HS Code for Cork insulation

Cork insulation is typically classified under HS code 4504.90. This code covers articles of agglomerated cork. Agglomerated cork is produced by taking cork waste (granules or dust) and binding it together under heat and pressure, often with the addition of a binding substance like resin or glue. Insulation products, such as boards, panels, or shells for pipe covering, are almost exclusively made from agglomerated cork because the process allows for uniform density and specific dimensions that natural cork cannot provide. Heading 4504 is distinct from 4503 because it focuses on the manufactured composite material rather than the natural bark. The classification 4504.90 is used for these finished insulation products that do not fit into the specific category of blocks or tiles for floors or walls (which might fall under 4504.10). Agglomerated cork is an excellent thermal and acoustic insulator, and its classification under 4504.90 ensures it is treated as a manufactured article of cork. It is important to distinguish this from mineral-based insulation like glass wool or rock wool, which are classified in Chapter 68. Even if the cork insulation is treated with fire retardants or other chemicals, it remains under 4504 as long as the agglomerated cork provides the essential character of the product.

Products Included

• Agglomerated cork insulation boards
• Cork acoustic insulation panels
• Cork pipe insulation shells
• Expansion joint fillers made of agglomerated cork
• Cork vibration damping sheets

Common Misclassification

Cork insulation is sometimes misclassified under 4503.90 (articles of natural cork), but natural cork is rarely used for industrial insulation. It may also be confused with 6806.90, which covers other mineral insulating materials, though cork is clearly excluded from Chapter 68.

FAQ

What is the HS code for cork insulation?

The HS code for agglomerated cork insulation products is 4504.90.

Is cork insulation classified as a construction material?

While used in construction, it is classified based on its material composition (cork) under Chapter 45 rather than general construction headings.