imports of HS 3913?

Accepted Answer

Importers who paid IEEPA-based reciprocal duties on HS 3913 before the February 2026 SCOTUS ruling may be eligible for a refund through CBP's CAPE portal. Eligibility depends on your entry dates, liquidation status, and whether your goods were covered by the struck-down tariff actions. Use the free refund estimator to check.

Origin	MFN Base	Stacked Programs	Est. Total
China	Free	301 +25%S122 +10%	35%
Mexico (USMCA)	Free	None	0%
Canada (USMCA)	Free	None	0%
Vietnam	Free	S122 +10%	10%
Germany (EU)	Free	S122 +10%	10%
India	Free	S122 +10%	10%
South Korea	Free	S122 +10%	10%

3913

Frequently Asked Questions

What is the total import duty on HS 3913 from China in 2026?

Does HS 3913 qualify for USMCA treatment from Mexico or Canada?

Can I claim a duty refund on past imports of HS 3913?

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