HS Code Heading

Natural polymers (e.g. alginic acid) and modified natural polymers (e.g. hardened proteins, chemical derivatives of natural rubber), n.e.c. or included, in primary forms

39.13 Heading
Section VII — Plastics and articles thereof; rubber and articles thereof

About HS Code 3913

Heading 3913 covers natural polymers and modified natural polymers, not elsewhere specified or included, in primary forms. This classification is vital for materials derived from natural sources that undergo chemical modification but are not cellulose derivatives (which fall under 3912) or synthetic polymers (3901-3911). The 'primary forms' criterion means the goods are in bulk states like liquids, pastes, powders, granules, flakes, blocks, or lumps, ready for further processing, not yet shaped into finished articles. This heading includes a diverse range of biopolymers and their altered states, such as alginic acid, its salts and esters (alginates), hardened proteins, and chemical derivatives of natural rubber. Examples include casein derivatives, chitosan, carrageenan, and cyclized or chlorinated natural rubber. The scope is critical for industries like food processing, pharmaceuticals, cosmetics, and specialty chemicals, where these natural and modified biopolymers serve as gelling agents, thickeners, stabilizers, binders, or film-forming agents. For instance, alginates are extensively used in food and medical applications, while hardened proteins find use in adhesives and coatings. Accurate classification under 3913 ensures proper customs duties, regulatory compliance, and eligibility for trade benefits. It differentiates these specialized natural-based polymers from both raw natural materials (e.g., natural rubber latex 4001, starches 1108, unmodified proteins 3504) and wholly synthetic plastics within Chapter 39, reflecting their unique position as processed natural substances with enhanced properties.

Products Under This Code

Alginic acid powder, Sodium alginate granules, Calcium alginate powder, Propylene glycol alginate, Carrageenan powder, Chitosan flakes, Hardened casein, Caseinates, Chemically modified starch (not cellulose-based), Chlorinated natural rubber, Cyclized natural rubber, Hydrochlorinated natural rubber, Grafted natural rubber, Oxidized natural rubber, Depolymerized natural rubber, Shellac derivatives, Gellan gum, Xanthan gum (if chemically modified natural origin), Gum Arabic derivatives, Agar-agar derivatives, Pectin derivatives, Modified soy proteins, Modified gelatin, Modified albumin, Protein hydrolysates (if hardened or chemically modified)

Real World Examples

A food ingredient supplier in Ireland exports large quantities of sodium alginate powder, classified under 3913, to various EU countries for use as a gelling agent in confectionery and dairy products. A Japanese manufacturer imports chitosan flakes from Vietnam, processed from crustacean shells, for application in water treatment and biomedical products, relying on the 3913 classification. An American tire company imports chemically modified natural rubber (e.g., cyclized rubber) from Malaysia to enhance specific properties in specialty rubber compounds, ensuring correct tariff application through HS 3913.

Common Misclassification

Traders often confuse Heading 3913 with unmodified natural products, such as raw natural rubber (4001), unmodified starches (1108), or basic proteins (3504), failing to recognize the 'modified' aspect required for 3913. Another common error is to classify cellulose derivatives (e.g., HPMC, CMC) under 3913 instead of the more specific 3912. Conversely, some might incorrectly classify highly processed or compounded forms of these materials, or finished articles, under 3913 when they should be in other headings within Chapter 39 or even other chapters depending on their final form and use.

Subheadings 2

3913.10 Polymers, natural; alginic acid, its salts and esters, in primary forms 3913.90 Polymers, natural and modified natural; in primary forms (excluding alginic acid, its salts and esters)

Related Codes

39.01 Polymers of ethylene, in primary forms 39.02 Polymers of propylene or of other olefins, in primary forms 39.03 Polymers of styrene, in primary forms 39.04 Polymers of vinyl chloride or of other halogenated olefins, in primary forms 39.05 Polymers of vinyl acetate or of other vinyl esters, in primary forms; other vinyl polymers in primary forms 39.06 Acrylic polymers in primary forms 39.07 Polyacetals, other polyethers and epoxide resins, in primary forms; polycarbonates, alkyd resins, polyallyl esters and other polyesters, in primary forms 39.08 Polyamides in primary forms 39.09 Amino-resins, phenolic resins and polyurethanes, in primary forms 39.10 Silicones in primary forms

Industry

This code belongs to the Plastics & Rubber industry.

Trade Overview

Countries with strong agricultural and fisheries sectors, such as those in Southeast Asia (e.g., Malaysia, Indonesia for rubber derivatives) and coastal nations (e.g., Chile, Norway for alginates), are significant exporters. Major importers are industrialized countries with advanced food, pharmaceutical, and chemical industries (e.g., USA, EU member states, Japan, China). Trade agreements frequently offer reduced duties for these biopolymers, recognizing their role as essential raw materials and specialized ingredients in high-value manufacturing sectors.

Frequently Asked Questions

What is HS code 3913?

HS code 3913 is a 4-digit heading in the Harmonized System that covers: Natural polymers (e.g. alginic acid) and modified natural polymers (e.g. hardened proteins, chemical derivatives of natural rubber), n.e.c. or included, in primary forms. Heading 3913 covers natural polymers and modified natural polymers, not elsewhere specified or included, in primary forms. This classification is vital for materials derived from natural sources that undergo chemical modification but are not cellulose derivatives (which fall under 3912) or synthetic polymers (3901-3911). The 'primary forms' criterion means the goods are in bulk states like liquids, pastes, powders, granules, flakes, blocks, or lumps, ready for further processing, not yet shaped into finished articles. This heading includes a diverse range of biopolymers and their altered states, such as alginic acid, its salts and esters (alginates), hardened proteins, and chemical derivatives of natural rubber. Examples include casein derivatives, chitosan, carrageenan, and cyclized or chlorinated natural rubber. The scope is critical for industries like food processing, pharmaceuticals, cosmetics, and specialty chemicals, where these natural and modified biopolymers serve as gelling agents, thickeners, stabilizers, binders, or film-forming agents. For instance, alginates are extensively used in food and medical applications, while hardened proteins find use in adhesives and coatings. Accurate classification under 3913 ensures proper customs duties, regulatory compliance, and eligibility for trade benefits. It differentiates these specialized natural-based polymers from both raw natural materials (e.g., natural rubber latex 4001, starches 1108, unmodified proteins 3504) and wholly synthetic plastics within Chapter 39, reflecting their unique position as processed natural substances with enhanced properties.

What products fall under HS code 3913?

Alginic acid powder, Sodium alginate granules, Calcium alginate powder, Propylene glycol alginate, Carrageenan powder, Chitosan flakes, Hardened casein, Caseinates, Chemically modified starch (not cellulose-based), Chlorinated natural rubber, Cyclized natural rubber, Hydrochlorinated natural rubber, Grafted natural rubber, Oxidized natural rubber, Depolymerized natural rubber, Shellac derivatives, Gellan gum, Xanthan gum (if chemically modified natural origin), Gum Arabic derivatives, Agar-agar derivatives, Pectin derivatives, Modified soy proteins, Modified gelatin, Modified albumin, Protein hydrolysates (if hardened or chemically modified)

What are common misclassifications for HS code 3913?

Traders often confuse Heading 3913 with unmodified natural products, such as raw natural rubber (4001), unmodified starches (1108), or basic proteins (3504), failing to recognize the 'modified' aspect required for 3913. Another common error is to classify cellulose derivatives (e.g., HPMC, CMC) under 3913 instead of the more specific 3912. Conversely, some might incorrectly classify highly processed or compounded forms of these materials, or finished articles, under 3913 when they should be in other headings within Chapter 39 or even other chapters depending on their final form and use.

Which countries trade the most under HS code 3913?

Countries with strong agricultural and fisheries sectors, such as those in Southeast Asia (e.g., Malaysia, Indonesia for rubber derivatives) and coastal nations (e.g., Chile, Norway for alginates), are significant exporters. Major importers are industrialized countries with advanced food, pharmaceutical, and chemical industries (e.g., USA, EU member states, Japan, China). Trade agreements frequently offer reduced duties for these biopolymers, recognizing their role as essential raw materials and specialized ingredients in high-value manufacturing sectors.

How is HS code 3913 structured?

HS code 3913 is a 4-digit heading under Chapter 39 of the Harmonized System. The first 2 digits (39) identify the chapter, and digits 3-4 (13) specify the heading. This code contains multiple 6-digit subheadings for precise product classification.