HS Code for Foam glass insulation

Foam glass insulation is classified under HS code 701690, which specifically covers multicellular or foam glass in various forms such as blocks, panels, plates, or shells. This classification is determined by the material's unique composition—glass that has been expanded through a thermal process to create a rigid, cellular structure. Chapter 70 of the Harmonized System is dedicated to glass and glassware. Within this chapter, heading 7016 includes glass paving blocks, bricks, and other articles of pressed or molded glass, as well as multicellular or foam glass. The classification is based on the physical state of the glass rather than its end-use as insulation. Foam glass is valued in industrial applications for its high compressive strength, impermeability to moisture, and excellent thermal resistance. The manufacturing process involves mixing crushed glass with a carbonaceous foaming agent and heating it in a kiln, which causes the glass to expand into millions of hermetically sealed cells. This process is central to its classification in 7016, as it creates the \"multicellular\" structure described in the HS explanatory notes. The material is often used in cryogenic applications or high-temperature industrial settings due to its unique physical stability and chemical inertness.

Products Included

• Rigid foam glass insulation blocks
• Foam glass pipe insulation shells
• Multicellular glass panels for building facades
• Foam glass boards for flat roof insulation
• Molded foam glass shapes for industrial equipment

Common Misclassification

Foam glass is often misclassified under HS code 6806. This heading covers mineral wools and expanded mineral materials like perlite or vermiculite. While foam glass serves a similar insulating purpose, its glass-based origin requires classification in Chapter 70. Another common mistake is using HS code 7019, which covers glass fibers and articles made from them (such as fiberglass insulation). Foam glass is distinct from glass fiber because it is a cellular solid rather than a fibrous material.

FAQ

What is the HS code for Foam glass insulation?

The primary HS code for foam glass in blocks, panels, or similar forms is 701690.

Is foam glass classified differently if used for road construction?

If the foam glass is in the form of gravel or aggregate for road beds, it may still fall under 701690 or potentially 7001 (cullet and other waste glass), but molded articles always remain in 701690.