Siliceous Dinas Earth for Glass Furnace Refractories from United States
Siliceous dinas earth, calcined from quartz-rich clays, is specialized for crown refractories in glass melting furnaces due to its low thermal expansion. It is classified as dinas earths under tariff item 2508.70.00, as it is a crude mineral product that has not been processed beyond calcination and mechanical treatment.
Duty Rate — United States → Canada
0%
Import Tips
• Ensure the dinas earth is not mixed with lime or other fluxes, as such mixtures may be classified as prepared refractories
• Provide silica content analysis and calcination details to support the classification
• Verify the product is not in the form of finished refractory shapes, which would fall under Chapter 69