Clay Cupel for Assay from Mexico
Small clay cupels used in precious metal fire assaying to collect beads. Traditional fired clay construction fits 6903.90.00.10 as explicitly named refractory goods.
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
• Include assay process description to justify refractory classification
• Declare quantity per standard assay set for valuation
• Distinguish from common lab porcelain (6909)