Foamed Slag Thermal Block
Lightweight blocks produced from expanded foamed slag, used for insulated concrete forms in construction. Falls under HTS 6806.90.00.90 as an expanded mineral material article for heat-insulation, not refractory products of chapter 69.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If cement-bonded with over 30% cement
Cementitious articles classify under heading 6810, excluding pure expanded slag.
If for high-temperature industrial furnace use
Refractory foamed slag becomes Chapter 69 if designed for 1500°C+ applications.
If surface-worked like monumental stone
Machined decorative blocks could fall under worked stone headings per Chapter 68 notes.
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Import Tips & Compliance
• Certify compressive strength to differentiate from Chapter 69 refractories
• Include production process docs showing expansion without high-temperature firing
• Watch for weight-based duties; declare accurately to avoid under-valuation penalties
Related Products under HTS 6806.90.00.90
Rock Wool Insulation Batt
A pre-cut batt made from spun rock wool fibers, bonded with resin, used for thermal and acoustic insulation in walls and attics. It falls under HTS 6806.90.00.90 as a heat-insulating and sound-absorbing article of mineral material, not classified in headings 6811, 6812, or chapter 69.
Exfoliated Vermiculite Loose Fill
Expanded vermiculite granules used as lightweight loose-fill insulation for attics and masonry walls, providing fire resistance and thermal protection. Classified under HTS 6806.90.00.90 as an expanded mineral material for heat-insulating purposes, distinct from mixtures or shaped articles.
Mineral Wool Acoustic Ceiling Tile
Perforated ceiling panels made from compressed slag wool with a decorative facing, designed for sound absorption in commercial spaces. It qualifies for HTS 6806.90.00.90 as a sound-absorbing article of mineral materials, excluding those of heading 6811 or 6812.
Expanded Clay Pebbles Hydroponics
Round, lightweight expanded clay aggregate (LECA) balls used as growing medium in hydroponic systems for thermal insulation and drainage. Classified in HTS 6806.90.00.90 as expanded clays, a sound-insulating mineral material not covered by other headings.
Slag Wool Pipe Insulation
Cylindrical jackets of resin-bonded slag wool for insulating steam pipes and HVAC ducts, reducing heat loss and noise. HTS 6806.90.00.90 covers this as a heat- and sound-insulating article of mineral wool.
Vermiculite Fireproof Board
Compressed exfoliated vermiculite boards for fire-rated enclosures and safes, offering high-temperature insulation. Under HTS 6806.90.00.90 as a mixture/article of heat-insulating mineral materials.