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HSChapter 25
U.S. imports of bentonite (including calcined) (HS 250810) totaled $1.6M in April 2026, traded with 16 countries.
Importers of Bentonite (Including Calcined) paid $72K in duties in April 2026 — an effective duty rate of 6.4% on $1.1M in dutiable value, based on actual customs collections rather than the published tariff schedule. Bentonite (Including Calcined) imports of $1.6M in April 2026 ran 10% above the year-to-date monthly average of $1.4M.
Last updated: April 2026 dataBentonite's swelling and sealing properties — driven by its smectite clay mineral content — make it indispensable for drilling mud in oil and gas operations, foundry sand bonding, landfill liners, and cat litter. Mexico is the leading US import source under this heading, followed by China and Canada. The single 10-digit line (2508100000) covers both natural and calcined forms, though sodium-activated (Wyoming-type) and calcium bentonite carry distinct performance profiles that buyers specify separately in commercial contracts.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
Sodium bentonite swells significantly when hydrated and is preferred for drilling fluids, pond liners, and foundry bonding. Calcium bentonite swells less and is more commonly used in absorbent and clarification applications. Both types are classified under the same 10-digit line (2508100000); the distinction is commercial and specification-driven, not a classification boundary.
For drilling-grade bentonite, buyers often reference API 13A specifications in purchase contracts, and suppliers may provide certificates of conformance. While these documents are not required by CBP for entry, they support the declared end use and can be relevant if the material is subject to antidumping review or if the importer seeks to establish product specifications for duty drawback or other purposes.
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Monthly import values over time
| Country | Imports | Exports | Balance |
|---|---|---|---|
| CANADA | $46K | $3.1M | +$3.0M |
| MEXICO | $399K | $1.4M | +$977K |
| CHINA | $714K | $931K | +$217K |
| JAPAN | $6K | $1.4M | +$1.4M |
| KOREA, SOUTH | $7K | $767K | +$761K |
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 2508100000 | BENTONITE, WHETHER OR NOT CALCINED | $1.6M | 6.43% | $72K |
BENTONITE, WHETHER OR NOT CALCINED
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2508100000 | BENTONITE, WHETHER OR NOT CALCINED | $12.6M |
BENTONITE, WHETHER OR NOT CALCINED
31.4K t
PORTLAND CEMENT EXCEPT WHITE PORTLAND CEMENT
HS 252329
SULFUR OF ALL KINDS, NOT SUBLIMED,PRECIP,COLLOIDAL
HS 250300
SALT INCL TBL/DENTRD, PURE SODM CHLOR ETC; SEA WTR
HS 250100
UNGRND NAT CAL PHSPH, ALUM CAL PHOS A PHOS CHALK
HS 251010
FLUORSPAR OV 97% OF CALCIUM FLUORD BY WGHT
HS 252922
PEBBLES, GRAVEL ETC. FOR CONCRETE AGGREGATES ETC.
HS 251710
| State | Imports | Exports | Balance |
|---|---|---|---|
| South Dakota | -- | $2.6M | +$2.6M |
| Mississippi | $146K | $2.4M | +$2.3M |
| Texas | $339K | $1.1M | +$804K |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| TACOMA, WA | -- | $2.1M | +$2.1M |
| HOUSTON, TX | -- | $1.3M | +$1.3M |
| CHARLESTON, SC | $42K | $1.0M | +$996K |