Chapter 7903 — Customs Tariff Headings
Subheadings
Products classified under Tariff item 79.03
3D Printing Zinc Dust Feedstock
Ultra-fine spherical zinc dust optimized for metal 3D printing powder bed fusion, produced via vapor condensation with a tight particle size distribution of 15-45 μm (all passing a 63 μm sieve) and 99.5% zinc purity. This product meets the Chapter 79 subheading note definition of zinc dust, which requires at least 80% of particles to pass through a 63 μm sieve and at least 85% metallic zinc content.
7903.10.00Anti-Corrosion Zinc Dust Primer Additive
Industrial zinc dust specifically formulated for epoxy primers, condensed from vapor with 89% zinc content and 82% of particles under 63 microns per sieve analysis. This product qualifies as zinc dust under Chapter 79 because it meets the subheading note criteria of at least 80% of particles passing a 63 μm sieve and contains at least 85% metallic zinc.
7903.10.00Battery Manufacturing Zinc Dust
Specialty zinc dust for alkaline battery electrode preparation, vapor-condensed with 87% zinc and a particle distribution ensuring 80% passage through a 63-micron sieve. This product meets the Chapter 79 subheading note definition of zinc dust, which requires at least 80% of particles to pass through a 63 μm sieve and at least 85% metallic zinc content.
7903.10.00Catalyst Activation Zinc Dust
Reactive zinc dust for activating hydrogenation catalysts in pharmaceutical and chemical synthesis, vapor-condensed with particles under 10 μm spheres and 96% metallic zinc. This product meets the Chapter 79 subheading note definition of zinc dust, requiring at least 80% of particles to pass through a 63 μm sieve and at least 85% metallic zinc content.
7903.10.00Cosmetics Micronized Zinc Dust
Pharmaceutical-cosmetic grade zinc dust, vapor condensed with spheres averaging under 20 microns (99% under 63 μm) and 98% pure metallic zinc, used for pigment-free cosmetics. This product qualifies as zinc dust under Chapter 79 because it meets the subheading note criteria of at least 80% of particles passing a 63 μm sieve and contains at least 85% metallic zinc.
7903.10.00Electronics Sintering Zinc Dust
High-fineness zinc dust from vapor process with 86% metallic zinc and spherical particles averaging 10-20 microns (all passing a 63-micron sieve), used in electronics for sintering conductive pastes. This product meets the Chapter 79 subheading note definition of zinc dust, requiring at least 80% of particles to pass through a 63 μm sieve and at least 85% metallic zinc content.
7903.10.00Flame Retardant Zinc Dust Filler
Zinc dust acting as a synergist in intumescent flame retardants for polymers, vapor-produced with 85% minimum zinc and 80% of particles through a 63-micron mesh. This product qualifies as zinc dust under Chapter 79 because it meets the subheading note criteria of at least 80% of particles passing a 63 μm sieve and contains at least 85% metallic zinc.
7903.10.00Galvanizing Flux Zinc Dust
Fine zinc dust for hot-dip galvanizing flux formulations, condensed vapor particles all under 50 microns with 90% metallic zinc content. This product meets the Chapter 79 subheading note definition of zinc dust, which requires at least 80% of particles to pass through a 63 μm sieve and at least 85% metallic zinc content.
7903.10.00Metallurgical Grade Zinc Dust
Spherical zinc dust from vapor condensation with 90%+ metallic zinc purity and particle size predominantly under 63 microns, applied in metallurgy for alloying and surface coating. This product qualifies as zinc dust under Chapter 79 because it meets the subheading note criteria of at least 80% of particles passing a 63 μm sieve and contains at least 85% metallic zinc.
7903.10.00Paint Grade Zinc Dust
Fine spherical zinc dust from zinc vapor condensation with 92% metallic zinc and 90% of particles below 63 microns, essential for anti-corrosive primers and metallic paints. This product meets the Chapter 79 subheading note definition of zinc dust, requiring at least 80% of particles to pass through a 63 μm sieve and at least 85% metallic zinc content.
7903.10.00Pharmaceutical Zinc Dust USP Grade
Ultra-pure zinc dust meeting USP standards, produced via vapor condensation with over 97% metallic zinc and 80%+ of particles through a 63-micron sieve, used in pharmaceutical ointments and topical preparations. This product qualifies as zinc dust under Chapter 79 because it meets the subheading note criteria of at least 80% of particles passing a 63 μm sieve and contains at least 85% metallic zinc.
7903.10.00Pyrotechnic Zinc Dust
Reactive zinc dust from zinc vapor with ultra-fine spherical particles (95% under 63 μm) and 93% metallic zinc, used in pyrotechnics for flash effects and fuels. This product meets the Chapter 79 subheading note definition of zinc dust, requiring at least 80% of particles to pass through a 63 μm sieve and at least 85% metallic zinc content.
7903.10.00Surface Treatment Zinc Dust
Fine zinc dust for metal surface passivation and galvanizing activation, featuring vapor-condensed spherical particles (85% under 63 μm) and 91% metallic zinc purity. This product qualifies as zinc dust under Chapter 79 because it meets the subheading note criteria of at least 80% of particles passing a 63 μm sieve and contains at least 85% metallic zinc.
7903.10.00Zinc Dust for Chemical Precipitations
Ultra-fine zinc dust condensed from vapor with spherical particles where 85% pass a 63-micron mesh and containing 88% metallic zinc, used in chemical reactions for precipitating metals from solutions. This product meets the Chapter 79 subheading note definition of zinc dust, requiring at least 80% of particles to pass through a 63 μm sieve and at least 85% metallic zinc content.
7903.10.00Zinc Dust for Rubber Vulcanization
High-purity zinc dust produced by condensation of zinc vapor, featuring spherical particles finer than 63 microns, used as an activator in rubber vulcanization processes. This product meets the Chapter 79 subheading note definition of zinc dust, requiring at least 80% of particles to pass through a 63 μm sieve and at least 85% metallic zinc content.
7903.90.00Atomized Zinc Powder for Paints
Atomized zinc powder, produced by atomizing molten zinc, is a fine metallic powder used primarily as an anti-corrosion pigment in zinc-rich primers and industrial coatings. It qualifies as a zinc powder under tariff item 7903.90.00, which covers zinc powders other than dust, and is distinct from zinc dust obtained by vapor condensation.
7903.90.00Galvanizing Zinc Dust Recovery Powder
Recovered zinc powder from galvanizing kettle dross is processed to meet powder specifications and used in powder coating applications. It is classified as a zinc powder under tariff item 7903.90.00, as it is not vapor-condensed dust and meets the definition of powders in the chapter notes.
7903.90.00High-Purity Zinc Dust for Paint Pigments
High-purity spherical zinc dust from vapor condensation, used in anti-corrosive paint formulations due to its fine particle size. It meets the chapter definition of zinc dust and is classified under tariff item 7903.90.00 as other zinc dust, since it is not covered by a more specific tariff item.
7903.90.00High-Purity Zinc Powder for Batteries
High-purity zinc powder with over 99% zinc content, used as an anode material in alkaline batteries. It is a zinc powder under tariff item 7903.90.00, distinct from zinc dust, and is not excluded by the section notes since it is not an article of Section XVI.
7903.90.00Industrial Zinc Dust for Chemical Synthesis
High-grade zinc dust with 90%+ metallic content and fine particle distribution, used as a reducing agent in organic synthesis. It meets the chapter definition of zinc dust and is classified under tariff item 7903.90.00 as other zinc dust, since it is not covered by a more specific tariff item.
7903.90.00Metallic Zinc Dust for Pyrotechnics
Fine spherical zinc dust from zinc vapor condensation, containing at least 85% metallic zinc, used in pyrotechnic compositions. It meets the chapter definition of zinc dust and is classified under tariff item 7903.90.00 as other zinc dust, since it is not covered by a more specific tariff item.
7903.90.00Microfine Zinc Powder for 3D Printing
Microfine spherical zinc powder with a particle size of 15-45 microns, optimized for metal 3D printing and additive manufacturing. It is classified as a zinc powder under tariff item 7903.90.00, as it is not vapor-condensed dust and meets the powder definition in the chapter notes.
7903.90.00Spherical Zinc Dust for Diamond Polishing
Ultra-fine spherical zinc dust produced by vapor condensation, with over 90% of particles passing a 63-micron sieve and 97% metallic zinc content. It meets the chapter definition of zinc dust and is classified under tariff item 7903.90.00 as 'other' zinc dust, since it is not covered by a more specific item.
7903.90.00Zinc Dust for Diamond Polishing Compounds
Ultra-fine zinc dust meeting chapter note (c) specifications, used as a binder in diamond polishing slurries. It is classified under tariff item 7903.90.00 as other zinc dust, since it is not covered by a more specific tariff item.
7903.90.00Zinc Dust for Pyrotechnics
Specialty zinc dust with controlled particle size for pyrotechnic compositions, produced by vapor condensation and meeting the chapter definition of zinc dust. It is classified under tariff item 7903.90.00 as other zinc dust, as it is not covered by a more specific tariff item.
7903.90.00Zinc Dust for Rubber Vulcanization
Fine zinc dust used as an activator in rubber vulcanization, meeting the chapter definition of zinc dust with at least 85% metallic zinc and fine particle size. It is classified under tariff item 7903.90.00 as other zinc dust, since it is not covered by a more specific tariff item.
7903.90.00Zinc Flake Powder for Brake Linings
Zinc powder in flake form used as a friction modifier in automotive brake linings. It is classified as a zinc powder under tariff item 7903.90.00, distinct from zinc dust due to its flake morphology, and is not excluded by the section notes.
7903.90.00Zinc Powder for Catalyst Manufacturing
High surface area zinc powder used as a precursor in heterogeneous catalyst production. It is classified as a zinc powder under tariff item 7903.90.00, as it is not vapor-condensed dust and meets the powder definition in the chapter notes.
7903.90.00Zinc Powder for Sintered Bronze Bearings
Fine zinc powder blended with copper for producing sintered bronze bearings, imported as a pure zinc powder component. It is classified as a zinc powder under tariff item 7903.90.00, as it is not vapor-condensed dust and meets the powder definition.