Magnesia Spinel Refractory Blocks from Japan
Pre-fired blocks combining magnesia with spinel (MgAl2O4) where MgO exceeds 50%, used in cement kiln burning zones. Offers superior thermal spalling resistance. Falls under HTS 6902.10.50.00 for magnesium-dominant refractory constructional goods.
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
• Document spinel content calculation method as it contributes to MgO equivalence
• Avoid bundling with metal casings which could trigger Chapter 73 classification
• Certify as finished refractory goods, not parts for further assembly