Sillimanite Grain for Refractories from Mexico
Sillimanite grains are crushed and sized particles of sillimanite mineral (Al2SiO5) used in refractory castables and ramming mixes. This product falls under HTS 2508.50.00.00 as unprocessed sillimanite, valued for its high melting point above 1600°C.
Duty Rate — Mexico → United States
10%
Rate breakdown
9903.03.0110%Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Import Tips
• Specify grain size distribution (e.g
• 3-6mm) in commercial invoices to justify non-agglomerated status
• Include thermal expansion test data distinguishing from mullite products
• For container shipments, ensure ventilation declarations to prevent moisture absorption affecting classification