HS Code for XPS foam

XPS foam, or Extruded Polystyrene foam, is classified under HS code 3921.11. This classification is governed by the material composition and the physical state of the product. Chapter 39 of the Harmonized System covers plastics and articles thereof. Heading 3921 specifically addresses other plates, sheets, film, foil, and strip of plastics. Within this heading, the code 3921.11 is reserved for products that are cellular and made from polymers of styrene. XPS is manufactured through a continuous extrusion process where the plastic resin and other ingredients are combined and then forced through a die. As the plastic exits the die, it expands and hardens into a dense, closed-cell structure. This "cellular" nature is the primary reason for its placement in the 3921.11 subheading. The closed-cell structure provides high compressive strength and superior thermal resistance, making it a staple in the construction industry for insulation. Because it is not "expanded" in a mold like EPS (Expanded Polystyrene), but rather extruded, it maintains a distinct classification profile under the styrene polymer category. The classification applies to XPS in the form of rigid boards or sheets commonly used for wall, roof, and foundation insulation.

Products Included

• Extruded polystyrene insulation boards
• XPS rigid foam sheets
• Cellular styrene polymer plates
• XPS foam underlayment
• Closed-cell polystyrene thermal insulation

Common Misclassification

XPS foam is often confused with EPS (Expanded Polystyrene), which is also a cellular styrene polymer. While both may fall under 3921.11 in some jurisdictions, EPS in the form of raw beads is classified under 3903.11. Furthermore, if the foam is made of polyurethane rather than styrene, it must be classified under 3921.13. It is also important not to confuse these sheets with non-cellular plastic plates, which fall under heading 3920.

FAQ

What is the HS code for XPS foam?

The HS code for XPS (Extruded Polystyrene) foam in plates or sheets is 3921.11.

Is XPS foam classified differently if it is used for packaging?

No, the classification is based on the material (cellular styrene polymer) and form (sheets/plates), so 3921.11 remains the correct code regardless of the end-use in construction or packaging.