U.S. imports of Slag Wool, Rock Wool & Similar Mineral Wools — Bulk, Sheets or Rolls (HS 680610) totaled $12.9M in August 2026, imported from 37 countries.
Importers of Slag Wool, Rock Wool & Similar Mineral Wools — Bulk, Sheets or Rolls paid $1.1M in duties in August 2026, an average duty rate of 8.69% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Slag Wool, Rock Wool & Similar Mineral Wools — Bulk, Sheets or Rolls imports of $12.9M in August 2026 ran 11% above the year-to-date monthly average of $11.6M.
Last updated: August 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.
1.0K import shipments a month
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.
Subheading 2 of 3 in heading 6806
Subheading 680610 · $12.9M of $36.8M
ImportsExports
Imports
$12.9MYoY · free account
Exports
$8.6MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $131.9M of Slag Wool, Rock Wool & Similar Mineral Wools — Bulk, Sheets or Rolls and exported $86.7M.
Through August 2026. Source: U.S. Census Bureau.
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Imports for consumption | Average duty rate | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 6806100090 | Oth Slag, Rock and Min Wool in Bulk, Sheet or Rlls | $9.1M | 11.19% | 69.36% | $1.0M |
| 6806100020 | Batts of Mineral Wool and Similar Nt Ov 61 Cm Wide | $2.4M | 0.12% | 0.93% | $3K |
| 6806100010 | Accoustical Pads A Bds Mnrl Wools A Smlr | $1.0M | 8.92% | 37.56% | $92K |
| 6806100060 | Pipe Coverings of Mineral Wools and Similar | $293K | 0.00% | 0.00% | -- |
| 6806100040 | Batts of Mineral Wool and Similar, Over 61 Cm Wide | $67K | 8.35% | 69.26% | $6K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 6806100000 | Slag Wools Rock or Oth Minrl Wools Bulk NESOI | $8.6M |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
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Imports · August 2026
origin
Canada and United Kingdom together supply 49% of it. United Kingdom pays 13.8% duty; Mexico 0.1%.
customs district
destination
entry
rate provision · imports
47.5% enters free of duty; duty collected equals 8.69% of imports for consumption.