Transformer Pressboard from Mexico
High-density pressboard weighing over 225 g/m², made from compressed wood fibers, used as insulation in oil-immersed electrical transformers. It falls under HTS 4805.93.20.00 as uncoated pressboard, not further worked beyond note 3 specifications, in sheets for electrical 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 grammage exceeds 225 g/m² via lab testing; customs may require certification to confirm pressboard specs
• Provide end-use declaration for electrical insulation to avoid reclassification; include transformer manufacturer specs
• Watch for moisture content limits under 8% to prevent mold issues during transit; common pitfall is improper packing