Harmonized System
U.S. imports of Ash and Slag, Including Seaweed Ash (Kelp), NESOI (HS 262190) totaled $3.0M in August 2026, imported from 15 countries.
Importers of Ash and Slag, Including Seaweed Ash (Kelp), NESOI paid $139K in duties in August 2026, an average duty rate of 4.69% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Ash and Slag, Including Seaweed Ash (Kelp), NESOI imports of $3.0M in August 2026 ran 26% above the year-to-date monthly average of $2.4M.
Last updated: August 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.
201 import shipments a month
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.
Trade Directory
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Subheading 1 of 2 in heading 2621
Subheading 262190 · $3.0M of $3.0M
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 |
|---|---|---|---|---|---|
| 2621900000 | Ash & Slag, Including Seaweed Ash (Kelp), NESOI | $3.0M | 4.69% | 67.26% | $139K |
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 | $2.4M |
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
$3.0MYoY · free account
Exports
$2.4MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $27.5M of Ash and Slag, Including Seaweed Ash (Kelp), NESOI and exported $25.7M.
Through August 2026. Source: U.S. Census Bureau.
Imports · August 2026
origin
Canada and Japan together supply 63% of it. Turkey pays 12.5% duty; Canada 0.1%.
customs district
destination
entry
rate provision · imports
32.7% enters free of duty; duty collected equals 4.69% of imports for consumption.