3913.90—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, other
General duty rate
Free – 6.5%
Across 4 10-digit lines; pick a line below for the exact rate
Coverage on this page
Plain-English explanation
HTS 3913.90 is a 6-digit subheading of the U.S. Harmonized Tariff Schedule covering 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, other. It sits in Chapter 39: Plastics and articles thereof, Section VII: Plastics and Articles Thereof; Rubber and Articles Thereof and rolls up 4 10-digit statistical lines, with general duty rates ranging from Free to 6.5%. No Chapter 99 tariff modifications or AD/CVD orders currently flag any line under this subheading in Tandom's catalog.
10-digit lines under 3913.90(4)
Pick a line to view full rate detail and compute landed duty
Frequently asked questions
What does HTS 3913.90 cover?
HTS 3913.90 is a 6-digit subheading of the U.S. Harmonized Tariff Schedule covering 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, other. It belongs to Chapter 39 and rolls up 4 10-digit statistical lines that brokers actually file at entry.
What is the duty rate for HTS 3913.90?
General (Column 1) duty rates for the 10-digit lines under HTS 3913.90 range from Free to 6.5%. The exact rate depends on the specific 10-digit statistical line — pick a line below to see its full rate detail.
How do I find the right 10-digit line under HTS 3913.90?
U.S. Customs requires entries to be filed at the 10-digit statistical level — the broader subheading HTS 3913.90 is not directly fileable. Match your product description to the most specific 10-digit line in the list on this page; if multiple lines could apply, the General Rules of Interpretation (GRIs) and chapter notes determine which one governs.
Are there AD/CVD orders affecting HTS 3913.90?
Learn more
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