Chapter 2513 — Customs Tariff Headings
Subheadings
Products classified under Tariff item 25.13
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.
2513.10.00Crude 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.
2513.10.00Crushed 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.
2513.10.00Heat-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.
2513.10.00Industrial 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.
2513.10.00Lava 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.
2513.10.00Lightweight 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.
2513.10.00Mining 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.
2513.10.00Natural 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.
2513.10.00Pumice 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.
2513.10.00Pumice 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.
2513.10.00Raw 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.
2513.10.00Raw 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.
2513.10.00Unscreened 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.
2513.10.00Volcanic 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.
2513.20.00Almandine Garnet Sandblasting Media
Almandine garnet sandblasting media is washed and sized almandine garnet sand from Indian river deposits, optimized for paint removal. The garnet is a natural abrasive, and despite washing and sizing, it remains within the scope of tariff item 2513.20.00, as these processes are permitted by Chapter 25 Note 1.
2513.20.00Bulk Natural Tripoli Lumps
Bulk natural tripoli lumps, also known as rottenstone, are irregular pieces of siliceous sedimentary rock used for metal polishing. They are in a crude state, not subjected to processing beyond washing, crushing, or grinding, and qualify as natural abrasives under tariff item 2513.20.00.
2513.20.00Crude Indian Garnet Ore
Crude Indian garnet ore consists of irregular garnet-bearing rock fragments from Rajasthan, mined for abrasive applications. The ore is in a crude state, not heat-treated or processed beyond extraction, and falls under tariff item 2513.20.00 as natural garnet.
2513.20.00Crude Natural Emery
Crude natural emery is raw, unprocessed emery composed primarily of corundum and magnetite, extracted directly from natural deposits. Supplied in irregular lumps without cutting, sizing, or heat treatment, it qualifies as a natural abrasive under tariff item 2513.20.00.
2513.20.00Irregular Natural Emery Powder Feedstock
Irregular natural emery powder feedstock consists of large crude emery pieces destined for powdering. These pieces are in a crude state, without heat treatment or mixing, and are classified as natural abrasives under tariff item 2513.20.00.
2513.20.00Natural Corundum Chunks
Natural corundum chunks are irregular pieces of crystalline aluminum oxide from mineral deposits, supplied crude without refinement. These chunks are used in abrasive manufacturing and fall under tariff item 2513.20.00 as natural corundum.
2513.20.00Natural Emery Coarse Grain
Natural emery coarse grain consists of crushed and screened grains from natural emery rock, a corundum-garnet mixture from Naxos deposits. The crushing and screening are permitted mechanical processes under Chapter 25, and the product falls under tariff item 2513.20.00.
2513.20.00Natural Garnet Abrasive Grit
Natural garnet abrasive grit consists of coarse angular grains of natural almandine garnet from alluvial deposits, heat-treated for consistent hardness. Despite heat treatment, the product remains a natural abrasive under tariff item 2513.20.00, as the heading explicitly includes heat-treated natural abrasives.
2513.20.00Natural Olivine Sand Abrasive
Natural olivine sand abrasive is crushed olivine (magnesium-iron silicate) from Norwegian mines, used in foundry cleaning and shipyard blasting. The crushing is a permitted mechanical process, and the product falls under tariff item 2513.20.00 as other natural abrasives.
2513.20.00Natural Wollastonite Abrasive Powder
Natural wollastonite abrasive powder is micronized wollastonite mineral (calcium silicate) from natural deposits, used as a mild abrasive in toothpaste and polishing compounds. The micronization is a mechanical process permitted under Chapter 25, and the product falls under tariff item 2513.20.00.
2513.20.00Picrophyllite Natural Abrasive
Picrophyllite natural abrasive is a rare magnesium phyllosilicate crushed for specialty soft abrasives in optical polishing. The crushing is a permitted mechanical process, and the product falls under tariff item 2513.20.00 as other natural abrasives.
2513.20.00Raw Arkansas Stone Lumps
Raw Arkansas stone lumps are crude novaculite fragments, a premium natural sharpening abrasive. These lumps are unprocessed, without heat treatment or sizing, and qualify as other natural abrasives under tariff item 2513.20.00.
2513.20.00Raw Natural Garnet Pieces
Raw natural garnet pieces are crude, irregular fragments of almandine garnet from alluvial deposits, used as waterjet cutting abrasive feedstock. They are not heat-treated or sized, maintaining natural shapes, and fall under tariff item 2513.20.00.
2513.20.00Unprocessed Staurolite Sand Lumps
Unprocessed staurolite sand lumps are crude, irregular lumps of the staurolite mineral, valued for angular hardness in paint and abrasive applications. These lumps are raw, without heat treatment, and qualify as other natural abrasives under tariff item 2513.20.00.
2513.20.00Unrefined Rottenstone Pieces
Unrefined rottenstone pieces are irregular fragments of decomposed siliceous limestone used for fine abrasion. These pieces are in a crude state, without processing beyond extraction, and fall under tariff item 2513.20.00 as other natural abrasives.