HS Code for Natural polymer

The classification of natural polymers under HS code 3913.90 is determined by the chemical origin and the degree of modification of the substance. Chapter 39 of the Harmonized System generally covers plastics and polymers. While most headings in this chapter deal with synthetic polymers derived from petroleum or coal, heading 3913 is reserved for polymers that occur naturally or are modified versions of natural polymers that do not fit into more specific categories like proteins or starches. Subheading 3913.90 acts as a residual category for these substances, provided they are in primary forms such as liquids, pastes, blocks, or powders. This classification is essential for chemical manufacturers and importers who deal with bio-based materials that serve as precursors for specialized industrial applications. The logic follows that if a polymer is not synthesized from monomers but is instead extracted from biological sources and potentially chemically altered (without losing its polymer character), it belongs here. This includes complex carbohydrates and other organic macromolecules that are not elsewhere specified in the nomenclature. The primary form requirement is strict; once these polymers are shaped into finished articles, they move to other headings within Chapter 39 or other chapters entirely.

Products Included

• Chitin and chitosan extracted from crustacean shells
• Chemical derivatives of natural rubber such as chlorinated rubber
• Hardened proteins (excluding those used as glues)
• Dextran and other modified polysaccharides
• Natural polymers in solutions or dispersions

Common Misclassification

Natural polymers are frequently misclassified under HS code 3913.10, which is specifically reserved for alginic acid and its salts. Another common error is using codes from 3901 to 3911, which are strictly for synthetic polymers like polyethylene or PVC. Furthermore, if the natural polymer has been processed into a specific finished good, it must be classified under the heading for that article (e.g., 3926 for general plastic articles) rather than the primary form code 3913.90. Some importers also confuse these with proteins of Chapter 35, such as casein (3501) or gelatin (3503).

FAQ

What is the HS code for natural polymer?

The HS code for natural polymers and modified natural polymers in primary forms, excluding alginic acid, is 3913.90.

Does this code include synthetic plastics?

No, synthetic plastics are classified under headings 3901 through 3911. HS code 3913.90 is exclusively for polymers of natural origin or their modified versions.