Other
Feldspar; leucite, nepheline and nepheline syenite; fluorspar: > Leucite; nepheline and nepheline syenite > Other
Duty Rate (from China)
Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
Products classified under HTS 2529.30.00.50
Nepheline Syenite Powder
Finely ground nepheline syenite used as a functional filler in ceramic tile production and glass manufacturing. Classified under HTS 2529.30.0050 as 'other' leucite, nepheline and nepheline syenite that is processed into powder form but remains a natural mineral product. It provides fluxing properties and improves whiteness in end products.
Leucite Ore Concentrate
Concentrated leucite mineral extracted from volcanic rock deposits, used primarily in potassium fertilizer production and ceramics. Falls under HTS 2529.30.0050 as 'other' leucite not in crude form. The concentrate maintains natural mineral composition without synthetic additives.
Ground Nepheline Syenite Filler
Micronized nepheline syenite specifically graded for paint and coating applications as an extender pigment. HTS 2529.30.0050 covers this 'other' form of nepheline syenite processed by grinding but not chemically altered. Provides matting effect and abrasion resistance.
Nepheline Syenite Ceramic Flux
Calcined nepheline syenite flux for porcelain and sanitary ware production, providing alkali metal oxides for vitrification. Classified HTS 2529.30.0050 as 'other' nepheline syenite despite heat treatment, remaining a natural mineral product. Typical Na2O 9-11%, Al2O3 22-24%.
Leucite Ceramic Raw Material
Natural leucite crystals separated for specialty glass-ceramics like cooktop panels and dental porcelains. HTS 2529.30.0050 'other' covers beneficiated leucite maintaining crystalline structure. Provides nucleation sites for controlled crystallization.
Nepheline Syenite Glass Batch Additive
Granulated nepheline syenite for container glass and flat glass production, replacing soda ash and feldspar. HTS 2529.30.0050 classification as 'other' nepheline syenite in prepared batch form. Standardized 0.5-3mm granules optimize melting efficiency.
Milled Leucite for Porcelain
Ultra-fine milled leucite (<10 micron D50) for high-strength dental porcelain and technical ceramics. Remains HTS 2529.30.0050 'other' as physical milling doesn't alter mineralogy. Enhances translucency and strength in final frits.
Beneficiated Nepheline Concentrate
Flotation beneficiated nepheline concentrate >95% purity for premium glass and ceramic applications. HTS 2529.30.0050 'other' nepheline syenite after physical separation processes. Low iron content (<0.3% Fe2O3) ensures color stability.
Nepheline Syenite Paint Extender
Delaminated nepheline syenite platelets for matte architectural paints and plasters. Physical delamination creates platy structure improving hiding power. HTS 2529.30.0050 as 'other' processed nepheline syenite.
Leucite Flux for Sanitary Ware
Selected leucite-rich fraction for vitreous china sanitary ware bodies, improving strength and whiteness. Classified HTS 2529.30.0050 'other' leucite specifically prepared for ceramic fluxing. K2O content 15-18% provides essential alkali.
Micronized Nepheline Syenite
D97=10 micron nepheline syenite for injection molding compounds and engineered plastics. Ultra-fine particle size improves flow without sacrificing stiffness. HTS 2529.30.0050 'other' physically processed nepheline.
Nepheline Syenite for Fiberglass
Low-boron nepheline syenite for E-glass fiberglass reinforcement production. Provides stable alumina-silica ratio for fiber durability. HTS 2529.30.0050 'other' nepheline selected for boron <50ppm specification.
Leucite Dental Ceramic Precursor
High-purity leucite powder (99%+) for pressable dental ceramics mimicking natural tooth leucite. Provides opalescent effect and fracture toughness. HTS 2529.30.0050 as mineral precursor despite purity.
Nepheline Syenite Plaster Filler
Coarse nepheline syenite (D50=25µm) for gypsum plasters and joint compounds improving sandability. Replaces diatomaceous earth for better finish. HTS 2529.30.0050 'other' nepheline processed to plaster grade.
Synthetic Zeolite Precursor Nepheline
High-silica nepheline syenite for synthetic zeolite A and X production in detergents. Provides perfect SiO2/Al2O3 for crystallization. HTS 2529.30.0050 mineral precursor despite chemical processing intent.