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HSChapter 38
U.S. imports of prepared additives for cements, mortars, and concretes (HS 382440) totaled $7.3M in April 2026, traded with 26 countries.
Importers of Prepared Additives for Cements, Mortars, and Concretes paid $769K in duties in April 2026 — an effective duty rate of 18% on $4.2M in dutiable value, based on actual customs collections rather than the published tariff schedule. Prepared Additives for Cements, Mortars, and Concretes imports of $7.3M in April 2026 ran 15% above the year-to-date monthly average of $6.4M.
Last updated: April 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.
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.
Monthly import values over time
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HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 3824405000 | PREPRD ADDITIVES FOR CEMENTS, MORTARS, ETC, NESOI | $5.4M | 17.25% | $539K |
| 3824401000 | PREPRD ADDIT FOR CEMENT ETC,GT=5% BY WGT,GT=1 ARO | $995K | 23.23% | $208K |
| 3824402000 | PREPRD ADDITIVE FOR CEMENT ETC, OF INORGANIC SUBST | $905K | 10.43% | $22K |
PREPRD ADDITIVES FOR CEMENTS, MORTARS, ETC, NESOI
PREPRD ADDIT FOR CEMENT ETC,GT=5% BY WGT,GT=1 ARO
PREPRD ADDITIVE FOR CEMENT ETC, OF INORGANIC SUBST
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 3824400000 | PREPARED ADDITIVES FOR CEMENTS, MORTARS/CONCRETES | $13.7M |
PREPARED ADDITIVES FOR CEMENTS, MORTARS/CONCRETES
5.6M kg
PRODUCTS AND RESIDUALS OF CHEMICAL INDUSTRY, NESOI
HS 382499
DIAGNOSTIC OR LABORATORY REAGENTS INCL KITS, NESOI
HS 382219
CHEM ELEM DOPED, USED IN ELECTRON, DISCS WAFERS ET
HS 381800
SUPPORTED CATALYSTS W PREC METAL/PREC MTL COMPND
HS 381512
SUPPORTED CATALYSTS, NESOI
HS 381519
ADDITIVE FOR LUB OIL CONT PETRO/BITUMINOUS MINOIL
HS 381121
| State | Imports | Exports | Balance |
|---|---|---|---|
| Pennsylvania | $187K | $4.3M | +$4.1M |
| Texas | $1.4M | $2.3M | +$968K |
| Florida | $231K | $1.9M | +$1.7M |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| NEW YORK, NY | -- | $4.2M | +$4.2M |
| HOUSTON, TX | $978K | $2.1M | +$1.1M |
| BLAINE, WA | $1.3M | $475K | -$865K |