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Harmonized System
U.S. exports of hydraulic lime (HS 252230) totaled $32K in July 2026.
Hydraulic Lime imports of $17K in July 2026 ran 49% below the year-to-date monthly average of $34K.
Last updated: July 2026 dataHydraulic lime sets and hardens through a chemical reaction with water, distinguishing it from non-hydraulic (air-set) limes and making it particularly valued in historic building restoration, conservation masonry, and specialty mortars where flexibility and breathability are required. France is the leading US import source for this niche product, followed by Mexico and Spain. All imports are classified under tariff line 2523000000, and buyers should confirm whether the product meets ASTM C141 or equivalent European EN 459 standards for their intended application.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
3 shipments/mo
Hydraulic lime (heading 2522) is produced from limestone containing silica and alumina impurities that enable hydraulic setting, but it is not Portland cement (heading 2523). The key classification test is the manufacturing process and composition: hydraulic lime is not ground with clinker and does not meet the Portland cement specification. Products marketed as 'natural hydraulic lime' (NHL) belong under 2522300000, not under the cement headings.
France has a long tradition of producing natural hydraulic lime from specific limestone deposits, and French producers have established international reputations for NHL grades used in heritage conservation projects. This technical specialization, combined with established export infrastructure, explains France's leading position in US import supply.
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Subheading 3 of 3 in heading 2522
Subheading 252230 · $17K of $8.9M
Exports · July 2026
destination
Canada and Mexico together take 100% of it.
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origin
entry
rate provision · imports
45.6% enters free of duty; the effective duty rate is 5.44%.
ImportsExports
Imports
$17KYoY · Pro
Exports
$32KYoY · Pro
12-mo low · imports
YoY · ProFewer than 6 of the last 12 months reported trade above $500K; the trend chart is not shown for thin series.
Through July 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 | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 2522300000 | Hydraulic Lime | $17K | 5.44% | 54.41% | $940 |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2522300000 | Hydraulic Lime | $32K |
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.