Heading 3913: Natural polymers (for example, alginic acid) and modified natural polymers (for example…
Every line of heading 3913 in the U.S. Harmonized Tariff Schedule, with its general (column 1) duty rate. Open a code for the landed cost calculator, trade agreement rates and email alerts if the rate changes.
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
Chapter 39: Plastics and articles thereof. Schedule checked on November 8, 2026.
Not always the total: additional chapter 99 duties (such as Section 232 or Section 301), antidumping or countervailing duties may apply depending on the country of origin. See recent chapter 99 changes →
Tariff lines
| HTS code | Official description | General rate |
|---|---|---|
| 3913.10.00.00 | Alginic acid, its salts and esters | 4.2% |
| 3913.90 | Other: | |
| 3913.90.10.00 | Chemical derivatives of natural rubber | Free |
| 3913.90.20 | Polysaccharides and their derivatives | 5.8% |
| 3913.90.20.15 | Xanthan gum | |
| 3913.90.20.90 | Other | |
| 3913.90.50.00 | Other | 6.5% |
Public records · unclaimed listings
U.S. manufacturers in this industry, from public records
These companies are not Fromerica members and did not write these listings: Fromerica created them from public government records and has not verified what the records say. You cannot contact them from here. Open a listing to see what the record says.
- BEDOUKIAN RESEARCH, INC.
- EMBALMERS' SUPPLY COMPANY, THE
- FMI CHEMICAL, INC.
- HAMPFORD RESEARCH, INC.
- KING INDUSTRIES, INC.
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And 3 more in the public records. See all →
Exporting this product from the U.S.?
Exports are reported with Schedule B numbers. Heading 3913 has 3 of them. Schedule B lookup →
- 3913.10.0000ALGINIC ACID,ITS SALTS AND ESTERS
- 3913.90.1000CHEMICAL DERIVATIVES OF NATURAL RUBBER
- 3913.90.8000NATURAL POLYMERS & MODIFIED NATURAL POLYMERS, IN PRIMARY FORMS, NESOI
Source: U.S. International Trade Commission, Harmonized Tariff Schedule; Schedule B: U.S. Census Bureau. Information only, not legal or customs advice; U.S. Customs and Border Protection decides the classification and the duty. Confirm with a licensed customs broker before you ship.
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