Chapter 3913 — Customs Tariff Headings
Products classified under Tariff item 39.13
Alginic Acid Powder
Pure alginic acid in powdered primary form, extracted and purified from brown seaweeds such as Laminaria species. This product is the base polymer itself, not a salt or ester, and is used in research, pharmaceuticals, and as a thickening agent.
3913.10.00Ammonium Alginate Solution Concentrate
Concentrated aqueous solution of ammonium alginate, a salt of alginic acid, in primary form for further processing. Used in welding rod coatings and ceramics, this solution is a liquid primary form under the tariff item.
3913.10.00Calcium Alginate Granules
Calcium alginate granules, a calcium salt of alginic acid derived from brown algae, in granular primary form. Used in wound dressings and food applications, this product is a salt of alginic acid under the tariff item.
3913.10.00Food Grade Propylene Glycol Alginate
Food-grade propylene glycol alginate (PGA), an ester of alginic acid, in powdered form for ice cream stabilization. This ester meets FCC standards and is classified under the tariff item as an ester of alginic acid in primary form.
3913.10.00Pharmaceutical Grade Calcium Alginate
USP-grade calcium alginate powder for antacid tablets and encapsulation, sourced from controlled algae harvests. This pharmaceutical-grade salt of alginic acid is in primary form and offers slow-release properties for drug delivery.
3913.10.00Potassium Alginate Flakes
Potassium alginate flakes, a salt of alginic acid derived from Ascophyllum nodosum, in flake form for industrial thickening. This primary form is used in printing pastes and falls under the tariff item as an alginic salt.
3913.10.00Propylene Glycol Alginate (PGA)
Propylene glycol alginate (PGA), an ester of alginic acid partially esterified with propylene glycol, supplied as a powder for food and beverage stabilization. This ester is in primary form and qualifies under the tariff item.
3913.10.00Sodium Alginate Powder
Sodium alginate powder, the sodium salt of alginic acid, a natural polysaccharide extracted from brown seaweed, appearing as a white to yellowish powder in primary form. This salt of alginic acid falls under the tariff item.
3913.10.00Surgical Grade Sodium Alginate
Sterile sodium alginate powder for dental impression materials and hemostatic agents in primary form. This surgical-grade salt of alginic acid is biocompatible and used in alginate impression pastes mixed with calcium sulfate.
3913.10.00Textile Grade Sodium Alginate
High-viscosity sodium alginate powder specifically for reactive printing on cotton fabrics, derived from Macrocystis pyrifera. This salt of alginic acid is in primary form and provides sharp print definition.
3913.90.00Carboxymethyl Guar Gum
Carboxymethyl guar gum is a chemically modified derivative of guar gum, a natural polysaccharide. The carboxymethylation enhances water solubility, making it suitable for cosmetics, oil recovery, and food applications. It is supplied in primary powder form and falls under tariff item 3913.90.00 as a modified natural polymer.
3913.90.00Chitosan Powder
Chitosan powder is a deacetylated derivative of chitin, a natural polysaccharide obtained from crustacean shells. It is used in water treatment, wound care, and agricultural applications. Supplied in primary powder form, it is classified under tariff item 3913.90.00 as a modified natural polymer.
3913.90.00Dextran Powder
Dextran powder is a bacterial polysaccharide produced by fermentation of sucrose using Leuconostoc species. It is used as a plasma volume expander in pharmaceuticals and in laboratory reagents. As a natural polymer in primary powder form, it falls under tariff item 3913.90.00.
3913.90.00Gellan Gum
Gellan gum is a high-molecular-weight polysaccharide produced by bacterial fermentation (Sphingomonas elodea). It is used as a gelling agent in food, pharmaceuticals, and microbiological media. Supplied in primary powder form, it is classified under tariff item 3913.90.00 as a natural polymer.
3913.90.00Guar Gum Powder
Guar gum powder is a galactomannan polysaccharide extracted from guar beans (Cyamopsis tetragonoloba). It is used as a thickener in food, hydraulic fracturing, and textile processing. As a natural polymer in primary powder form, it falls under tariff item 3913.90.00.
3913.90.00Gutta-Percha Resin
Gutta-percha is a natural polymer (trans-1,4-polyisoprene) obtained from Palaquium trees. It is supplied in primary forms such as resin pellets and is used in golf ball covers, dental materials, and electrical insulation. As a natural polymer not elsewhere specified, it falls under tariff item 3913.90.00.
3913.90.00Hydroxyethyl Cellulose
Hydroxyethyl cellulose is a non-ionic cellulose ether produced by reacting cellulose with ethylene oxide. It is used as a thickener in paints, cosmetics, and construction materials. Supplied in primary granular or powder form, it falls under tariff item 3913.90.00 as a chemically modified natural polymer.
3913.90.00Hydroxypropyl Methylcellulose (HPMC)
Hydroxypropyl methylcellulose (HPMC) is a semi-synthetic polysaccharide derived from cellulose through etherification with propylene oxide and methyl chloride. It is widely used in pharmaceuticals for capsule shells and controlled-release formulations, as well as in construction and food. Supplied in primary powder or granular form, it falls under tariff item 3913.90.00.
3913.90.00Locust Bean Gum
Locust bean gum is a galactomannan polysaccharide extracted from the seeds of the carob tree (Ceratonia siliqua). It is used as a thickener and stabilizer in ice cream, dairy products, and cosmetics. Supplied in primary powder form, it falls under tariff item 3913.90.00 as a natural polymer.
3913.90.00Methylcellulose Powder
Methylcellulose powder is a methyl ether of cellulose, produced by treating cellulose with methyl chloride. It is used as a thickener in food products, laxatives, and construction materials. As a chemically modified natural polymer in primary powder form, it falls under tariff item 3913.90.00.
3913.90.00Pectin Powder
Pectin powder is a polysaccharide extracted from citrus peels and apple pomace. It is used as a gelling agent in jams, jellies, and pharmaceutical formulations. As a natural polymer in primary powder form, it falls under tariff item 3913.90.00.
3913.90.00Sodium Alginate Powder
Sodium alginate is a salt of alginic acid derived from brown seaweed. It is used in food texturizing, biomedical applications, and textile printing. Supplied in primary powder form, it falls under tariff item 3913.90.00 as a natural polymer derivative.
3913.90.00Sodium Carboxymethyl Cellulose (CMC)
Sodium carboxymethyl cellulose (CMC) is a water-soluble derivative of cellulose produced by reacting cellulose with sodium hydroxide and monochloroacetic acid. It is used as a thickener in food, pharmaceuticals, and detergents. Supplied in primary powder form, it falls under tariff item 3913.90.00 as a chemically modified natural polymer.
3913.90.00Tara Gum Powder
Tara gum is a galactomannan polysaccharide extracted from the seeds of the tara tree (Caesalpinia spinosa). It is used as a stabilizer in food and cosmetics. Supplied in primary powder form, it falls under tariff item 3913.90.00 as a natural polymer.
3913.90.00Welan Gum
Welan gum is a microbial polysaccharide produced by fermentation of Sphingomonas species. It is used as a thickener and suspending agent in cement, oil drilling, and construction. Supplied in primary powder form, it falls under tariff item 3913.90.00 as a natural polymer.