Calcined Dolomite Filler for Polymer Composites from Mexico
Micronized calcined dolomite used as functional filler in polypropylene and PVC compounds for improved stiffness. Classified 2518.20.00.00 as processed mineral powder, prior to plastics incorporation.
Duty Rate — Mexico → United States
13%
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
• D50 particle size analysis confirms filler grade vs coarse aggregates
• Surface treatment certificates if stearate-coated to avoid 3824 classification
• Bulk density tests distinguish from built-up mica splittings