U.S. exports of Prepared Additives for Cements, Mortars, and Concretes (HS 382440) totaled $11.5M in August 2026.
Importers of Prepared Additives for Cements, Mortars, and Concretes paid $633K in duties in August 2026, an average duty rate of 6.86% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Prepared Additives for Cements, Mortars, and Concretes imports of $9.2M in August 2026 ran 32% above the year-to-date monthly average of $7.0M.
Last updated: August 2026 dataFormulated chemical admixtures for cement, mortar, and concrete — including plasticizers, accelerators, retarders, and air-entraining agents — are classified here when they are prepared mixtures rather than single chemical compounds. Canada leads US imports, consistent with the deep integration of North American construction materials supply chains. The US schedule breaks this heading into four 10-digit lines (3824401000, 3824402000, 3824405000, and the base 3824400000), with distinctions based on aromatic content, inorganic composition, and residual NESOI status — details that matter for both duty and chemical regulatory compliance.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
262 import shipments a month
Line 3824401000 applies to prepared additives containing 5% or more by weight of one or more aromatic or modified aromatic substances, while 3824402000 covers those of inorganic substances, and 3824405000 is the NESOI residual. Importers should obtain a full compositional analysis to determine which line applies, as the aromatic threshold is a common source of misclassification.
CBP may request a safety data sheet (SDS), a certificate of analysis showing component percentages, and the manufacturer's technical data sheet describing the product's intended function. For blends near the aromatic content threshold, a laboratory analysis confirming the exact percentage of aromatic substances is advisable to defend the chosen 10-digit line.
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Subheading 3 of 17 in heading 3824
Subheading 382440 · $11.5M of $606.3M
Exports · August 2026
destination
customs district
origin
entry
rate provision · imports
49.5% enters free of duty; duty collected equals 6.86% of imports for consumption.
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 |
|---|---|---|---|---|---|
| 3824405000 | Preprd Additives for Cements, Mortars, Etc, NESOI | $5.9M | 7.34% | 57.85% | $432K |
| 3824402000 | Preprd Additive for Cement Etc, of Inorganic Subst | $2.7M | 2.79% | 25.26% | $76K |
| 3824401000 | Preprd Addit for Cement Etc, Gt=5% by Wgt, Gt=1 Aro | $635K | 19.82% | 89.58% | $126K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 3824400000 | Prepared Additives for Cements, Mortars/Concretes | $11.5M |
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.
ImportsExports
Imports
$9.2MYoY · free account
Exports
$11.5MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $76.6M of Prepared Additives for Cements, Mortars, and Concretes and exported $133.9M.
Through August 2026. Source: U.S. Census Bureau.