Mullite-Forming Chamotte Grogs from Germany
Chamotte grogs engineered to form mullite crystals upon firing, used in advanced refractories for petrochemical heaters. Classified under HTS 2508.70.00.00 as chamotte earths, these calcined clays remain unfinished raw materials. Their high purity supports consistent mullite development in end products.
Duty Rate — Germany → United States
10%
Rate breakdown
9903.05.3910%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.97, articles the product of a member state of the European Union, with an ad valorem (or ad valorem equivalent) rate of duty under column 1 less than 10 percent, as provided for in U.S. note 52 to this subchapter
Import Tips
• Provide XRD analysis showing mullite precursors; declare as 'calcined clay grog' explicitly; ensure no pre-firing to mullite phase to stay in 2508