Heat-Treated Pumice Granules for Water Filtration from Japan
Heat-treated pumice granules optimized for porosity in water filtration systems and aquariums. Classified in HTS 2513.10.0080 as 'other' pumice stone, permissible even if heat-treated per heading terms. Enhances biological filtration through natural porous structure.
Duty Rate — Japan → United States
12.5%
Rate breakdown
9903.05.4912.5%Except for products described in headings 9903.05.85–9903.05.92, articles the product of Japan, with an ad valorem (or ad valorem equivalent) rate of duty under column 1 less than 12.5 percent, as provided for in U.S. note 52 to this subchapter
Import Tips
• Provide heat-treatment process documentation proving it remains natural pumice, not chemically altered
• Test for heavy metals common in volcanic pumice to meet filtration safety standards
• Distinguish from expanded perlite which falls under heading 2530 unexpanded minerals