HS Code for Soldering flux

Soldering flux and other auxiliary preparations for soldering, brazing, or welding are classified under HS code 3810.90. This classification is found within Chapter 38, which covers miscellaneous chemical products. The logic for this classification is based on the chemical nature of the product and its role as a processing aid. Flux is essential in metal joining processes because it removes oxides from the surfaces of the metals to be joined, prevents further oxidation during the heating process, and promotes the flow of the filler metal. HS code 3810.90 is a residual category for preparations that do not fall under the more specific 3810.10, which is for pickling preparations for metal surfaces. It includes a variety of forms, such as pastes, liquids, and powders, and can be based on rosin, organic acids, or inorganic salts. Correct classification is vital for compliance with chemical safety regulations.

Products Included

• Rosin-based soldering flux
• Acid-core soldering flux
• Soldering paste containing flux
• Brazing powders and fluxes
• Welding electrode coatings (auxiliary)

Common Misclassification

Soldering flux is often confused with HS code 3810.10, which is strictly for pickling preparations used to clean metal surfaces before processing. While both involve surface treatment, 3810.90 is specific to the act of soldering or welding. Additionally, flux-cored solder wire is often misclassified here, but it should actually be classified under 8311 or 8003 depending on the metal composition.

FAQ

What is the HS code for soldering flux?

The HS code for soldering, brazing, or welding flux preparations is 3810.90.

Is solder wire included in this HS code?

No, solder wire (even if it contains a flux core) is classified under the heading for the base metal, such as 8003.00 for tin or 8311 for base metal electrodes.