3913.90.10.00
Chemical derivatives of natural rubber
Classification path
- 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
- Chemical derivatives of natural rubber
Rates of duty
- General (MFN)
- Free
- Column 2Cuba, North Korea, Russia, Belarus
- 20%
- Unit of quantity
- kg
Related lines in heading 3913
About heading 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
Heading 3913 covers natural polymers and modified natural polymers that are not classified elsewhere, as long as they are in primary forms such as powders, granules, lumps or blocks. The heading splits into alginic acid and its salts and esters in 3913.10, and everything else in 3913.90. The 3913.90 lines separate chemical derivatives of natural rubber, polysaccharides such as xanthan gum, and a residual other line.
Full guide to heading 3913Products in this heading
- Sodium alginate, a salt of alginic acid used as a thickener
- Propylene glycol alginate for beverage and food stabilizer use
- Xanthan gum powder in bulk bags or drums
- Chlorinated natural rubber for coatings and adhesives
- Dextran and other fermentation polysaccharides in primary form
- Chemically hardened proteins such as hardened gelatin in powder form
- Pullulan in granular form for film and coating applications
Frequently asked questions
What is the HTS code for xanthan gum?
Xanthan gum is classified under 3913.90.20.15, with a general (MFN) rate of 5.8%.
What is the duty on sodium alginate?
Sodium alginate and other salts and esters of alginic acid fall under 3913.10.00.00, which carries a general (MFN) rate of 4.2%.
How do I classify chlorinated natural rubber?
Chemical derivatives of natural rubber are covered by 3913.90.10.00 at a general (MFN) rate of Free. Other modified natural polymers not named in the specific lines fall to 3913.90.50.00 at 6.5%.
Source: USITC Harmonized Tariff Schedule, retrieved October 21, 2026.