Pumice stone
Pumice stone; emery; natural corundum, natural garnet and other natural abrasives, whether or not heat-treated. > Pumice stone > Pumice stone
Duty Rate (from China)
Subheadings
Products classified under Tariff item 2513.10.00
Crude Pumice Blocks
Crude pumice blocks are natural volcanic stones cut into rough blocks for carving or further abrasive processing. They retain their natural vesicular texture and are not subjected to any processing beyond cutting, aligning with the crude state requirement of Chapter 25. This tariff item covers pumice stone in its natural or minimally processed form.
Crude Pumice Stone Blocks
Crude pumice stone blocks are large, unprocessed blocks of natural pumice extracted directly from volcanic deposits, remaining in their crude form without further shaping or sizing. They are not heat-treated or subjected to any processing beyond extraction, and fall under this tariff item as crude pumice. The blocks are suitable for further abrasive processing.
Crushed Volcanic Pumice Chunks
Crushed volcanic pumice chunks are irregular pieces of pumice stone crushed during mining but not further refined, sized roughly 5-15 cm. They are ideal for tumbling into lapidary abrasives and are in a crude state, not heat-treated or screened. This tariff item covers crushed pumice stone in its natural state.
Heat-Treated Pumice Gravel
Heat-treated pumice gravel is natural pumice stone that has been thermally processed to enhance durability for use in concrete aggregates and water filtration. While Chapter 25 generally excludes heat-treated products, the heading for pumice stone specifically allows heat treatment. This product retains its natural abrasive properties and falls under this tariff item.
Industrial Pumice Aggregate
Industrial pumice aggregate is coarse pumice stone used for lightweight concrete blocks and precast panels, heat-treated for strength. As a natural abrasive in aggregate form, it falls under this tariff item, which covers pumice stone whether or not heat-treated. The product is not mixed with other materials at importation.
Lava Pumice Stones for Tumbling
Lava pumice stones for tumbling are medium-sized natural pumice stones sourced from lava flows, specifically sized for rock tumbling and lapidary work. They are natural abrasives suitable for hobbyist and industrial polishing, and are not processed beyond sizing. This tariff item covers pumice stone in its natural state.
Lightweight Pumice Horticultural Substrate
Lightweight pumice horticultural substrate consists of expanded pumice granules used as a soilless growing medium for hydroponics and greenhouses. Although used agriculturally, it is still natural pumice stone with abrasive properties, and this tariff item covers pumice stone without restriction on end-use. The product is not mixed with fertilizers or other additives.
Mining Crushed Pumice Fines
Mining crushed pumice fines are coarse fines from pumice quarry crushing operations, with irregular pieces under 5 cm retaining natural porosity. They are not screened or graded for uniformity, remaining in a crude state. This tariff item covers crushed pumice in its natural state, suitable for abrasive feedstock.
Natural Pumice for Stone Washing
Natural pumice for stone washing consists of selected pumice stones used in textile stone-washing processes to achieve distressed denim looks. The stones are natural pumice abrasives with size and porosity optimized for fabric finishing, and are not processed beyond selection. This tariff item covers pumice stone used as an abrasive.
Pumice Abrasive Grit 30/60 Mesh
Pumice abrasive grit in 30/60 mesh is graded natural pumice for sandblasting and surface preparation in metalworking. The grit is produced by crushing and screening natural pumice, which is permitted under Chapter 25 as a mechanical process. This tariff item covers pumice stone in powdered or granular form.
Pumice Filter Media
Pumice filter media is granular pumice stone used in water treatment and aquariums due to its porous structure. The product is natural pumice, and heat-treated variants are still covered by this tariff item, which allows heat treatment. It serves as a natural abrasive and filtering material, falling under this heading.
Raw Italian Pumice Irregular Pieces
Raw Italian pumice irregular pieces are natural pumice from Lipari Island mines, supplied in irregular hand-broken pieces averaging 10-20 cm. They are in crude form for export to abrasive manufacturers, not heat-treated or further processed. This tariff item covers unworked pumice stone.
Raw Pumice Stone Lumps
Raw pumice stone lumps are unprocessed pumice extracted from volcanic deposits, used primarily as a natural abrasive in industrial grinding and polishing. They are in the crude state, not subjected to any processing beyond extraction, and fall under this tariff item. The lumps retain their natural structure and are not heat-treated.
Unscreened Pumice Quarry Run
Unscreened pumice quarry run is a direct-from-quarry mixture of irregular pieces and light crushing, unsorted sizes 2-30 cm for bulk abrasive feedstock. It is in a crude state, not screened or graded, and falls under this tariff item as crude pumice. The product is suitable for further processing into abrasives.
Volcanic Pumice Powder
Volcanic pumice powder is finely ground natural pumice stone used as an abrasive in metal polishing and paint additives. The powder is produced by grinding, which is a mechanical process permitted under Chapter 25. This tariff item covers pumice stone in powdered form, not further manufactured into specific products.