Polystyrene Foam Underlayment Sheets
Polystyrene foam underlayment sheets are EPS foam sheets used as flooring underlayment for sound and thermal insulation beneath laminate tiles. They are classified under tariff item 3921.11.00 as cellular plates and sheets of polymers of styrene, being raw sheets for installation.
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 sheets have a self-adhesive backing for direct application to floors
Heading 3918 covers floor coverings of plastics, which may apply if the sheets are self-adhesive.
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 sheets are imported as flat, uncut sheets, not as pre-cut underlayment panels for specific flooring sizes
• Declare the expanded polystyrene composition and cellular structure
• Check if the sheets have any adhesive backing or surface treatment that could affect classification
Related Products under Tariff item 3921.11.00
Architectural Foam Relief Sheets
Architectural foam relief sheets are cellular polystyrene sheets molded with decorative surface patterns for facade cornices and trim. They are classified under tariff item 3921.11.00 as cellular plates and sheets of polymers of styrene, per the chapter notes on cellular plastics.
Cellular PS Diffusion Plates
Cellular PS diffusion plates are polystyrene foam sheets engineered with a light-scattering cellular structure for use as light diffusion panels in LED lighting fixtures. They fall under tariff item 3921.11.00 as cellular plates and sheets of polymers of styrene, being raw sheets not yet incorporated into lighting articles.
EPS Foam Packaging Sheets
EPS foam packaging sheets are expanded polystyrene beadboard sheets cut to size for protective packaging of electronics and appliances. They are classified under tariff item 3921.11.00 as cellular plates and sheets of polymers of styrene, being raw sheets used in shipping.
EPS Foam Void Fill Sheets
EPS foam void fill sheets are expanded polystyrene sheets designed for hand-tearing into void fill material for shipping cartons. They fall under tariff item 3921.11.00 as cellular plates and sheets of polymers of styrene, being raw sheets not yet converted into packing articles.
Expandable PS Foam Billet Sheets
Expandable PS foam billet sheets are large cellular polystyrene sheets sliced from billets for further fabrication into custom foam parts. They are classified under tariff item 3921.11.00 as cellular plates and sheets of polymers of styrene, being intermediate products for industrial use.
Flame-Retardant PS Foam Sheets
Flame-retardant PS foam sheets are cellular polystyrene sheets chemically modified with fire-resistant additives for building and construction applications. They are classified under tariff item 3921.11.00 as cellular plates and sheets of polymers of styrene, as the chemical modification does not change the base polymer classification per subheading note 1(c).