HS Code for Brazing flux

Brazing flux is classified under HS code 3810.90. This code falls within Chapter 38, which covers miscellaneous chemical products. Specifically, heading 3810 includes pickling preparations for metal surfaces and fluxes and other auxiliary preparations for soldering, brazing, or welding. Brazing flux is a chemical agent used to prevent oxidation during the joining of metals and to facilitate the flow of the filler metal. The subheading 3810.90 is a residual category for preparations other than those used for pickling metal or as cores/coatings for welding electrodes. These preparations can be in the form of powders, pastes, or liquids. The classification is determined by the chemical composition and the specific industrial application of the product in the metal-joining process.

Products Included

• Silver brazing flux powder
• Aluminum brazing flux paste
• Fluoride-based brazing fluxes
• Borax-based flux preparations
• Liquid flux for torch brazing

Common Misclassification

Brazing flux is often confused with HS code 3810.10, which is strictly for pickling preparations for metal surfaces (acidic solutions used to clean metal). Another common error is attempting to classify the flux under the HS code of the filler metal (such as silver solder in Chapter 71 or copper alloys in Chapter 74). However, chemical preparations used as fluxes must remain in Chapter 38. Additionally, welding electrodes that already contain flux as a core or coating are classified under 8311.

FAQ

What is the HS code for Brazing flux?

The HS code for brazing flux and similar auxiliary preparations is 3810.90.

Is solder wire with a flux core classified here?

No, solder wire with a flux core is typically classified under heading 8311 as wire or rods of base metal for soldering or welding.