Chapter 8101 — Customs Tariff Headings

Atomized Tungsten Powder

Gas-atomized tungsten powder with controlled spherical morphology, used in powder metallurgy and thermal spraying. It is a powder form of tungsten, not an alloy or article, and therefore falls under tariff item 8101.10.00.

Micron Tungsten Powder 5-10um

Fine 5-10 micron tungsten powder for injection molding of complex parts. This is a tungsten powder product, not an alloy or article, so it is classified under tariff item 8101.10.00.

Nano Tungsten Powder

Nanoparticle tungsten powder (<100nm) for catalysts, batteries, and advanced materials research. As a tungsten powder, it falls under tariff item 8101.10.00 regardless of particle size.

Pure Tungsten Powder 99.9%

High-purity tungsten powder (≥99.9% W) used in metallurgy, electronics, and 3D printing. It is a pure tungsten powder, not an alloy or article, so it falls under tariff item 8101.10.00.

Reduced Tungsten Powder

Hydrogen-reduced tungsten powder from ammonium paratungstate, standard for powder metallurgy parts. This is an intermediate tungsten powder product, falling under tariff item 8101.10.00.

Tungsten Carbide Powder

Tungsten carbide powder, composed primarily of tungsten carbide (WC), used in cutting tools and wear-resistant parts. Although it contains carbon, it is a tungsten powder and falls under tariff item 8101.10.00 as a powder of tungsten.

Tungsten Powder for 3D Printing

Spherical tungsten powder optimized for selective laser melting (SLM) in additive manufacturing of high-density parts. It is a tungsten powder, not an alloy or article, so it falls under tariff item 8101.10.00.

Tungsten Powder for Catalysts

Activated tungsten powder used as a hydrogenation catalyst precursor in the chemical industry. As a pure metal powder, it falls under tariff item 8101.10.00.

Tungsten Powder for Electronics

Ultra-pure tungsten powder for semiconductor contacts and thick-film pastes. With purity >99.999%, it is a tungsten powder and falls under tariff item 8101.10.00.

Tungsten Powder for Lamp Filaments

High-purity, coarse tungsten powder for drawing into lamp filament wire. It is a powder form of tungsten, not yet an article, so it falls under tariff item 8101.10.00.

Tungsten Powder for Welding Electrodes

Lanthanum-doped tungsten powder for TIG welding electrode production. Although doped, it remains a tungsten powder and falls under tariff item 8101.10.00, as it is not a final article.

High-Purity Sintered Tungsten Rod for Thermocouples

High-purity sintered tungsten rods of 99.95% purity, used as raw material for Type C thermocouples in high-temperature furnaces and kilns. These rods are obtained simply by sintering and have not been further worked, qualifying them as unwrought tungsten under tariff item 8101.94.00.

Pure Sintered Tungsten Rod for EDM Electrodes

High-density tungsten rods sintered for use in electrical discharge machining (EDM) electrodes. These rods are obtained simply by sintering and have not been further worked, making them unwrought tungsten under tariff item 8101.94.00.

Sintered Tungsten Bar for Catalyst Substrates

Unwrought sintered tungsten bars used as substrates for chemical reactor catalysts in ammonia synthesis. These bars are obtained simply by sintering and have not been subjected to further processing, making them classifiable as unwrought tungsten under tariff item 8101.94.00.

Sintered Tungsten Bar Stock for Heat Sinks

Unwrought tungsten bars produced by sintering, used as raw stock for heat sinks in electronics and military applications. These bars are obtained simply by sintering and have not been further worked, qualifying them under tariff item 8101.94.00 as unwrought tungsten.

Sintered Tungsten Billet for Armor Penetrators

Large sintered tungsten billets used as raw material for kinetic energy penetrators in military applications. These billets are obtained simply by sintering and have not been further worked, making them unwrought tungsten under tariff item 8101.94.00.

Sintered Tungsten Ingot for X-Ray Shielding

Massive sintered tungsten ingots used as raw material for radiation shielding in medical and industrial X-ray equipment. These ingots are obtained simply by sintering and have not been further worked, qualifying them as unwrought tungsten under tariff item 8101.94.00.

Sintered Tungsten Rod for Lamp Filaments

High-purity tungsten rods produced by powder metallurgy sintering, used in manufacturing incandescent and halogen lamp filaments. These rods are obtained simply by sintering and have not been further worked, qualifying them as unwrought tungsten under tariff item 8101.94.00.

Unwrought Sintered Tungsten Bar for Aerospace Alloys

Pure tungsten bars created through sintering, supplied unwrought for melting into high-temperature aerospace superalloys. These bars are obtained simply by sintering and have not been further worked, making them unwrought tungsten under tariff item 8101.94.00.

Unwrought Tungsten Sintered Rod for Rocket Nozzles

Sintered tungsten rods machined into throats for solid rocket motor nozzles. The input material is unwrought sintered tungsten, qualifying under tariff item 8101.94.00 as unwrought tungsten before further machining.

Unwrought Tungsten Sintered Rod for Welding Electrodes

Sintered pure tungsten rods serving as base material for thoriated or lanthanated TIG welding electrodes. These rods are obtained simply by sintering and have not been doped or further worked, qualifying them as unwrought tungsten under tariff item 8101.94.00.

Pure Tungsten Lamp Wire

Pure tungsten lamp wire, drawn to 99.95% purity, is used in specialty lighting filaments where high melting point and durability are essential. It qualifies as tungsten wire under tariff item 8101.96.00, being a drawn product of uniform solid cross-section, not further worked into articles.

Tungsten EDM Wire

Tungsten EDM wire is a high-precision, drawn tungsten wire used in electrical discharge machining, valued for its high melting point and electrical conductivity. It falls under tariff item 8101.96.00 as tungsten wire, provided it is not coated or otherwise processed beyond drawing.

Tungsten Filament Wire

Tungsten filament wire is thin, drawn tungsten wire used as filaments in incandescent and halogen lamps. It is classified under tariff item 8101.96.00 as tungsten wire, distinct from rods or bars, and is not yet formed into finished filaments.

Tungsten Heating Element Wire

Tungsten heating element wire is resistive tungsten wire designed for industrial furnace heating coils, capable of operating up to 3000°C. It qualifies as tungsten wire under tariff item 8101.96.00, being a drawn product of uniform cross-section, not yet formed into heating elements.

Tungsten Medical X-Ray Wire

Tungsten medical X-ray wire is high-density tungsten wire used for X-ray tube anodes and targets in medical imaging. It is classified as tungsten wire under tariff item 8101.96.00 before machining into targets or anodes.

Tungsten Microelectronics Wire

Tungsten microelectronics wire is ultra-fine tungsten wire, down to 10μm, used for bonding in semiconductor packaging. It falls under tariff item 8101.96.00 as tungsten wire, provided it is not coated or processed beyond drawing.

Tungsten Thermocouple Wire

Tungsten thermocouple wire is a tungsten-rhenium alloy wire used in Type C thermocouples for high-temperature measurement up to 2300°C. It is classified under tariff item 8101.96.00 as tungsten wire, as tungsten predominates by weight and the alloy is treated as tungsten under section note 5.

Tungsten Welding Wire

Tungsten welding wire is straight or coiled tungsten wire used for TIG welding electrodes, prized for arc stability. It is classified as tungsten wire under tariff item 8101.96.00 before any electrode processing, such as grinding or doping.

Tungsten Alloy Turning Scrap

Machining turnings and borings from high-density tungsten alloy parts used in aerospace and defense. These are waste and scrap of tungsten, as the alloy is predominantly tungsten by weight, and the material is not usable as-is.

Tungsten Carbide Scrap

Discarded tungsten carbide inserts and tooling bits from machining operations. Tungsten carbide is a cermet, but as waste and scrap, it is classified under tungsten waste and scrap, not as a separate article.

Tungsten Crucible Scrap

Broken or worn crucibles from high-temperature metallurgy and semiconductor production. These are tungsten articles that are no longer usable, qualifying as waste and scrap under this tariff item.

Tungsten Electrode Scrap

Discarded tungsten electrodes from TIG welding operations, often with minor wear. These are waste and scrap of tungsten, as they are no longer usable as electrodes.

Tungsten Heat Sink Scrap

Scrap from machined tungsten-copper composite heat sinks for power electronics. If tungsten predominates by weight, this is classified as tungsten waste and scrap.

Tungsten Lamp Filament Scrap

Scrap filaments recovered from spent incandescent and halogen lamps. These are tungsten waste and scrap, not lamp parts, as they are no longer usable.

Tungsten Powder Mill Scale Scrap

Oversized particles and dust collected from tungsten powder milling for metallurgy. Despite the powder-like form, these are treated as waste and scrap under this tariff item.

Tungsten Radiation Shielding Scrap

Discarded high-density tungsten alloy plates from medical imaging and nuclear shielding. These are waste and scrap of tungsten articles, as they are no longer usable.

Tungsten Sheet and Foil Scrap

Trimmings and rejects from tungsten sheet used in electronics and heat shields. These are waste from articles of tungsten, classified under this tariff item.

Tungsten Wire Scrap

Waste tungsten wire trimmings and rejects from electrical filament and lamp manufacturing. These are waste and scrap of tungsten, separate from bars, rods, or profiles.

Tungsten Alloy Bar for Balancing Weights

A dense tungsten alloy bar used for precision balancing in automotive wheels. The bar is not simply sintered and is alloyed, meeting the definitions of bars and rods under Chapter 81 notes.

Tungsten Alloy Plate for Radiation Shielding

A dense tungsten alloy plate used for radiation shielding in medical X-ray rooms. The plate is not simply sintered and is alloyed, fitting the definition of plates under Chapter 81 notes.

Tungsten Alloy Round Bar

A solid cylindrical bar made from tungsten alloy, used in high-temperature aerospace applications. The bar is not obtained by simple sintering and is alloyed, meeting the bar definition under Chapter 81 notes.

Tungsten Anvil for Jewelry Hammering

Compact tungsten anvil blocks for precision metalworking in jewelry fabrication. These are finished articles of tungsten, not covered by other specific headings, and fall under 'other' articles of tungsten.

Tungsten Balance Beam for Gymnastics

High-density tungsten counterweights integrated into gymnastics balance beams for stability. These are finished articles of tungsten, classified as 'other' articles under this tariff item.

Tungsten Carbide Cutting Insert

A precision-engineered insert made from sintered tungsten carbide used in machining tools for cutting metals. It is an 'other' article of tungsten, distinct from unwrought forms, powders, or simple wrought products.

Tungsten Crucible for Lab Melting

Pure tungsten crucibles for high-temperature melting of precious metals in laboratories. These are finished articles of tungsten, classified as 'other' articles under this tariff item.

Tungsten Dart Tip

Precision tungsten tips for steel-tip darts used in pub games. These are finished articles of tungsten, classified as 'other' articles under this tariff item.

Tungsten Foil for Thin-Film Deposition

Ultra-thin tungsten alloy foil (<0.2mm) used for vapor deposition in electronics. The foil is not simply sintered and is alloyed, fitting the definition of foil under Chapter 81 notes.

Tungsten Profile for Furnace Heating Elements

Custom-shaped tungsten alloy profile for vacuum furnace heaters. The profile is not simply sintered and is alloyed, meeting the profile definition under Chapter 81 notes.

Tungsten Rod for X-Ray Targets

High-purity tungsten alloy rod for rotating X-ray tube targets. The rod is not sintered simply and is alloyed, fitting the rod definition under Chapter 81 notes.

Tungsten Sheet for Heat Shields

Thin tungsten alloy sheet used in spacecraft heat shields due to high melting point. The sheet is not simply sintered and is alloyed, meeting the sheet definition under Chapter 81 notes.

Tungsten Sheet for Rocket Nozzles

Refractory tungsten alloy sheet for fabricating rocket engine nozzles. The sheet is not sintered simply and is alloyed, fitting the sheet definition under Chapter 81 notes.

Tungsten Strip for EDM Electrodes

Narrow tungsten alloy strip for electrical discharge machining electrodes. The strip is not simply sintered and is alloyed, meeting the strip definition under Chapter 81 notes.