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Dry Ice Blocks for Shipping

Dry ice is the solid phase of carbon dioxide, a separate chemically defined compound of non-metal oxygen. It is classified under tariff item 2811.21.00 as carbon dioxide, regardless of physical state, and is not excluded by Chapter 28 notes.

Food-Grade CO2 for Beverage Carbonation

Food-grade carbon dioxide is a pure, chemically defined inorganic compound of carbon and oxygen, meeting Chapter 28 note 1 criteria. It falls under tariff item 2811.21.00 as carbon dioxide, even when used in beverages.

Industrial Carbon Dioxide Gas Cylinder

Industrial carbon dioxide gas in cylinders is a separate chemically defined compound, classifiable under tariff item 2811.21.00. The steel cylinder is packaging, not a separate good, and does not affect classification.

Laboratory Carbon Dioxide 99.999% Pure

Ultra-high purity laboratory carbon dioxide is a separate chemically defined compound, meeting Chapter 28 note 1(a). It is classifiable under tariff item 2811.21.00, with no exclusions for laboratory use.

Liquid Carbon Dioxide Bulk Tanker

Liquid carbon dioxide in bulk tankers is carbon dioxide in a liquid state, a separate chemically defined compound. It falls under tariff item 2811.21.00, as the heading covers all physical states of CO2.

Medical-Grade Carbon Dioxide USP

Medical-grade carbon dioxide USP is a pure, chemically defined compound of carbon and oxygen, classifiable under tariff item 2811.21.00. Chapter 28 notes do not exclude pharmaceutical-grade inorganic compounds unless put up as medicaments (Chapter 30).

pH Correction Carbon Dioxide

Carbon dioxide for pH correction is a separate chemically defined compound, classifiable under tariff item 2811.21.00. Its use to form carbonic acid in solution does not change its identity as CO2.

Welding Shielding Gas CO2

Welding shielding gas carbon dioxide is a pure, chemically defined compound, classifiable under tariff item 2811.21.00. The heading covers CO2 regardless of industrial application, and no Chapter 28 exclusion applies.

Coarse-Pore Synthetic Silica Gel for Water Filtration

Coarse-pore synthetic silica gel used in preliminary water filtration stages. It is a separate chemically defined compound of silicon dioxide, meeting Chapter 28 Note 1 criteria.

Colloidal Silica Dispersion (50% Solids)

Colloidal silica dispersion with 50% solids, used in semiconductor polishing. It is silicon dioxide suspended in water, meeting Chapter 28 Note 1(b) for aqueous solutions.

Food-Grade Synthetic Silica Gel Capsules

Encapsulated synthetic silica gel for moisture control in food packaging. The silica gel core is a separate chemically defined compound, and the encapsulation does not alter its classification.

Fumed Silica (Aerosil)

Fumed silica produced by flame hydrolysis, a form of synthetic silicon dioxide. It is a separate chemically defined compound, meeting Chapter 28 criteria.

High-Purity Silica Powder for LEDs

High-purity silica powder for LED phosphor production, with purity above 99.99%. It is a separate chemically defined compound of silicon dioxide.

High-Purity Synthetic Silica Gel for Chromatography

High-purity synthetic silica gel for chromatography, with controlled pore size. It is a separate chemically defined compound of silicon dioxide, suitable for laboratory use.

Indicator Silica Gel with Cobalt Chloride

Indicator silica gel impregnated with cobalt chloride for moisture detection. The base is synthetic silicon dioxide, and the cobalt chloride acts as a colouring substance for identification, per Chapter 28 Note 1(e).

Micronized Synthetic Silica Gel for Cosmetics

Micronized synthetic silica gel used as a mattifying agent in cosmetics. It is a separate chemically defined compound of silicon dioxide, meeting Chapter 28 criteria.

Nano-Silica Particles (20 nm)

Nano-sized amorphous silicon dioxide particles produced via sol-gel process. They are a separate chemically defined compound, meeting Chapter 28 criteria.

Precipitated Silica Powder

Precipitated silica powder, a form of synthetic amorphous silicon dioxide. It is a separate chemically defined compound, meeting Chapter 28 criteria.

Self-Indicating Silica Gel in Reusable Containers

Self-indicating silica gel in reusable plastic containers for camera lens storage. The silica gel is the essential component, and the container is incidental packaging.

Synthetic Amorphous Silica Gel

Synthetic amorphous silica gel is a porous, granular form of silicon dioxide produced by acidifying sodium silicate. It is a chemically defined inorganic compound of silicon dioxide, which falls under tariff item 2811.22.00 as 'other inorganic oxygen compounds of non-metals.' Its primary use as a desiccant does not alter its classification as a basic chemical.

Synthetic Silica Gel Beads for Gas Drying

Synthetic silica gel beads for industrial gas drying. These are separate chemically defined compounds of silicon dioxide, used for dehydration.

Synthetic Silica Gel Desiccant Packets

Synthetic silica gel desiccant packets for moisture absorption in packaging. The silica gel is a separate chemically defined compound, and the packet is packaging.

Synthetic Silica Gel for Pharmaceutical Packaging

Tyvek-wrapped synthetic silica gel units for pharmaceutical packaging. The silica gel core is a separate chemically defined compound, and the Tyvek wrap is protective.

Synthetic Silica Gel Powder for Catalyst Support

Fine powder synthetic silica gel used as an inert catalyst support. It is a separate chemically defined compound of silicon dioxide, before any impregnation with active metals.

ACS Reagent Selenium Dioxide

ACS reagent grade selenium dioxide for high-precision analytical and research applications. It is a pure, chemically defined inorganic oxygen compound of the non-metal selenium, meeting Chapter 28 note 1 requirements.

Anhydrous Sulfur Dioxide for Wine Preservation

High-purity anhydrous sulfur dioxide gas used in winemaking to prevent oxidation and microbial growth. This chemically defined inorganic oxygen compound of sulfur meets the Chapter 28 criteria for separate chemical compounds, whether or not containing impurities. Supplied in pressurized containers for direct use in wine preservation.

Antimony Trioxide

Antimony trioxide (Sb₂O₃) used as a flame retardant in plastics and a catalyst in PET production. This fine white powder is an inorganic oxygen compound of the non-metal antimony, classified under Chapter 28. The product is a chemically defined compound in its pure form.

Arsenic Trioxide

Arsenic trioxide (As₂O₃), a white powder used in pharmaceuticals and glass production, is an inorganic oxygen compound of the non-metal arsenic. This chemically defined compound falls under Chapter 28 as an 'other' inorganic oxygen compound of non-metals. The product is supplied in pure form for various industrial applications.

Arsenic Trioxide Anhydrous Powder

Arsenic trioxide (As2O3) in anhydrous powder form, a white crystalline inorganic compound. It is a chemically defined inorganic oxygen compound of the non-metal arsenic, used primarily in industrial applications such as glass production and metallurgy.

Arsenic Trioxide Flake Form

Arsenic trioxide in dense flake form, used for easier handling in metallurgy and glass decolorizing processes. It is a chemically defined inorganic oxygen compound of the non-metal arsenic, falling under this tariff item.

Arsenic Trioxide Laboratory Reagent

ACS-grade arsenic trioxide for analytical chemistry and toxicology testing in laboratories. It is a pure, chemically defined inorganic oxygen compound of the non-metal arsenic, meeting the requirements of Chapter 28 note 1.

Boron Trioxide (Boric Oxide)

Boron trioxide (B₂O₃) is a pure inorganic oxygen compound of the non-metal boron, used in glass manufacturing and as a flux. This chemically defined compound is classified under Chapter 28 as an 'other' inorganic oxygen compound of non-metals. The product is available as a white powder or glassy solid.

Bulk Arsenic Trioxide for Pesticide Production

Bulk-packed arsenic trioxide serving as an intermediate for organoarsenic pesticide production. It is a chemically defined inorganic oxygen compound of the non-metal arsenic, excluding organo-inorganic compounds per Chapter 28 note 3.

Dinitrogen Pentoxide

Dinitrogen pentoxide (N₂O₅), the anhydride of nitric acid, used in nitrating mixtures. This inorganic oxygen compound of nitrogen is classified under Chapter 28 as a chemically defined compound. The product is an unstable white solid that requires careful handling and storage.

Food-Grade Sulfur Dioxide for Dried Fruit Processing

USP-grade sulfur dioxide gas for treating dried fruits and vegetables to prevent browning and spoilage. This pure chemically defined inorganic compound of sulfur falls under Chapter 28 as a separate chemical element compound. Supplied in small cylinders specifically for food processing applications.

Germanium Dioxide

Germanium dioxide (GeO₂) used in fiber optics and phosphors. This inorganic oxygen compound of the metalloid germanium is classified under Chapter 28 as a non-metal compound. The product is available as hexagonal white crystals in pure form.

High Purity Arsenic Trioxide 99.9%

Ultra-high purity 99.9% arsenic trioxide crystals for semiconductor doping and research applications. It is a chemically defined inorganic oxygen compound of the non-metal arsenic, excluding doped forms per Chapter 28 note 8.

Industrial Arsenic Trioxide for Glass Manufacturing

Arsenic trioxide optimized for fining and decolorizing in optical glass production. It is a chemically defined inorganic oxygen compound of the non-metal arsenic, classified under this tariff item per Chapter 28 definitions.

Industrial Grade Sulfur Dioxide Gas

Pure sulfur dioxide gas supplied in high-pressure steel cylinders for industrial applications such as chemical synthesis and fumigation. As a chemically defined inorganic oxygen compound of sulfur, it qualifies under Chapter 28. The product is in its elemental compound form without additional processing.

Industrial Selenium Dioxide Flakes

Selenium dioxide in flake form for large-scale use in pigment manufacturing and metal finishing electrolytes. It is a chemically defined inorganic oxygen compound of the non-metal selenium, classified under this tariff item.

Iodine Pentoxide

Iodine pentoxide (I₂O₅), a powerful oxidizing agent and CO₂ detector, is an inorganic oxygen compound of the non-metal iodine. This chemically defined compound is classified under Chapter 28. The product is a white powder used in analytical chemistry and industrial applications.

Liquid Sulfur Dioxide for Chemical Synthesis

Liquefied sulfur dioxide at -10°C for use as a reagent in sulfonation reactions and sulfite production. This inorganic oxygen compound of non-metal sulfur is transported in insulated tank containers. The product is a pure chemically defined compound meeting Chapter 28 requirements.

Nitrogen Dioxide (Anhydrous)

Anhydrous nitrogen dioxide (NO₂), a reddish-brown gas, used in nitration processes and as a rocket propellant oxidizer. As an inorganic oxygen compound of the non-metal nitrogen, it is classified under Chapter 28. The product is supplied in cylinders for industrial applications.

Pharmaceutical Grade Arsenic Trioxide

High-purity arsenic trioxide USP grade for use in leukemia treatments like Trisenox, prior to formulation into medicaments. It is a chemically defined inorganic oxygen compound of the non-metal arsenic, falling under this tariff item as a bulk chemical.

Phosphorus Pentoxide

Phosphorus pentoxide (P4O10), also known as phosphoric anhydride, is a white, highly hygroscopic powder used primarily as a desiccant and dehydrating agent in chemical synthesis. As a chemically defined inorganic oxygen compound of the non-metal phosphorus, it falls under tariff item 2811.29.00 for other inorganic oxygen compounds of non-metals. It is not excluded by Chapter 28 notes and is not a metal salt, so it is correctly classified here.

Refined Arsenic Trioxide Crystals

Sublimed, refined arsenic trioxide crystals for high-precision applications in electronics precursors. It is a chemically defined inorganic oxygen compound of the non-metal arsenic, classified under this tariff item.

Selenium Dioxide

Selenium dioxide (SeO2) is a white, volatile crystalline solid used in organic synthesis, as an oxidizing agent, and in glass coloring. As a chemically defined inorganic oxygen compound of the non-metal selenium, it is classified under tariff item 2811.29.00. Chapter 28 notes exclude doped forms for electronics, which would fall under heading 38.18, so this product is correctly placed here when unworked.

Selenium Dioxide 99.9% Crystals

High-purity 99.9% selenium dioxide in crystalline form for semiconductor doping and specialty chemical synthesis. It is a chemically defined inorganic oxygen compound of the non-metal selenium, excluding doped forms per Chapter 28 note 8.

Selenium Dioxide Powder

Pure selenium dioxide (SeO2) in fine powder form, used primarily as a chemical reagent in laboratory settings for organic synthesis and analytical chemistry. It is a chemically defined inorganic oxygen compound of the non-metal selenium.

Silicon Dioxide (Amorphous Silica)

Amorphous silicon dioxide, also known as synthetic silica, is a chemically defined inorganic oxygen compound of the non-metal silicon, used as a desiccant, filler, or in cosmetics. It is classified under tariff item 2811.29.00 as an 'other inorganic oxygen compound of non-metals.' Chapter 28 notes do not exclude it, provided it is not in a form covered by other headings like glass or optical elements.

Sulfur Dioxide Anhydride for Laboratory Research

Research-grade sulfur dioxide generator flasks and replacement chemicals for organic synthesis laboratories. The pure sulfur dioxide is classified under Chapter 28 as a chemically defined inorganic compound. Supplied in small lecture bottle packaging for laboratory use.

Sulfur Dioxide Calibration Gas Mixture 10ppm

Trace-level sulfur dioxide at 10 ppm in nitrogen balance in certified calibration cylinders for environmental air quality monitoring equipment. The sulfur dioxide is the principal component of interest, and the mixture is classified under this tariff item as an inorganic oxygen compound. The product is used for calibrating gas detection instruments.

Sulfur Dioxide for Pulp and Paper Bleaching

Technical grade sulfur dioxide gas dissolved on-site for bisulfite pulping and bleaching in paper manufacturing. This pure sulfur dioxide compound is classified under Chapter 28 as an inorganic oxygen compound of sulfur. Supplied in bulk cylinder deliveries for industrial processing.

Sulfur Trioxide

Sulfur trioxide (SO3) is a colorless to white crystalline solid or liquid, used as a sulfonating agent and in the production of sulfuric acid. As the anhydride of sulfuric acid, it is a chemically defined inorganic oxygen compound of the non-metal sulfur, classified under tariff item 2811.29.00. It is often supplied stabilized to prevent polymerization, which is acceptable under Chapter 28 note 1(d).

Technical Grade Arsenic Trioxide

Technical-grade arsenic trioxide meeting 99% purity standards for industrial use in wood preservation and pesticide manufacturing. It is a chemically defined inorganic oxygen compound of the non-metal arsenic, classified under this tariff item.

Technical Grade Selenium Dioxide

Technical grade selenium dioxide, 98% purity, supplied in bulk for industrial glass coloring and ceramic production. It is a chemically defined inorganic oxygen compound of the non-metal selenium, classified under this tariff item.

Tellurium Dioxide

Tellurium dioxide (TeO2) is a white crystalline powder used in optical glass, acousto-optic devices, and electroceramics. As a chemically defined inorganic oxygen compound of the non-metal tellurium, it is classified under tariff item 2811.29.00. Chapter 28 notes do not exclude it, provided it is not in a doped form for electronics or as an optical element.