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.
Import Duty Rates by Country of Origin
| Origin Country | MFN Tariff | Surtaxes | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | Free | — | Free |
| 🇲🇽Mexico | Free | — | Free |
| 🇺🇸United States | Free | — | Free |
| 🇩🇪Germany | Free | — | Free |
| 🇯🇵Japan | Free | — | Free |
More Specific Codes
This product may fall under a more specific subheading:
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If the gravel is used primarily as construction aggregate
Heading 25.17 covers crushed stone for aggregates, which may take precedence if the product is not used as an abrasive.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right tariff item — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Confirm that the heat treatment does not alter the pumice's structure beyond what is permitted for this heading
• Provide technical specifications to CBSA showing the product remains a natural abrasive
• Verify the end-use to ensure it is not classifiable elsewhere, such as in construction materials
Related Products 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 Pumice Stone for Abrasive Cleaning
Crushed pumice stone is a naturally occurring volcanic rock processed by crushing and screening for use as an abrasive in cleaning applications. It is classified under tariff item 2513.10.00 as pumice stone, which includes natural abrasives whether or not heat-treated, provided no further processing beyond mechanical means has occurred.
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.
Fine Pumice Flour for Paint Extender
Fine pumice flour is ultrafine pumice stone ground to a powder, used as an inert extender pigment in paints and coatings to provide matting and abrasion resistance. It qualifies under tariff item 2513.10.00 as pumice stone, being a natural abrasive in powdered form without additional processing.
Heat-Treated Pumice Granules for Water Filtration
Heat-treated pumice granules are pumice stone subjected to thermal processing to enhance porosity for water filtration systems and aquariums. Tariff item 2513.10.00 covers pumice stone whether or not heat-treated, as explicitly stated in the heading, provided no other processing like mixing occurs.