HS Code for Expanded clay

Expanded clay is classified under HS code 6806.20 because it represents a mineral material that has been thermally processed to change its physical density and structure. According to the General Rules of Interpretation (GRI), products are classified based on their constituent material and the degree of processing. Chapter 68 encompasses articles of stone, plaster, cement, and similar mineral substances. Heading 6806 specifically provides for slag wool, rock wool, and similar mineral wools, as well as exfoliated vermiculite, expanded clays, foamed slag, and similar expanded mineral materials. The expansion process, typically occurring in a rotary kiln at temperatures around 1200 degrees Celsius, results in a lightweight aggregate with a hard outer shell and a porous core. This thermal expansion is the defining characteristic for this specific subheading, as it transforms the raw clay into a product with high insulation and low density.

Products Included

• Lightweight expanded clay aggregate (LECA)
• Expanded shale used for lightweight concrete
• Expanded obsidian and perlite for horticultural use
• Foamed slag and similar expanded mineral materials
• Intermixtures of expanded minerals for thermal insulation
• Hydroponic clay pebbles used in gardening systems
• Lightweight mineral aggregates for geotechnical fill

Common Misclassification

Expanded clay is frequently misclassified under heading 2508, which covers natural clays that have not been expanded. While 2508 includes clay that has been calcined, it does not include clay that has been expanded into the lightweight form described by 6806. Additionally, some importers mistakenly use 6904 for ceramic building bricks. However, expanded clay in its aggregate form is not a finished brick but a raw material for insulation or concrete, placing it firmly in 6806.20. Another confusion arises with 6806.10 (slag wool), but 6806.20 is the correct designation for expanded minerals.

FAQ

What is the HS code for Expanded clay?

The primary HS code for expanded clay is 6806.20, which covers exfoliated vermiculite, expanded clays, foamed slag, and similar expanded mineral materials.

Does the use of expanded clay in hydroponics change its HS code?

No, the HS code 6806.20 applies to expanded clay based on its physical properties and manufacturing process, regardless of whether it is used for construction, insulation, or as a growing medium in hydroponics.