Magnesium Oxide Polymerization Catalyst from Mexico
High-purity MgO powder serving as catalyst in polypropylene production. Classified in 3815.90.3000 for its wholly inorganic composition and role as reaction initiator.
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
• Surface area specifications (>100m²/g) distinguish catalytic grade from refractory grade
• Include polymerization reaction data demonstrating accelerator function
• Antidumping duties may apply from certain origins; verify scope rulings