Pickling preparations for metal surfaces; fluxes and other auxiliary preparations for soldering, brazing or welding; soldering, brazing or welding powders and pastes consisting of metal and other materials; preparations of a kind used as cores or coatings for welding electrodes or rods
4 declarable lines
Heading 3810 covers chemical preparations used with metal: pickling preparations for cleaning metal surfaces, fluxes and auxiliary preparations for soldering, brazing or welding, metal-bearing soldering and brazing powders and pastes, and preparations used as cores or coatings for welding electrodes. The heading splits first at 3810.10, which takes pickling preparations and metal-containing soldering, brazing or welding powders and pastes. Everything else falls in 3810.90, split by aromatic content, then by whether the preparation consists wholly of inorganic substances, then a residual line.
Products in this heading
- Soldering flux paste for electronics repair
- Brazing flux powder for copper pipe joints in HVAC work
- Stainless steel pickling solution for weld cleanup and descaling
- Solder paste made of metal powder blended with flux for reflow
- Coating mixture applied to welding electrode coatings
- Core powder used inside flux-cored welding wire
- Aluminum brazing flux for heat exchanger assembly
- Tinning paste used to prepare metal surfaces before soldering
How to choose the right subheading
- Decide whether the product is a pickling preparation for metal surfaces, or a soldering, brazing or welding powder or paste containing metal: those go in 3810.10.00.00.
- If it is another flux or auxiliary preparation, or an electrode core or coating preparation, start at 3810.90.
- Test aromatic content: 5% or more by weight of one or more aromatic or modified aromatic substances gives 3810.90.10.00.
- If the preparation consists wholly of inorganic substances, use 3810.90.20.00.
- If neither test is met, the residual line 3810.90.50.00 applies.
Often confused with
- Heading 3806Unmodified rosin used as a soldering flux
Rosin and resin acids are covered by heading 3806; 3810 takes flux preparations, not the raw rosin itself.
- Heading 3816Refractory mortar for lining a brazing furnace
Refractory cements and mortars are classified in 3816, not as brazing auxiliaries.
- Heading 3801Graphite paste used as a mold release or lubricant
Preparations based on graphite in paste form belong to heading 3801.
- Heading 3824General purpose metal cleaning or degreasing preparation
Chemical preparations not covered by a specific heading fall in the residual heading 3824.
Frequently asked questions
What is the HTS code for soldering flux?
Fluxes for soldering fall in 3810.90. A flux consisting wholly of inorganic substances is 3810.90.20.00 at a general (MFN) rate of Free. A flux containing 5% or more by weight of aromatic or modified aromatic substances is 3810.90.10.00 at a general (MFN) rate of 6.5%.
What is the duty on solder paste?
Soldering powders and pastes consisting of metal and other materials are classified in 3810.10.00.00, which carries a general (MFN) rate of 5%.
How do I classify a coating for welding electrodes?
Preparations of a kind used as cores or coatings for welding electrodes are classified in heading 3810. If the preparation consists wholly of inorganic substances it goes in 3810.90.20.00 at a general (MFN) rate of Free; other such preparations go in 3810.90.50.00 at a general (MFN) rate of 5%.
Guide written from the official schedule text. Rates quoted are general (MFN) rates; check the line page for trade agreement rates and the classification of your exact product.
All lines in heading 3810
- 3810.10.00.00Pickling preparations for metal surfaces; soldering, brazing or welding powders and pastes consisting of metal and other materials5%
- 3810.90.10.00Containing 5 percent or more by weight of one or more aromatic or modified aromatic substances6.5%
- 3810.90.20.00Consisting wholly of inorganic substancesFree
- 3810.90.50.00Other5%