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U.S. imports of ash and slag, including seaweed ash (kelp), nesoi (HS 262190) totaled $2.3M in July 2026, traded with 15 countries.
Importers of Ash and Slag, Including Seaweed Ash (Kelp), NESOI paid $245K in duties in July 2026 — an effective duty rate of 17% on $1.4M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: July 2026 dataClassified under a single 10-digit line (2621900000), this residual category captures industrial ash and slag not elsewhere specified, including kelp-derived seaweed ash used in specialty chemical and fertilizer applications. The breadth of the heading means correct classification often hinges on the origin material and intended use — blast furnace slag, fly ash, and kelp ash each carry distinct downstream regulatory and commercial profiles. Canada leads US import supply, followed by Turkey and China, reflecting both proximity-driven bulk slag trade and specialty mineral sourcing. Importers should confirm that ash or slag byproducts from metal smelting are not more specifically classifiable under Chapter 26's dedicated slag headings before defaulting to this NESOI line.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
205 shipments/mo
The NESOI designation means 262190 applies only when no other Chapter 26 heading more precisely describes the material. Blast furnace slag from iron production, for example, may fall under 2618 or 2619, while ash from specific metals has dedicated subheadings. A licensed customs broker or binding ruling from CBP is the most reliable way to confirm classification for ambiguous residues.
Both fall under the same 10-digit tariff line (2621900000), so duty treatment is identical. However, kelp-derived ash may attract additional scrutiny depending on its intended use — for example, as a soil amendment or food-grade mineral supplement — which could trigger FDA or EPA review separate from customs classification.
HSChapter 26
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Subheading 1 of 2 in heading 2621
Subheading 262190 · $2.3M of $1.4M
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 |
|---|---|---|---|---|---|
| 2621900000 | Ash & Slag, Including Seaweed Ash (kelp), NESOI | $1.4M | 1.10% | 32.21% | $15K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2621900000 | Ash & Slag, Including Seaweed Ash (kelp), NESOI | $1.8M |
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
$2.3MYoY · Pro
Exports
$1.8MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.
Imports · July 2026
origin
Canada and China together supply 61% of it.
customs district
destination
entry
rate provision · imports
39.1% enters free of duty; the effective duty rate is 10.46%.