Mullite Chamotte Grogs from Japan
Mullite chamotte grogs are fired, crushed mullite particles used as aggregate in refractory brick formulations. Classified under HTS 2508.60.00.00 alongside chamotte or dinas earths as processed refractory materials.
Duty Rate — Japan → United States
12.5%
Rate breakdown
9903.05.4912.5%Section 301 (forced labor) — Japan (col1 rate < 12.5 percent): MFN < 12.5% → total duty capped at 12.5%
Import Tips
• Provide firing temperature records (typically >1400°C) confirming chamotte processing
• Document grog sizing (0-5mm typical) and avoid any assembly into shapes
• Watch for reclassification if moisture content suggests hydraulic binders (heading 3816)