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HSChapter 68
U.S. imports of slag wool, rock wool & similar mineral wools — bulk, sheets or rolls (HS 680610) totaled $12.3M in April 2026, traded with 26 countries.
Last updated: April 2026 dataRock wool (stone wool) and slag wool — fibrous insulation produced by spinning molten mineral or industrial slag — are primary thermal and acoustic insulation materials in commercial construction, industrial pipe insulation, and fire-protection assemblies. The US tariff schedule is notably granular here, with dedicated lines for acoustic pads and boards (6806100010), narrow batts not over 61 cm wide (6806100020), wider batts (6806100040), pipe coverings (6806100060), and other bulk or roll forms (6806100090). Canada leads US imports under this heading, consistent with cross-border construction supply chains, with Mexico and the United Kingdom also significant sources. Importers should classify by physical form and end-use configuration, as the distinction between acoustic, thermal, and pipe-covering products determines the correct 10-digit line.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
The acoustic pad and board line (6806100010) applies to products specifically designed and marketed for sound attenuation, typically with a defined NRC (noise reduction coefficient) rating and often a facing. General thermal batts are classified by width — not over 61 cm (6806100020) or over 61 cm (6806100040). Products that serve both thermal and acoustic functions should be classified by their primary design purpose, supported by product specifications.
Mineral wool is an industrial material and does not trigger mandatory FSIS, FDA, or APHIS admissibility review. However, importers should be aware that certain refractory ceramic fibers (a distinct product from rock/slag wool) carry separate regulatory considerations under EPA and OSHA frameworks. Ensuring the product is correctly identified as rock or slag wool — not refractory ceramic fiber — is important both for classification and for downstream safety data sheet compliance.
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Monthly import values over time