Microporous Polyethylene Roofing Underlayment Film
Breathable microporous polyethylene film used as synthetic roofing underlayment to prevent moisture buildup. The cellular microporous structure qualifies it as a cellular sheet of polyethylene under tariff item 3921.19.00.
Import Duty Rates by Country of Origin
| Origin Country | MFN Tariff | Surtaxes | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | Free | — | Free |
| 🇲🇽Mexico | Free | — | Free |
| 🇺🇸United States | Free | — | Free |
| 🇩🇪Germany | Free | — | Free |
| 🇯🇵Japan | Free | — | Free |
More Specific Codes
This product may fall under a more specific subheading:
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If the underlayment is non-cellular
Solid polyethylene sheets fall under heading 39.20.
If the underlayment is a structural element for roofs
Builders' ware of plastics, such as structural elements, is classified in heading 39.25.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right tariff item — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Ensure the underlayment is imported as rolls of sheeting, not as cut-to-size pieces for specific roofs, to remain in heading 39.21
• If the product has a textile backing, it may be classified in Chapter 59 instead
• Provide installation specifications to demonstrate the product's function as a building material, but note that heading 39.25 covers certain builders' ware
Related Products under Tariff item 3921.19.00
Battery Grade PP Microporous Membrane
>- High-purity microporous polypropylene membrane used as a lithium-ion battery separator, with controlled pore distribution. This is a cellular (microporous) sheet of polypropylene, which is not one of the named plastics in other subheadings of heading 39.21, so it falls under 3921.19.00 as "of other plastics."
Breathable PE Diaper Backing Film
>- Microporous polyethylene film used as a soft, breathable backsheet in disposable diapers. This is a cellular (microporous) sheet of polyethylene, which is not one of the named plastics in other subheadings of heading 39.21, so it falls under 3921.19.00 as "of other plastics."
Cellular ABS Sheets
Foamed acrylonitrile-butadiene-styrene (ABS) copolymer sheets for thermoforming applications. Since ABS is a copolymer where no single monomer unit contributes 95% or more by weight, it is classified under tariff item 3921.19.00 as a cellular sheet of 'other plastics'.
Cellular Acrylic Foam Tapes Base Sheets
>- Double-sided cellular acrylic polymer foam sheets used as a carrier for pressure-sensitive adhesive tapes. These sheets are cellular (foamed) and made of acrylic polymer, which is not one of the named plastics in other subheadings of heading 39.21, so they fall under tariff item 3921.19.00 as "of other plastics."
Cellular Acrylic Sheets
Foamed acrylic polymer sheets for signage and displays, with a cellular structure. As acrylic polymers are not specifically named in cellular subheadings, these sheets are classified under tariff item 3921.19.00 as 'of other plastics'.
Cellular Polyamide Foam Sheets
>- Cellular polyamide (nylon) foam sheets used for impact protection and vibration damping in machinery. Polyamide is not one of the named plastics in other subheadings of heading 39.21, and the cellular structure qualifies these sheets for classification under 3921.19.00 as "of other plastics."