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.
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 product is vermiculite or perlite, not pumice
Heading 25.30 covers unexpanded vermiculite, perlite, and chlorites, which are distinct from pumice.
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
• Ensure the substrate is free of soil, fertilizers, or pesticides, as those would change classification
• Confirm the granules are not expanded beyond natural pumice, as expanded perlite or vermiculite would be classified elsewhere
• Provide a product data sheet to CBSA showing it is unprocessed pumice
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 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.