HEADING 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:
Part of Chapter 39 — Plastics and Articles Thereof, Section VII.
Subheadings and tariff lines
Recent CBP rulings on heading 3913
N355070
October 30, 2025
The tariff classification of poly(3-hydroxybutyrate)-co-3-hydroxyhexanoate) from Japan
H341787
May 13, 2025
Enerzan L (20); United States-Mexico-Canada Agreement; Country of Origin; Marking
H327577
May 8, 2024
Application for Further Review of Protest No. 300422101621; SIPCO Innovations Inc.; USMCA Preference Eligibility for Plant Fertilizer Amendment; Section 301 Trade Remedy
H334088
March 29, 2024
USMCA Eligibility of Lubrigel L; Country of Origin Marking
N334307
August 9, 2023
The tariff classification of chitosan from India
N334040
August 2, 2023
The tariff classification of yeast beta glucan from China
N330860
February 22, 2023
The tariff classification of Arabinoxylan (CAS No. 9040-27-1) from Poland
N328429
October 12, 2022
The tariff classification of potassium humate from Germany
N310660
April 3, 2020
The tariff classification of chitosan lactate (CAS# 66267-50-3) from China
N298179
June 28, 2018
The tariff classification of Xanthan Gum from China
N279164
February 8, 2017
The tariff classification of Liquid Organo Hume from Canada.
N274764
May 4, 2016
The tariff classification of Chitosan Powder from China
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