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SITCSection 6
U.S. imports of insulating mineral materials for sound or heat, n.e.s. (SITC 66353) totaled $20.3M in April 2026, traded with 39 countries.
Importers of Insulating Mineral Materials for Sound or Heat, N.E.S. paid $1.6M in duties in April 2026 — an effective duty rate of 11% on $14.4M in dutiable value, based on actual customs collections rather than the published tariff schedule. Insulating Mineral Materials for Sound or Heat, N.E.S. imports of $20.3M in April 2026 ran 11% above the year-to-date monthly average of $18.4M.
Last updated: April 2026 dataCovering mineral-based insulation products that do not fit the named categories — excluding asbestos, asbestos-cement, cellulose-fiber cement, and ceramic goods — this heading captures specialty inorganic insulation materials used in industrial and construction applications where thermal or acoustic performance is required. Products such as perlite board, calcium silicate insulation, and microporous silica panels may fall here when not classifiable under more specific headings. Because the NES designation requires systematic exclusion of competing headings, importers should document the material composition and manufacturing process to defend classification.
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Asbestos-containing insulation is explicitly excluded and falls under separate headings with distinct regulatory treatment. The US EPA and CPSC impose strict import controls on asbestos-containing articles, and misclassifying such products under this residual insulation heading could expose importers to serious compliance liability. Material composition testing is strongly recommended when the mineral identity of an insulation product is uncertain.
Mineral wool (rock wool, slag wool, glass wool) has its own dedicated heading (66351). This NES heading captures mineral insulation products that are not fibrous wool-type materials — for example, rigid calcium silicate boards, microporous panels, or perlite-based insulation shapes. The physical form and fiber vs. non-fiber character are the primary classification differentiators.
| Country | Imports | Exports | Balance |
|---|---|---|---|
| CANADA | $1.5M | $10.1M | +$8.5M |
| MEXICO | $2.5M | $5.0M | +$2.6M |
| JAPAN | $5.0M | $415K | -$4.6M |
| UNITED KINGDOM | $685K | $2.4M | +$1.7M |
| GERMANY | $2.1M | $561K | -$1.6M |
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Monthly import values over time