Flame-Retardant PS Foam Sheets from Canada
Cellular polystyrene sheets with chemical modification for fire resistance in building/construction. Still 3921.11.00.00 as base styrene polymer per subheading note (c). Self-extinguishing.
Duty Rate — Canada → United States
15.3%
Rate breakdown
9903.05.2910%Except for products described in headings 9903.05.85–9903.05.93, articles the product of Canada, as provided for in U.S. note 52 to this subchapter
Import Tips
• Document flame retardant as modification not changing base polymer
• UL certifications speed clearance
• Avoid 'Other' subheading confusion