Siliceous Dinas Earth for Glass Furnace Refractories from Mexico
Siliceous dinas earth, calcined from quartz-rich clays, is specialized for crown refractories in glass melting furnaces due to low thermal expansion. HTS 2508.70.00.00 captures it as dinas earths, excluding finished or expanded forms per chapter notes. Bulk granules ensure proper classification as raw refractory material.
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
• Certify quartzite origin and calcination temp (>1400°C) for dinas authenticity; segregate from brick shipments to avoid 6903; monitor silica purity to prevent 2505 sand confusion