Fire-Clay Grogs from Mexico
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 — Mexico → United States
10%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
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