Chapter 2839 — Customs Tariff Headings

Anhydrous Sodium Metasilicate

Anhydrous sodium metasilicate (Na2SiO3) is the water-free powdered form of this commercial alkali metal silicate, explicitly covered by tariff item 2839.11.00. It serves as a key ingredient in heavy-duty detergents and industrial cleaning compounds, where its high alkalinity and sequestering properties are essential.

Liquid Sodium Metasilicate 50% Solution

A 50% aqueous solution of sodium metasilicate, classified as a commercial sodium metasilicate under tariff item 2839.11.00. Utilized in pulp and paper processing as a defoamer and alkaline agent, this solution is a normal and necessary method of putting up the product for transport and safety.

Metso Beads Sodium Metasilicate

Metso Beads are dense, bead-form anhydrous sodium metasilicate, classified under tariff item 2839.11.00. Designed for easy handling in detergent manufacturing, its low dust and high solubility make it ideal for industrial formulations requiring precise dosing.

PQ Sodium Silicate Solution (Metasilicate Grade)

PQ Sodium Silicate Solution (Metasilicate Grade) is a liquid sodium metasilicate (Na2O·xSiO2) used as a corrosion inhibitor in cooling systems and as a binder in adhesives. It qualifies under tariff item 2839.11.00 as a sodium metasilicate, a separate chemically defined compound of Chapter 28. The product is imported in bulk liquid form, consistent with the chapter's scope for inorganic chemicals.

Sodium Metasilicate for Welding Flux

High-purity sodium metasilicate powder used in welding flux formulations, falling under tariff item 2839.11.00 as a commercial alkali silicate. It provides slag-forming and cleaning properties during welding, and its purity ensures consistent performance.

Sodium Metasilicate Nonahydrate Crystals

Sodium metasilicate nonahydrate (Na2SiO3·9H2O) appears as free-flowing white crystals, a hydrated commercial sodium silicate under tariff item 2839.11.00. Commonly used in laundry powders and metal cleaning compounds, the water of crystallization is integral to its structure.

Sodium Metasilicate Pentahydrate

Sodium metasilicate pentahydrate (Na2SiO3·5H2O) is a hydrated form of sodium metasilicate, a granular or powdered inorganic compound classified under tariff item 2839.11.00 as a commercial sodium silicate. It is widely used in detergents, cleaning agents, and as a corrosion inhibitor.

Colloidal Sodium Silicate Dispersion

A stable colloidal dispersion of sodium silicate nanoparticles designed for precision casting and investment casting shell building. This product is a commercial sodium silicate solution, not a separate chemically defined compound, and therefore falls under the 'Other' tariff item for sodium silicates.

High-Ratio Sodium Silicate for Catalysts

High-ratio sodium silicate with a silica-to-soda ratio of 3.2:1, used in catalyst manufacturing and zeolite production. This commercial sodium silicate is not a metasilicate and falls under the 'Other' tariff item for sodium silicates.

Industrial Sodium Silicate for Detergents

Medium-ratio sodium silicate liquid (2.4:1 SiO2/Na2O) used as a builder in laundry and dishwashing detergents. This commercial sodium silicate solution is not a metasilicate and falls under the 'Other' tariff item for sodium silicates.

Liquid Sodium Silicate Grade 40° Bé

Industrial-grade liquid sodium silicate with a density of 40° Baumé, used in manufacturing corrugated cardboard and paperboard. This commercial sodium silicate solution is not a metasilicate and falls under the 'Other' tariff item for sodium silicates.

Powdered Sodium Silicate Anhydrous

Anhydrous powdered sodium silicate used in detergent formulations and welding rod coatings. This commercial sodium silicate is not a metasilicate and falls under the 'Other' tariff item for sodium silicates.

Sodium Silicate Binder for Abrasives

Liquid sodium silicate binder used for vitrified and resinoid abrasive wheels. This commercial sodium silicate solution is not a metasilicate and falls under the 'Other' tariff item for sodium silicates.

Sodium Silicate for Cardboard Production

Low-viscosity sodium silicate specifically formulated for corrugated cardboard manufacturing, replacing starch in paper bonding processes. This commercial sodium silicate solution is not a metasilicate and falls under the 'Other' tariff item for sodium silicates.

Sodium Silicate for Egg Preservation

Food-grade sodium silicate solution used to coat eggshells for long-term storage without refrigeration. This commercial sodium silicate solution is not a metasilicate and falls under the 'Other' tariff item for sodium silicates.

Sodium Silicate for Refractory Cements

Liquid sodium silicate binder for no-cement castables and refractory mortars in high-temperature applications. This commercial sodium silicate solution is not a metasilicate and falls under the 'Other' tariff item for sodium silicates.

Sodium Silicate for Welding Electrode Flux

Specialty sodium silicate for binding flux coatings on welding electrodes. This commercial sodium silicate solution is not a metasilicate and falls under the 'Other' tariff item for sodium silicates.

Sodium Silicate Lumps (Solid Glass)

Solid lumps or cullet of sodium silicate, also called solid water glass, used in glass manufacturing and refractories. This commercial sodium silicate is not a metasilicate and falls under the 'Other' tariff item for sodium silicates.

Sodium Silicate Precipitated Powder

Precipitated sodium silicate powder from a controlled reaction, used in specialty coatings. This commercial sodium silicate is not a metasilicate and falls under the 'Other' tariff item for sodium silicates.

Sodium Silicate Solution (Water Glass)

A clear, viscous liquid solution of sodium silicate (Na2SiO3) in water, commonly known as water glass. This commercial sodium silicate solution is not a metasilicate and falls under the 'Other' tariff item for sodium silicates.

Technical Grade Sodium Silicate 2.0 Ratio

Technical grade liquid sodium silicate with a 2.0 SiO2/Na2O ratio for general industrial use including adhesives. This commercial sodium silicate solution is not a metasilicate and falls under the 'Other' tariff item for sodium silicates.

Water Glass Solution Grade 3.2

Grade 3.2 water glass (SiO2/Na2O ratio 3.2) solution for soil stabilization and concrete sealing. This commercial sodium silicate solution is not a metasilicate and falls under the 'Other' tariff item for sodium silicates.

AgSil 16H Potassium Silicate Fertilizer Grade

> AgSil 16H is a horticultural potassium silicate solution with a 2.5:1 SiO2:K2O ratio, used for plant nutrition and disease resistance. It is a commercial alkali metal silicate of potassium, meeting the Chapter 28 definition of a separate chemically defined compound or a solution thereof. Although marketed for agricultural use, it is not a fertilizer preparation and remains classifiable under this tariff item.

Anhydrous Sodium Silicate Powder

> Anhydrous sodium silicate powder is a dehydrated powder of sodium silicate used in specialty ceramics and investment casting. It is a commercial alkali metal silicate of sodium, classifiable under this tariff item as a separate chemically defined compound. The product does not contain added stabilizers or other substances that would remove it from Chapter 28.

Industrial Potassium Silicate 40% Solids

> This is a 40% solids aqueous solution of potassium silicate used in paper manufacturing and detergents. It is a commercial alkali metal silicate of potassium, classifiable under this tariff item as a separate chemically defined compound in solution. The product does not contain added stabilizers or other substances that would remove it from Chapter 28.

Liquid Potassium Silicate KAS-10

> KAS-10 is a high-ratio potassium silicate liquid (SiO2:K2O = 3.3:1) for specialty coatings and soil stabilizers. It is a commercial alkali metal silicate of potassium, classifiable under this tariff item as a separate chemically defined compound in solution. The product is not a preparation of Chapter 38.

Liquid Sodium Silicate Grade 40° Bé

> Liquid sodium silicate Grade 40° Bé is an industrial-grade liquid sodium silicate with 40° Baumé density, applied in corrugated board production and pulp bleaching. It is a commercial alkali metal silicate of sodium, classifiable under this tariff item as a separate chemically defined compound in solution. The product is not a preparation of Chapter 38.

Lithium Silicate Solution

> Lithium silicate solution is an aqueous solution of lithium silicate for concrete densifiers and protective coatings. It is a commercial alkali metal silicate of lithium, classifiable under this tariff item as a separate chemically defined compound in solution. The product is not a preparation of Chapter 38.

Potassium Silicate Liquid

> Potassium silicate liquid is a clear liquid solution of potassium silicate used in specialty paints, welding electrodes, and fireproofing agents. It is a commercial alkali metal silicate of potassium, classifiable under this tariff item as a separate chemically defined compound in solution. The product is not a preparation of Chapter 38.

Potassium Silicate Solution (PQ Corporation Kasil #6)

> Kasil

Potassium Waterglass Powder (Technical Grade)

> This is anhydrous potassium silicate powder derived from spray-dried liquid, used in foundry molds and refractory cements. It is a commercial alkali metal silicate of potassium in solid form, classifiable under this tariff item as a separate chemically defined compound. The product does not contain added stabilizers or other substances that would remove it from Chapter 28.

PQ Corporation Kasil #19 Potassium Silicate

> Kasil

PQ Corporation Sodium Silicate N

> PQ Corporation Sodium Silicate N is a neutral-density sodium silicate (SiO2:Na2O ratio ~3.2) for adhesives and catalysts. It is a commercial alkali metal silicate of sodium, classifiable under this tariff item as a separate chemically defined compound in solution. The product is not a preparation of Chapter 38.

Rubian's Sodium Silicate for Detergents

> Rubian's Sodium Silicate for Detergents is a proprietary commercial grade sodium silicate optimized for phosphate-free detergents. It is a commercial alkali metal silicate of sodium, classifiable under this tariff item as a separate chemically defined compound. The product is not a preparation of Chapter 38.

Sodium Metasilicate Pentahydrate Powder

> Sodium metasilicate pentahydrate powder is a crystalline powder form of sodium metasilicate with five water molecules, widely used in heavy-duty cleaners and laundry detergents. It is a commercial alkali metal silicate of sodium, classifiable under this tariff item as a separate chemically defined compound. The product is not a preparation of Chapter 38.

Sodium Silicate Solution (Water Glass)

A viscous, aqueous solution of sodium silicate, commonly known as water glass, used in detergents, adhesives, and as a concrete sealant. It is classified under tariff item 2839.90.00 as a commercial alkali metal silicate, other than those specified elsewhere in the heading.

Spray-Dried Potassium Silicate Beads

> Spray-dried potassium silicate beads are a beaded form of potassium silicate for easy handling in concrete admixtures and catalysts. They are a commercial alkali metal silicate of potassium in solid form, classifiable under this tariff item as a separate chemically defined compound. The product does not contain added stabilizers or other substances that would remove it from Chapter 28.