Calcined Kyanite Powder from Mexico
Calcined kyanite is a high-alumina aluminosilicate mineral processed by heating to stabilize its crystal structure, preventing volume expansion during ceramic firing. It is classified under HTS 2508.50.00.00 as calcined kyanite, a form of sillimanite group mineral used primarily in refractory and ceramic applications.
Duty Rate — Mexico → United States
10%
Rate breakdown
9903.05.5510%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.94, articles the product of Mexico, as provided for in U.S. note 52 to this subchapter
Import Tips
• Verify mineral purity through lab analysis certificates to confirm andalusite/kyanite/sillimanite content over 50% as per Chapter 25 notes
• Include heat treatment records showing calcination process to distinguish from unprocessed minerals under heading 2512
• Avoid misclassification as synthetic mullite (HTS 2529); provide geological origin documentation