Housewrap Microporous Polypropylene Film from Canada
Microporous polypropylene breathable film used in construction housewrap for moisture vapor transmission. Falls under HTS 3921.19.0010 as cellular microporous sheet of polypropylene in the 'other plastics' category.
Duty Rate — Canada → United States
16.5%
Rate breakdown
9903.03.0110%Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Import Tips
• Test for ASTM E96 water vapor transmission to document breathability confirming microporous structure
• Rolls must not exceed 48.5cm width for potential Free (B) treatment per heading 3921 US note
• Avoid bulk packaging confusion with retail; classify by material form, not end-use packaging