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SITCSection 6
U.S. imports of mineral wools (slag wool, rock wool, etc.) in bulk, sheets, or rolls (SITC 66351) totaled $12.3M in April 2026, traded with 26 countries.
Importers of Mineral Wools (Slag Wool, Rock Wool, etc.) in Bulk, Sheets, or Rolls paid $1.2M in duties in April 2026 — an effective duty rate of 18% on $6.6M in dutiable value, based on actual customs collections rather than the published tariff schedule. Mineral Wools (Slag Wool, Rock Wool, etc.) in Bulk, Sheets, or Rolls imports of $12.3M in April 2026 ran 11% above the year-to-date monthly average of $11.0M.
Last updated: April 2026 dataRock wool and slag wool — produced by spinning molten mineral or industrial slag into fine fibers — are widely traded thermal and acoustic insulation materials used across construction, industrial piping, and HVAC applications. The physical form at import (bulk loose fiber, sheet, or roll) affects both classification and freight logistics, with rolls and sheets commanding different pricing tiers than bulk fiber. Importers sourcing these materials should be aware that certain mineral wool products have been subject to antidumping proceedings, making origin documentation and mill certifications commercially important.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
Yes — bulk loose mineral wool, formed sheets, and rolls may be classified differently at the HTS 10-digit level, which can affect applicable duty rates and any trade-remedy exposure. Importers should confirm the specific form with their supplier and verify the correct subheading with a licensed customs broker.
Rock wool is produced from natural basalt or diabase rock, while slag wool uses blast-furnace slag as its primary feedstock. Both fall under this SITC heading, but end-use specifications — particularly fire-resistance ratings and density requirements in building codes — may favor one over the other, and buyers should request product data sheets confirming fiber composition and thermal performance.
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Monthly import values over time