Chapter 2849 — Customs Tariff Headings

Calcium Carbide Granules 25-50mm

Granular calcium carbide sized 25-50mm, optimized for controlled acetylene release in portable generators and welding applications. This product is a separate chemically defined compound of calcium and carbon, falling under tariff item 2849.10.00 as a carbide of calcium.

Calcium Carbide Lumps

Calcium carbide lumps (CaC2) are irregular chunks produced by reacting calcium oxide with carbon in an electric arc furnace, used primarily as a raw material for acetylene gas generation. This product is a separate chemically defined compound of calcium and carbon, classifiable under tariff item 2849.10.00.

Calcium Carbide Powder 200 Mesh

Ultra-fine 200 mesh calcium carbide powder for chemical research and micro-scale acetylene generation. This product is a separate chemically defined compound of calcium and carbon, classifiable under tariff item 2849.10.00 regardless of particle size.

High-Purity Calcium Carbide 98%

High-purity calcium carbide at 98% CaC2 content, used in specialty chemical synthesis and laboratory acetylene production. This chemically defined compound of calcium is specifically covered by tariff item 2849.10.00.

Industrial Calcium Carbide Briquettes

Calcium carbide formed into dense briquettes for efficient storage and transport in steelmaking and carbide lamp applications. This product is a separate chemically defined compound of calcium and carbon, classifiable under tariff item 2849.10.00.

Technical Grade Calcium Carbide 85%

Technical grade calcium carbide with 85% minimum CaC2 purity for cost-effective acetylene production in developing markets. This product is a separate chemically defined compound of calcium and carbon, classifiable under tariff item 2849.10.00.

Black Silicon Carbide Crude Chunks

Black crude silicon carbide chunks from the Acheson furnace process, with irregular shapes and over 97% SiC content. These are unrefined, chemically defined silicon carbide, falling squarely under tariff item 2849.20.00 for carbides of silicon.

Black Silicon Carbide Grain 16/30 Mesh for Steel Deoxidation

Black silicon carbide grains sized 16/30 mesh, used in steelmaking for deoxidation and slag conditioning. These ground grains are refined silicon carbide, classifiable under tariff item 2849.20.00.

Crude Silicon Carbide (SiC) Lumps

Crude silicon carbide lumps produced by high-temperature reaction of silica sand and carbon, used mainly as abrasive raw material. These unrefined lumps are chemically defined silicon carbide, classifiable under tariff item 2849.20.00.

Ferrosilicon Carbide Crude Briquettes

Crude ferrosilicon carbide briquettes from smelting, containing silicon carbide with iron impurities. These are crude silicon carbide forms, classifiable under tariff item 2849.20.00 as carbides of silicon, despite iron content.

Ferro-Silicon Carbide Grain 24/48 Mesh

Ferro-silicon carbide in granular form with 24/48 mesh, chemically defined as silicon carbide with iron additives, used as abrasive and deoxidizer. These grains are refined silicon carbide, fitting tariff item 2849.20.00.

Green Silicon Carbide Crude Nuggets

Green silicon carbide crude nuggets made with petroleum coke, offering higher purity for specialty uses. These unrefined nuggets are chemically defined silicon carbide, fitting tariff item 2849.20.00.

Green Silicon Carbide Micronized Powder 1200 Mesh

Green silicon carbide micronized to 1200 mesh, produced via Acheson process with higher purity, ideal for bonded abrasives and refractories. This pulverized form is refined silicon carbide, classifiable under tariff item 2849.20.00.

High Purity SiC Powder for Sintered Ceramics

High purity alpha silicon carbide powder for pressureless sintering into advanced ceramics. This pulverized, chemically defined silicon carbide is refined for technical ceramics, falling under tariff item 2849.20.00.

Metallurgical Grade Crude SiC Lumps

Metallurgical grade crude silicon carbide lumps with 85-90% SiC, used for recarburizing in steel production. These crude lumps are chemically defined silicon carbide, classifiable under tariff item 2849.20.00.

Recrystallized Silicon Carbide Powder 500 Mesh

Recrystallized silicon carbide powder at 500 mesh for specialty refractories and kiln furniture. This pulverized, chemically defined silicon carbide is refined through high-temperature purification, classifiable under tariff item 2849.20.00.

SiC 1200F Fine Powder for Wire Sawing

SiC 1200F fine powder optimized for slurry in diamond wire sawing of silicon wafers. This refined, pulverized silicon carbide has high friability for cutting applications, fitting tariff item 2849.20.00.

SiC Abrasive Grain 80 Grit Ground

Silicon carbide abrasive grains at 80 grit, ground for use in resinoid grinding wheels and coated abrasives. These refined, ground grains are chemically defined silicon carbide, classifiable under tariff item 2849.20.00.

Silicon Carbide Crude Furnace Tap

Direct furnace-tapped crude silicon carbide in molten-poured lump form, unrefined with impurities. This crude form is chemically defined silicon carbide, falling under tariff item 2849.20.00.

Silicon Carbide Desulfurizer Grain 10-40mm

Silicon carbide grains sized 10-40mm used as desulfurizer in molten iron treatment. These ground or refined silicon carbide grains are chemically defined, falling under tariff item 2849.20.00.

Silicon Carbide Fused Powder 325 Mesh Refractory Grade

Fused silicon carbide powder at 325 mesh, designed for high-temperature refractory brick production. This pulverized, refined form is chemically defined silicon carbide, classifiable under tariff item 2849.20.00.

Silicon Carbide Powder 600 Grit FFP

This is a high-purity silicon carbide (SiC) powder, graded at 600 grit, used for precision lapping and polishing of optical components, ceramics, and metals. As a chemically defined compound of silicon and carbon, it falls squarely under tariff item 2849.20.00 for carbides of silicon, whether or not chemically defined. The product is not mixed with binders or other materials that would remove it from this heading.

Amorphous Boron Carbide Granules 10-50 Micron

Amorphous boron carbide granules in the 10-50 micron range, used as a metallurgical additive and ceramic raw material. This chemically defined boron carbide compound is classified under tariff item 2849.90.00 as a carbide, whether or not chemically defined, other than those specified elsewhere.

Boron Carbide Abrasive Grit

Boron carbide (B4C) grit used in high-performance abrasives and armor materials. Classified under tariff item 2849.90.00 as other chemically defined carbides, excluding metal-sintered cermets, ideal for nozzle linings and cutting.

Boron Carbide Abrasive Micro-Powder F220

F220 grit boron carbide micro-powder standardized for precision lapping and polishing of semiconductors and optics. This chemically defined boron carbide powder is classified under tariff item 2849.90.00 as a carbide, whether or not chemically defined, in powder form.

Boron Carbide Powder B4C 99% Purity

High-purity boron carbide powder with 99% purity, used as an abrasive in polishing and grinding. This chemically defined inorganic compound of boron is classified under tariff item 2849.90.00 as a carbide, whether or not chemically defined.

Boron Carbide Sputtering Target Material

High-density boron carbide material prepared for thin-film deposition via sputtering in semiconductor manufacturing. This chemically defined boron carbide in raw target form is classified under tariff item 2849.90.00 as a carbide, whether or not chemically defined.

Chromium Carbide Additive for Cermets

Granular chromium carbide (Cr3C2) in the 10-50 micron range, specifically for mixing into cermet powder formulations for powder metallurgy. This chemically defined chromium carbide is classified under tariff item 2849.90.00 as a carbide, whether or not chemically defined.

Chromium Carbide Powder

Chromium carbide (Cr3C2) powder applied in thermal spray coatings for corrosion resistance. Classified under tariff item 2849.90.00 for chemically defined carbides excluding those sintered with metals, used in aerospace and petrochemical industries.

Chromium Carbide Powder (Cr3C2)

High-purity chromium carbide (Cr3C2) powder used in thermal spray coatings for wear-resistant surfaces. This chemically defined inorganic compound of chromium is classified under tariff item 2849.90.00 as a carbide, whether or not chemically defined.

Chromium Carbide Sputtering Target

Dense chromium carbide (Cr3C2) disc used as a sputtering target for thin-film deposition. This chemically defined chromium carbide in unwrought form is classified under tariff item 2849.90.00 as a carbide, whether or not chemically defined.

Chromium Carbide Thermal Spray Wire

Continuous wire form of chromium carbide composite (60% Cr3C2 in nickel-chromium matrix) for HVOF thermal spraying. The primary chromium carbide component qualifies it under tariff item 2849.90.00 as a carbide, whether or not chemically defined.

Chromium Carbide Wear Plates

Pre-formed plates consisting primarily of chromium carbide overlay on steel backing for chute liners and conveyor wear parts. The functional chromium carbide layer determines classification under tariff item 2849.90.00 as a carbide, whether or not chemically defined.

Cr3C2 Chromium Carbide Rods

Hot-pressed polycrystalline chromium carbide (Cr3C2) rods used as stock material for machining into pump seals and valve components. This chemically defined carbide in cylindrical form is classified under tariff item 2849.90.00 as a carbide, whether or not chemically defined.

Hafnium Carbide Powder

Hafnium carbide (HfC) ultra-high temperature ceramic powder for rocket nozzles. Falls under tariff item 2849.90.00 as chemically defined carbide, with melting point exceeding 3900°C.

High-Purity Boron Carbide for Nuclear Applications

Ultra-high purity boron carbide specifically for neutron absorption in nuclear reactors. This chemically defined boron carbide compound is classified under tariff item 2849.90.00 as a carbide, whether or not chemically defined, distinguished by isotopic purity.

High-Purity Chromium Carbide Crystals

Synthetic single-crystal chromium carbide (Cr3C2) grown for research and calibration standards in materials science. This chemically defined compound is classified under tariff item 2849.90.00 as a carbide, whether or not chemically defined.

Molybdenum Carbide Catalyst

Molybdenum carbide (Mo2C) nanoparticles used as hydrotreating catalysts in refineries. Falls under tariff item 2849.90.00 as chemically defined carbide for chemical process applications, with high stability under harsh reaction conditions.

Nano-Chromium Carbide Particles

Ultrafine nanocrystalline chromium carbide (Cr3C2) particles averaging 50nm for advanced composite materials and catalysts. This pure, chemically defined compound is classified under tariff item 2849.90.00 as a carbide, whether or not chemically defined.

Niobium Carbide Powder

Niobium carbide (NbC) powder strengthening superalloys for jet engines. Classified under tariff item 2849.90.00 for chemically defined form excluding alloys, critical for high-temperature structural integrity.

Reaction-Bonded Boron Carbide Precursor Powder

Specialty boron carbide powder designed for reaction-bonded ceramic processing in armor and wear-resistant applications. This pure chemical compound prior to sintering is classified under tariff item 2849.90.00 as a carbide, whether or not chemically defined.

Silicon Carbide Powder

High-purity silicon carbide (SiC) powder used in abrasives, refractories, and ceramics production. It is a chemically defined carbide of a non-metal, classifiable under this tariff item as a carbide, whether or not chemically defined, and not in sintered form with metal.

Tantalum Carbide Powder

Tantalum carbide (TaC) powder for electronics and cutting tools, chemically pure and not combined with metals. It is a chemically defined carbide of a metal, classifiable under this tariff item as a carbide, whether or not chemically defined, with high corrosion resistance.

Titanium Carbide Powder

Titanium carbide (TiC) powder for cermet production and wear-resistant parts, chemically pure and before sintering with metals. It is a chemically defined carbide of a metal, classifiable under this tariff item as a carbide, whether or not chemically defined, offering a high melting point for extreme environments.

Tungsten Carbide Balls

Precision-ground tungsten carbide spheres used in bearings, valves, gauging, and grinding media. These sintered, unmounted carbide balls are classified as tungsten carbide in unworked form before final polishing, falling under tariff item 2849.90.00 for other carbides.

Tungsten Carbide Buttons for Rock Drilling

Hemispherical tungsten carbide buttons inserted into drill bits for mining and rock drilling. These sintered, unmounted carbide pieces provide extreme hardness for penetrating hard rock and are classified under tariff item 2849.90.00 as other carbides.

Tungsten Carbide Gauge Blanks

Sintered tungsten carbide blanks used for plug and thread gauges in metrology. These unwrought carbide forms ensure dimensional accuracy in manufacturing and are classified under tariff item 2849.90.00 as other carbides.

Tungsten Carbide Insert Blanks

Pressed and sintered tungsten carbide blanks for turning and milling inserts, chemically defined WC compound. These unwrought carbide shapes are used in CNC machining for metal cutting and fall under tariff item 2849.90.00 before final grinding.

Tungsten Carbide Nozzles

Sintered tungsten carbide nozzles for sandblasting and waterjet cutting, chemically defined carbide. These unworked forms before final threading offer high wear resistance for abrasive flows and are classified under tariff item 2849.90.00.

Tungsten Carbide Powder

Fine powder composed of tungsten carbide (WC), a chemically defined compound used primarily in manufacturing cutting tools and wear-resistant parts. It falls under tariff item 2849.90.00 as a carbide of tungsten.

Tungsten Carbide Rod Blanks

Unmachined cylindrical rods made from sintered tungsten carbide, used as blanks for drills and end mills. Classified under tariff item 2849.90.00 as tungsten carbides in unworked form, per chapter exclusions for worked shapes.

Tungsten Carbide Seal Rings

Sintered tungsten carbide rings used in mechanical seals for pumps and valves. These basic carbide shapes, chemically defined, offer corrosion and wear resistance and fall under tariff item 2849.90.00.

Tungsten Carbide Wear Plates

Flat sintered plates of tungsten carbide for lining crushers and chutes against abrasion. Covered by tariff item 2849.90.00 as tungsten carbides in basic shapes, not advanced workings, essential for mining equipment durability.

Tungsten Carbide Wire Drawing Dies

Cylindrical sintered tungsten carbide dies with central hole for wire drawing processes. Classified under tariff item 2849.90.00 as unwrought carbide shapes, used in metal wire production lines.

Ultra-Fine Boron Carbide Nanopowder <500nm

Nanoscale boron carbide powder with average particle size less than 500nm for advanced composites and coatings. This chemically defined boron carbide nanomaterial is classified under tariff item 2849.90.00 as a carbide, whether or not chemically defined.