HS Code for Foamed slag

Foamed slag is classified under HS code 6806.20, which specifically covers exfoliated vermiculite, expanded clays, foamed slag, and similar expanded mineral materials. This classification is determined by the physical state of the material and its manufacturing process. Foamed slag is produced by treating molten blast-furnace slag with a controlled, limited amount of water or steam. This process causes the slag to expand into a porous, lightweight cellular material. Chapter 68 covers articles of stone, plaster, cement, or similar mineral materials. Heading 6806 specifically addresses heat-insulating, sound-insulating, or sound-absorbing mineral materials. Foamed slag is primarily utilized in the construction industry as a lightweight aggregate for concrete or as a loose-fill insulating material. Because it has undergone a specific expansion process that alters its density and structure, it is moved from the raw material categories of Chapter 26 (ores and slag) into the manufactured mineral products of Chapter 68. The porous nature of the foamed slag is the defining characteristic that aligns it with the other expanded minerals listed in subheading 6806.20.

Products Included

• Expanded blast furnace slag
• Lightweight slag aggregate for concrete
• Cellular slag for thermal insulation
• Crushed foamed slag for road construction
• Foamed slag pellets

Common Misclassification

Foamed slag is often confused with HS code 2618.00, which covers granulated slag (slag sand) from the manufacture of iron or steel. The key difference is the processing: 2618.00 refers to raw, granulated waste material, whereas 6806.20 refers to slag that has been intentionally expanded or 'foamed' to create a lightweight material with insulating properties. Additionally, it may be confused with 6806.10 (slag wool), but slag wool is a fibrous material, whereas foamed slag is a cellular, stony material.

FAQ

What is the HS code for foamed slag?

The correct HS code for foamed slag is 6806.20.

Is foamed slag the same as slag wool in the HS system?

No, they are different. Slag wool is a fibrous mineral wool classified under 6806.10, while foamed slag is an expanded cellular mineral classified under 6806.20.