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HSChapter 38
U.S. imports of fluxes & other auxiliary preparations for soldering, brazing, or welding; prepared welding electrode cores & coatings (HS 381090) totaled $4.7M in May 2026, traded with 27 countries.
Importers of Fluxes & Other Auxiliary Preparations for Soldering, Brazing, or Welding; Prepared Welding Electrode Cores & Coatings paid $520K in duties in May 2026 — an effective duty rate of 12% on $4.2M in dutiable value, based on actual customs collections rather than the published tariff schedule. Fluxes & Other Auxiliary Preparations for Soldering, Brazing, or Welding; Prepared Welding Electrode Cores & Coatings imports of $4.7M in May 2026 ran 12% above the year-to-date monthly average of $4.2M.
Last updated: May 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.
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.
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Monthly import values over time
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 3810905000 | PREP USED AS CORES/COATING WELDING ELECTRODE,NESOI | $2.2M | 13.75% | 77.42% | $301K |
| 3810902000 | FLUXES & OTH AUXILARY PREP, OF INORGANIC SUBSTANCE | $1.6M | 10.55% | 97.17% | $172K |
| 3810901000 | FLUXES & OTH AUX PREP ETC,CONT GT 5% WGT,GT 1 ARM | $162K | 15.38% | 84.82% | $25K |
PREP USED AS CORES/COATING WELDING ELECTRODE,NESOI
FLUXES & OTH AUXILARY PREP, OF INORGANIC SUBSTANCE
FLUXES & OTH AUX PREP ETC,CONT GT 5% WGT,GT 1 ARM
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 3810900000 | FLUXES & OTH AUXILIARY PREP, SOLDERING, ETC, NESOI | $6.1M |
FLUXES & OTH AUXILIARY PREP, SOLDERING, ETC, NESOI
932.5K kg
PRODUCTS AND RESIDUALS OF CHEMICAL INDUSTRY, NESOI
HS 382499
DIAGNOSTIC OR LABORATORY REAGENTS INCL KITS, NESOI
HS 382219
CHEM ELEM DOPED, USED IN ELECTRON, DISCS WAFERS ET
HS 381800
SUPPORTED CATALYSTS W PREC METAL/PREC MTL COMPND
HS 381512
SUPPORTED CATALYSTS, NESOI
HS 381519
ADDITIVE FOR LUB OIL CONT PETRO/BITUMINOUS MINOIL
HS 381121
| State | Imports | Exports | Balance |
|---|---|---|---|
| Ohio | $1.3M | $1.3M | +$50K |
| California | $648K | $468K | -$180K |
| Texas | $450K | $587K | +$137K |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| YSLETA, TX | -- | $1.1M | +$1.1M |
| LAREDO, TX | $235K | $643K | +$408K |
| BUFFALO-NIAGARA FALLS, NY | $23K | $701K | +$678K |