Potassium Feldspar Powder
Potassium feldspar, also known as orthoclase, is a common rock-forming mineral mined and ground into powder for use as a flux in ceramic glazes and porcelain production. This product falls under HTS 2529.10.00.00 as it is natural feldspar that has been crushed and milled but remains chemically unchanged, classified specifically as feldspar in Chapter 25.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If calcined or heat-treated extensively
Calcined feldspar may qualify as kaolin or similar clays under heading 2507 due to altered physical properties.
If chemically modified or fluxed with additives
Chemically prepared feldspar blends fall under Chapter 38 as chemical products rather than natural minerals.
If when ground specifically for refractory brick production
Feldspar prepared exclusively for refractories may be classified under Chapter 69 as part of finished refractory materials.
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The Tariff Assistant works through the GRI rules on your specific product to reach the right HTS code — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Verify purity and particle size via lab testing to confirm classification as feldspar rather than processed mineral products
• Provide geological origin certificates and mining extraction proof to avoid misclassification as synthetic chemicals
• Ensure bulk packaging complies with dust control regulations for mineral imports to prevent port delays
Related Products under HTS 2529.10.00.00
Sodium Feldspar Lumps
Sodium feldspar (albite) in lump form is extracted from pegmatite deposits and used primarily in glass manufacturing as a source of alumina and silica. Classified under HTS 2529.10.00.00 as raw feldspar, it has undergone minimal processing like crushing to lump size without chemical alteration.
Ceramic Grade Feldspar
High-quality feldspar graded for ceramics, with low iron content to prevent discoloration in tiles and sanitaryware. It is natural feldspar plug for sanitaryware glazes under HTS 2529.10.00.00, as it remains an unprocessed aluminosilicate mineral.
Glass Grade Feldspar Powder
Feldspar finely milled to uniform particle size for soda-lime glass production, providing network formers without further refinement. Falls under HTS 2529.10.00.00 as it's crude feldspar, not chemically synthesized.
Leucite Ore Feldspar
Feldspar extracted from leucite-rich volcanic rocks, used in specialty ceramics requiring high potash flux. Classified as feldspar under HTS 2529.10.00.00 despite leucite association, as primary mineral is feldspar.
Nepheline Syenite Feldspar Blend
Blended feldspar from nepheline syenite deposits, offering low iron and high alkali for paint extenders and ceramics. HTS 2529.10.00.00 applies to the dominant feldspar component in this natural mineral product.