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
HTS heading 3913 · chapter 39 · 1 tariff lines · 1 subheadings
Rates below are the general column — the rate for goods from countries with normal trade relations. Compare every line in the heading at once, then open a line for the duty calculator.
Tariff lines in heading 3913
| HTS code | Description | General | Special | Col. 2 |
|---|---|---|---|---|
| 3913.90Other | ||||
| 3913.90.20 | Polysaccharides and their derivatives | 5.8% | Free (A*,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 50% |
Pricing the duty
Open the tariff line that matches your goods — each line page has a calculator that applies the exact rate, including specific duties charged per kilogram.
Open the duty calculatorAbout heading 3913
Heading 3913 covers 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. It splits into 1 six-digit subheadings and 1 US tariff lines, 0 of which are duty-free under the general rate.
Headings are the four-digit level of the Harmonized System — the layer that is identical across all 160-plus countries that use it. The six-digit subheading is also international; the last two digits of each code here are US-specific and do not carry across to another country's tariff.