U.S. exports of Insulating Mineral Materials for Sound or Heat, N.E.S. (SITC 66353) totaled $71.4M in August 2026.
Importers of Insulating Mineral Materials for Sound or Heat, N.E.S. paid $1.8M in duties in August 2026, an average duty rate of 8.88% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Insulating Mineral Materials for Sound or Heat, N.E.S. imports of $21.5M in August 2026 ran 11% above the year-to-date monthly average of $19.5M.
Last updated: August 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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921 import shipments a month
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.
Basic heading 40 of 766 in section 6
Basic heading 66353 · $71.4M of $13.0B
Exports · August 2026
destination
Mexico and United Kingdom together take 50% 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
$21.5MYoY · free account
Exports
$71.4MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $222.9M of Insulating Mineral Materials for Sound or Heat, N.E.S. and exported $349.8M.
Through August 2026. Source: U.S. Census Bureau.
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