Sillimanite Grain for Refractories from Japan
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 — 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
• 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