HTS heading · chapter 39
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
Analysis
Heading 3913 of the Harmonized Tariff Schedule 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 divides into 2 six-digit subheadings and 4 eight-digit tariff lines, with 5 ten-digit statistical suffixes below them.
The spread of 6.5 percentage points between the cheapest and dearest lines makes misclassification expensive here. The highest rate, 6.5%, applies to 3913.90.50 (other: other).
1 of its 4 lines with a percentage rate are duty-free at the general rate (25%) and 3 are dutiable, from duty-free up to 6.5%. The median line pays 5%.
The largest subheadings are 3913.90 (other, 3 lines) and 3913.10 (unnamed, 1 line).
By Census's concordance, most of its statistical lines are made by Synthetic Rubber Manufacturing (325212) and All Other Basic Organic Chemical Manufacturing (325199). Those are the NAICS industries a US producer of these goods would report under.
Tariff lines
| Line | Description | General rate |
|---|---|---|
| 3913.10.00 | Alginic acid, its salts and esters | 4.2% |
| 3913.90.10 | Chemical derivatives of natural rubber | Free |
| 3913.90.20 | Polysaccharides and their derivatives | 5.8% |
| 3913.90.50 | Other: other | 6.5% |