Key facts
- HS subheading
- 3913.90
- National lines
- 4
- Tariff
- United States
- Chapter
- 39: Plastics and articles thereof
Summary
The United States tariff splits HS 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) into 4 national lines: 3913.90.10.00 (chemical derivatives of natural rubber), 3913.90.20.15 (xanthan gum), 3913.90.20.90 (other) and 3913.90.50.00 (other). The general (MFN) duty differs by line: free on 3913.90.10.00, 5.8% on 3913.90.20.15, 5.8% on 3913.90.20.90 and 6.5% on 3913.90.50.00.
United States lines under 3913.90
The United States tariff splits HS 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) into 4 national lines: 3913.90.10.00 (chemical derivatives of natural rubber), 3913.90.20.15 (xanthan gum), 3913.90.20.90 (other) and 3913.90.50.00 (other).
The general (MFN) duty differs by line: free on 3913.90.10.00, 5.8% on 3913.90.20.15, 5.8% on 3913.90.20.90 and 6.5% on 3913.90.50.00.
- 3913.90.10.00Chemical derivatives of natural rubberDuty: Free
- 3913.90.20.15Xanthan gumDuty: 5.8%
- 3913.90.20.90OtherDuty: 5.8%
- 3913.90.50.00OtherDuty: 6.5%
In other countries
No other national tariff on border.bot has live lines under 3913.90 yet.
Frequently asked questions
How many national tariff lines does the United States tariff have under HS 3913.90?
The United States tariff splits HS 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) into 4 national lines: 3913.90.10.00 (chemical derivatives of natural rubber), 3913.90.20.15 (xanthan gum), 3913.90.20.90 (other) and 3913.90.50.00 (other).
What is the duty on HS 3913.90 in the United States?
The general (MFN) duty differs by line: free on 3913.90.10.00, 5.8% on 3913.90.20.15, 5.8% on 3913.90.20.90 and 6.5% on 3913.90.50.00.
Sources and updates
The tariff lines for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.
The duty rates for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.
The trade programmes for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.
This page was last updated on 9 October 2026.
Guidance from published tariff data, not a binding ruling. For a decision customs must follow, apply to the destination’s customs authority for a binding tariff ruling.
Official source files: