U.S. imports of Hydraulic Cements, N.E.S. (SITC 66129) totaled $9.6M in August 2026, imported from 9 countries.
Importers of Hydraulic Cements, N.E.S. paid $5K in duties in August 2026, an average duty rate of 0.05% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Hydraulic Cements, N.E.S. imports of $9.6M in August 2026 ran 17% above the year-to-date monthly average of $8.2M.
Last updated: August 2026 dataPozzolanic cements, slag cements, masonry cements, and other hydraulic binders that do not fit the Portland, aluminous, or clinker categories fall under this residual heading — a classification that requires careful technical documentation to distinguish from the more specifically defined cement types. Specialty hydraulic cements are increasingly relevant in sustainable construction, where supplementary cementitious materials (SCMs) such as fly ash blends or natural pozzolan cements are specified to reduce embodied carbon. Importers of novel or blended hydraulic cement formulations should obtain a binding ruling from CBP to confirm classification before large-volume shipments.
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1.2K import shipments a month
This residual category captures hydraulic binders not classified as Portland cement, aluminous cement, or clinker — including natural pozzolan cements, slag cements, masonry cements, and proprietary blended hydraulic binders. The defining characteristic is that they set and harden through a hydraulic reaction but do not meet the compositional definitions of the more specific cement headings.
The importer should obtain a detailed technical data sheet and mill certificate showing the product's composition, clinker content, and any supplementary cementitious materials (SCMs) present. If clinker content exceeds thresholds that would bring the product within the Portland cement definition, reclassification may be required. A binding ruling request to CBP, supported by the technical documentation, is the most reliable way to confirm the correct heading before importation.
Basic heading 344 of 766 in section 6
Basic heading 66129 · $9.6M of $27.0B
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Imports · August 2026
origin
Canada and Mexico together supply 99% of it. France pays 10.0% duty; Mexico 0.0%.
customs district
Census does not publish district detail for this classification system.
destination
Census does not publish state detail for this classification system.
entry
Census does not publish port detail for this classification system.
ImportsExports
Imports
$9.6MYoY · free account
Exports
$5.2MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $111.3M of Hydraulic Cements, N.E.S. and exported $32.9M.
Through August 2026. Source: U.S. Census Bureau.