Fire-Clay Grogs from Japan
Fire-clay grogs are crushed and screened particles of fired clay used as aggregate in refractory mixes. They qualify under HTS 2508.30.00.00 as fire-clay (chamotte or dinas earths), valued for thermal stability in castables. Common in foundry and boiler applications.
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
• Declare particle size distribution to distinguish grogs from powder; uniform sizing avoids bulk mineral reclassification
• Certify as chamotte (fired then crushed) vs raw clay for accurate sub-description within 2508.30
• Avoid packaging suggesting retail sets, which could trigger Chapter 68 for articles