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U.S. exports of bentonite (including calcined) (HS 250810) totaled $14.7M in July 2026.
Importers of Bentonite (Including Calcined) paid $53K in duties in July 2026 — an effective duty rate of 16% on $344K in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: July 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.
214 shipments/mo
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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ImportsExports
Imports
$1.5MYoY · Pro
Exports
$14.7MYoY · Pro
12-mo low · imports
YoY · ProThrough 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 |
|---|---|---|---|---|---|
| 2508100000 | Bentonite, Whether or not Calcined | $1.5M | 3.61% | 23.30% | $53K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2508100000 | Bentonite, Whether or not Calcined | $14.7M |
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.
Subheading 1 of 6 in heading 2508
Subheading 250810 · $1.5M of $3.1M
Exports · July 2026
destination
customs district
origin
entry
rate provision · imports
76.7% enters free of duty; the effective duty rate is 3.61%.