HS Code 3913
Natural and Modified Polymers
HS code 3913 covers natural polymers like alginic acid and modified proteins in primary forms used as thickeners, stabilisers, and industrial raw materials.
4-digit Section VIIFCL
HS Code 3913 — Natural and Modified Polymers
This category includes polymers derived from nature, like alginic acid from seaweed or modified rubber. They are essential in food production, medical applications, and textile sizing.
What's included
- Alginic acid
- Alginates
- Hardened proteins
- Chlorinated rubber
- Chitosan
What's excluded
- Unmodified natural gums → use
1301(Unmodified gums are agricultural products, not polymers.)
Common examples
- Sodium alginate powder
- Chlorinated natural rubber pellets
- Chitosan from crustacean shells
- Hardened casein
Frequently asked questions
What products use alginates?
They are widely used in the food industry as thickening agents and in dentistry for taking tooth impressions.
Trade & shipping notes
- Typical duty range: 0% - 6.5%
- Documentation: Food-grade vs industrial-grade certificates are often required.
- Typical shipping mode: FCL
- Top exporters: China, Norway, France, United States
- Top importers: United States, Germany, Japan, South Korea
Related HS codes
Key takeaway
Covers high-value bio-derived polymers used in specialised industries.
Related HS codes
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