Import duty on Natural polymers (e.g. alginic acid) and modified natural polymers (e.g. hardened proteins, chemical derivatives of natural rubber), n.e.c. or included, in primary forms (HS 3913)

Heading 3913 covers 2 tariff lines in LoadLoom's table; 1 of them clear duty-free under USMCA for goods made in Canada, the US or Mexico. Published US and Canadian rates below, verified October 2026. Pick the line that matches your goods for the worked example and border steps.

HS code	Goods	US duty	Canada duty	USMCA
3913.10	Polymers, natural; alginic acid, its salts and esters, in primary forms	4.2%	Free	Free with certificate
3913.90	Polymers, natural and modified natural; in primary forms (excluding alginic acid, its salts and esters)	Free	Free	Not eligible

This page is a free reference for shippers, not a customs ruling. Final classification and duty are determined by the licensed customs broker at entry, and government amounts are always billed at actual. Rates change with each tariff edition and trade action.

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Chapter 39: Plastics and articles thereof · Every chapter