Chapter 2529 — Customs Tariff Headings

Ceramic Grade Feldspar

Ceramic grade feldspar is a naturally occurring mineral that has been crushed, ground, and graded for use in ceramics, with low iron content to prevent discoloration in tiles and sanitaryware. It is processed only by mechanical means, such as crushing and grinding, which does not alter its chemical structure, and it is not mixed with other substances. This places it squarely under tariff item 2529.10.00 as feldspar in its crude or mechanically processed state.

Glass Grade Feldspar Powder

Glass grade feldspar powder is natural feldspar that has been finely milled to a uniform particle size for use in soda-lime glass production. The milling process is a mechanical physical process that does not change the mineral's structure, and the powder is not chemically synthesized or mixed with other materials. Therefore, it qualifies as feldspar under tariff item 2529.10.00.

Potassium Feldspar Powder

Potassium feldspar powder, also known as orthoclase, is a naturally occurring rock-forming mineral that is mined and ground into a fine powder for use as a flux in ceramic glazes and porcelain production. The grinding is a mechanical process that does not alter the mineral's chemical structure, and the product is not mixed with other materials. This makes it classifiable as feldspar under tariff item 2529.10.00.

Sodium Feldspar Lumps

Sodium feldspar lumps, also known as albite, are extracted from pegmatite deposits and are used in glass manufacturing as a source of alumina and silica. The lumps are in their natural state, having undergone only extraction and possibly simple washing or crushing, which are permitted processes under the chapter notes. As raw feldspar, this product falls under tariff item 2529.10.00.

Acid Grade Fluorspar Lump

Acid grade fluorspar in lump form, containing approximately 97% calcium fluoride by weight. This natural mineral is used primarily in the production of hydrofluoric acid for industrial chemical processes, and its calcium fluoride content does not exceed 97%, placing it under this tariff item.

Ceramic Fluorspar Powder

Ground fluorspar powder with a calcium fluoride content of 96% by weight, used in ceramic glazes and enamels to improve fluidity. The product is natural fluorspar that has been ground, and its CaF2 content is at or below 97%, making it classifiable under this tariff item.

Fluorspar Briquettes Low Grade

Compressed low-grade fluorspar briquettes containing 94% calcium fluoride, formed for easier handling in aluminum smelting. The briquettes are agglomerated fluorspar not further worked, and the CaF2 content is below 97%, so they are classified under this tariff item.

Fluorspar Gravel 95% CaF2

Natural fluorspar gravel screened to 3-10mm with 95% calcium fluoride content, used as a flux in phosphate fertilizer production. The product is in granular crude form, and its CaF2 content is below 97%, making it classifiable under this tariff item.

Metallurgical Grade Fluorspar Fines

Crushed fluorspar fines with a calcium fluoride content of 95-97%, used as a fluxing agent in steelmaking to lower melting points. The product is low-grade fluorspar in powder or chunk form, and its CaF2 content does not exceed 97%, placing it under this tariff item.

Raw Fluorspar Chips for HF Production

Chipped fluorspar with a calcium fluoride content of 92-96%, sized 10-50mm for feeding into hydrofluoric acid reactors. This raw material is natural fluorspar in chip form, and its CaF2 concentration is below 97%, making it classifiable under this tariff item.

Acid Grade Fluorspar Lump

Acid grade fluorspar lumps mined and crushed to contain over 97% calcium fluoride, used primarily as feedstock for hydrofluoric acid production. The product is in a crude state, having only been crushed and screened, with no chemical alteration or heat treatment, aligning with Chapter 25's coverage of natural mineral products.

Aluminum Reduction Fluorspar Briquettes

Fluorspar briquettes formed by agglomeration of high-purity fluorspar (>97% CaF2) for use in aluminum electrolysis cells. The briquetting process is a mechanical or physical process that does not change the mineral's structure, and the product remains within Chapter 25's scope as a natural mineral product.

Ceramic Flux Fluorspar Granules

Granulated fluorspar with over 97% calcium fluoride content, used as a flux in ceramic tile production. The granules are produced by crushing and sieving natural fluorspar, a mechanical process permitted under Chapter 25, and the product is not roasted, calcined, or mixed.

Chemical Grade Fluorspar 98%

Premium chemical-grade fluorspar with a calcium fluoride content of 98% or higher, intended for fluorine compound synthesis. The product is in a crude or minimally processed state, having only been crushed and sorted, and meets the purity threshold of tariff item 2529.22.00.

Glass Manufacturing Fluorspar

Fine-ground fluorspar powder containing more than 97% calcium fluoride, used as a flux and opacifier in glass manufacturing. The powder is produced by grinding natural fluorspar, a mechanical process allowed under Chapter 25, and the product is not chemically modified.

High-Purity Fluorspar Chips

Chipped fluorspar pieces exceeding 97% calcium fluoride by weight, used as a flux in aluminum smelting. The product is in a crude state, having been chipped and screened from natural mineral deposits, with no further processing beyond mechanical size reduction.

Hydrofluoric Acid Feedstock Fluorspar

Lump fluorspar exceeding 97% CaF2, specifically graded for hydrofluoric acid synthesis. The product is mined and crushed, remaining in a crude state without any chemical or thermal treatment, and meets the high-purity criterion of tariff item 2529.22.00.

Metallurgical Grade Fluorspar Powder

Finely ground fluorspar powder with over 97% CaF2 content, used as a flux in steelmaking to lower melting points. The powder is obtained by grinding natural fluorspar, a mechanical process permitted under Chapter 25, and contains no added substances beyond an anti-dusting agent.

Optical Grade Fluorspar Crystals

Natural fluorspar crystals selected for over 97% CaF2 purity, used in lens manufacturing and spectroscopy. The crystals are in a crude state, not worked or polished, and are not optical elements, so they fall within Chapter 25's coverage of natural mineral products.

Steel Flux High-Purity Fluorspar

Crushed fluorspar chunks with over 97% CaF2 content, used as a slag former in electric arc furnaces. The product is in a crude state, having been crushed from natural mineral deposits, with no chemical or thermal processing, and meets the purity threshold of tariff item 2529.22.00.

AF Sodalite Nepheline Syenite

AF-grade nepheline syenite containing sodalite inclusions, used in low-expansion glass-ceramics. This natural mineral product is distinguished by inclusion analysis and falls under this tariff item as a natural form of nepheline syenite, consistent with Chapter 25 notes.

Canadian Blue Earth Nepheline Syenite

Blue Earth deposit nepheline syenite from Ontario, known for consistent alumina content in ceramics. This pure mineral import is in a crude or physically processed state, consistent with Chapter 25 notes, and falls under this tariff item as natural nepheline syenite.

Feldspar-Nepheline Syenite Blend

A natural blend of nepheline syenite and feldspar, with a dominant nepheline syenite content (30-70% nepheline), used in sanitaryware and electrical porcelain production. The product is in a crude or physically processed state, consistent with Chapter 25 notes, and is classified under this tariff item due to its primary nepheline syenite characteristics.

Fine Ground Nepheline Syenite 10 Micron

Fine ground nepheline syenite with a 10 micron D50, used for high-end coatings and adhesives. The ultra-fine grind is a physical process allowed under Chapter 25 notes, and the product retains its natural mineral status, falling under this tariff item.

Ground Nepheline Syenite Powder

Finely ground nepheline syenite powder derived from igneous rock deposits, primarily composed of nepheline, albite, and microcline feldspar. The product is ground, a physical process allowed under Chapter 25 notes, and falls under this tariff item as a natural mineral.

K1-K Feldspar Nepheline Syenite

Premium K-feldspar rich nepheline syenite from Canadian deposits, ground to 325 mesh for glass manufacturing. The product is ground, a physical process allowed under Chapter 25 notes, and falls under this tariff item as a natural leucite-nepheline rock.

Leucite Crystals for Research

Hand-selected leucite crystals from volcanic deposits, used in geological research and as reference standards in mineralogy labs. These unworked natural leucite specimens, each weighing under 2.5 g, fall under this tariff item as crude leucite, consistent with Chapter 25 notes.

Leucite Ore Concentrate

Concentrated leucite ore extracted from volcanic deposits, used in specialty ceramics and as a potassium source in fertilizers. The product is concentrated by physical processes such as flotation or magnetic separation, which are permitted under Chapter 25 notes, and remains classified as leucite under this tariff item.

Leucite Sand Substitute

Screened leucite particles (0.1-2mm) used as a foundry sand substitute in metal casting molds due to high thermal stability. The product is sized by screening, a physical process allowed under Chapter 25 notes, and is classified as leucite under this tariff item.

Micronized Nepheline Syenite Filler

Ultra-fine (<10 micron) nepheline syenite powder used as a functional filler in paints, coatings, and plastics. The product is ground, a physical process permitted under Chapter 25 notes, and retains its natural mineral status, falling under this tariff item as nepheline syenite.

Nepheline Syenite Ceramic Filler

Coarse-ground nepheline syenite specifically graded for ceramic tile and sanitaryware production, providing fluxing properties and whiteness. The product is ground, a physical process allowed under Chapter 25 notes, and falls under this tariff item as unprocessed nepheline syenite.

Nepheline Syenite Ceramic Flux

Pre-crushed nepheline syenite (100-325 mesh) formulated for tile body and glaze fluxing in ceramic manufacturing. The product is crushed and screened, physical processes allowed under Chapter 25 notes, and is classified under this tariff item as a natural mineral before any formulation mixing.

Nepheline Syenite for Glass Batch

Coarse-ground nepheline syenite specifically graded for container glass and flat glass production as a primary source of alkalis and alumina. The product is ground, a physical process allowed under Chapter 25 notes, and is classified under this tariff item as a natural mineral flux.

Nepheline Syenite Lumps

Coarse lumps of nepheline syenite rock, typically 2-10 cm, mined for crushing into flux material for porcelain and tile production. The product is in a crude, unworked state, consistent with Chapter 25 notes, and falls under this tariff item as natural nepheline syenite.