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SITCSection 6
U.S. exports of expanded mineral materials (exfoliated vermiculite, expanded clays, foamed slag) (SITC 66352) totaled $4.4M in July 2026.
Importers of Expanded Mineral Materials (Exfoliated Vermiculite, Expanded Clays, Foamed Slag) paid $156K in duties in July 2026 — an effective duty rate of 11% on $1.4M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: July 2026 dataExfoliated vermiculite, expanded clays (such as lightweight aggregate), and foamed slag are heat-processed mineral materials whose expanded cellular structure gives them low density and insulating properties valued in horticulture, construction lightweight aggregate, and passive fire protection. Vermiculite in particular has a dual commercial identity — traded both as a horticultural growing medium and as an industrial insulation fill — and the end-use context can influence classification at the HTS level. Expanded clay aggregate (often marketed as LECA) is a growing import category driven by green-building and hydroponic applications.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
106 shipments/mo
Basic heading 66352 · $2.1M of $26.7B
Both horticultural and industrial vermiculite in exfoliated form generally fall under this heading, but the grade, particle size, and packaging may influence the specific HTS subheading. Importers should confirm the intended use and physical specification with their customs broker, as some horticultural mineral media may trigger additional USDA APHIS review at the port of entry.
Lightweight expanded clay aggregate (LECA) is produced by firing clay at high temperatures until it expands into porous pellets. It is used as a drainage layer in green roofs, as a hydroponic growing medium, and as lightweight structural fill. Growing demand from sustainable construction and urban farming has increased import volumes, with production concentrated in Europe and parts of Asia.
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Exports · July 2026
destination
Canada and Japan together take 47% of it.
customs district
Census does not publish district detail for this classification system.
origin
Census does not publish state detail for this classification system.
entry
Census does not publish port detail for this classification system.
ImportsExports
Imports
$2.1MYoY · Pro
Exports
$4.4MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.