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Polystyrene Foam Underlayment Sheets

EPS foam sheets used as flooring underlayment for sound and thermal insulation beneath laminate tiles. Classified 3921.11.00.00 as cellular styrene polymer plates. Moisture-resistant grade.

Import Duty Rates by Country of Origin

Origin CountryMFN RateCh.99 SurchargesTotal Effective Rate
🇨🇳China5.3%+35.0%40.3%
🇲🇽Mexico5.3%+10.0%15.3%
🇨🇦Canada5.3%+10.0%15.3%
🇩🇪Germany5.3%+10.0%15.3%
🇯🇵Japan5.3%+10.0%15.3%

Alternative Classifications

This product could be classified differently depending on its characteristics or intended use.

3921.13Lower: 14.2% vs 40.3%

If polyurethane-based foam instead of styrene

Cellular polyurethane sheets use 3921.13 per polymer-specific subheadings.

4411.93Lower: 13.9% vs 40.3%

If fiberboard composite with PS core

Wood-based underlayment panels classify in Chapter 44.

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Import Tips & Compliance

• Certify compressive strength and R-value specs

• Avoid classification as finished flooring under 3918

• Check dimension limits per heading US note

Related Products under HTS 3921.11.00.00

Styrene Expanded Polystyrene Foam Sheets

Rigid foam sheets made from expanded polystyrene (EPS), a cellular polymer of styrene, used for insulation and packaging. Classified under HTS 3921.11.00.00 as cellular plates and sheets of styrene polymers per chapter notes on polymer classification. The cellular structure provides buoyancy and thermal insulation properties.

Polystyrene Foam Insulation Panels

Extruded polystyrene (XPS) foam panels designed for building wall and roof insulation. Falls under 3921.11.00.00 as cellular sheets of styrene polymers, confirmed by predominant styrene content. Provides high R-value thermal resistance.

EPS Foam Packaging Sheets

Beadboard expanded polystyrene sheets cut to size for protective packaging of electronics and appliances. Classified in 3921.11.00.00 for cellular styrene polymer sheets used in shipping. Lightweight and shock-absorbent.

Styrene Foam Board for Model Making

High-density polystyrene foam boards used by hobbyists for architectural models and crafts. Meets 3921.11.00.00 as cellular sheets of styrene polymers per weight predominance rule. Easily cut and painted.

Cellular PS Diffusion Plates

Polystyrene foam sheets engineered as light diffusion panels for LED lighting fixtures. Under 3921.11.00.00 for cellular styrene sheets with light-scattering cellular structure. Used in commercial displays.

Styrene Foam Sign Blanks

Extruded polystyrene foam boards sold as blanks for outdoor signage and displays. 3921.11.00.00 for cellular sheets of styrene polymers used in advertising. Weatherproof surface.