U.S. exports of Fluxes & Other Auxiliary Preparations for Soldering, Brazing, or Welding; Prepared Welding Electrode Cores & Coatings (HS 381090) totaled $5.9M in August 2026.
Importers of Fluxes & Other Auxiliary Preparations for Soldering, Brazing, or Welding; Prepared Welding Electrode Cores & Coatings paid $513K in duties in August 2026, an average duty rate of 11.43% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule.
Last updated: August 2026 dataGermany and Japan are the dominant suppliers of these specialty chemical preparations, which include rosin-based and inorganic fluxes, as well as the coatings and cores applied to welding electrodes and rods. The US schedule subdivides this heading into four 10-digit lines: 3810901000 covers preparations containing more than 5% by weight of certain aromatic compounds; 3810902000 covers inorganic-substance-based preparations; 3810905000 covers prepared electrode cores and coatings; and 3810900000 captures residual cases. South Korea and France are also notable sources, reflecting the global spread of advanced welding consumables manufacturing. Classification between the inorganic and organic subheadings requires careful review of the flux chemistry, particularly for rosin-free or water-soluble formulations.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
211 import shipments a month
The key criterion is chemical composition: 3810901000 applies to preparations containing more than 5% by weight of aromatic or modified aromatic substances, while 3810902000 covers preparations based on inorganic substances. A no-clean or rosin-based flux would typically fall under the aromatic subheading, whereas a borax- or fluoride-based flux would fall under the inorganic subheading. Laboratory analysis of the formulation is often necessary to confirm classification.
Yes. Prepared cores and coatings used for welding electrodes or rods are classified under 3810905000, which is a distinct line from the flux and auxiliary preparation subheadings. Importers of coated electrode consumables should ensure their entry documents reference this specific line rather than the general flux provisions.
Subheading 2 of 2 in heading 3810
Subheading 381090 · $5.9M of $32.1M
ImportsExports
Imports
$4.5MYoY · free account
Exports
$5.9MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $53.6M of Fluxes & Other Auxiliary Preparations for Soldering, Brazing, or Welding; Prepared Welding Electrode Cores & Coatings and exported $74.7M.
Through August 2026. Source: U.S. Census Bureau.
Exports · August 2026
destination
Mexico and Singapore together take 51% of it.
customs district
origin
entry
rate provision · imports
12.9% enters free of duty; duty collected equals 11.43% of imports for consumption.
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 |
|---|---|---|---|---|---|
| 3810902000 | Fluxes & Oth Auxilary Prep, of Inorganic Substance | $2.3M | 10.63% | 92.02% | $249K |
| 3810905000 | Prep Used As Cores/Coating Welding Electrode, NESOI | $1.8M | 12.06% | 79.02% | $216K |
| 3810901000 | Fluxes & Oth Aux Prep Etc, Cont Gt 5% Wgt, Gt 1 Arm | $356K | 13.54% | 95.00% | $48K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 3810900000 | Fluxes & Oth Auxiliary Prep, Soldering, Etc, NESOI | $5.9M |
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.
Trade Directory
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