Other
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. > Other > Other
Duty Rate (from China)
Subheadings
Products classified under Tariff item 3810.90.00
Ammonium Persulfate Copper Pickling Powder
Crystalline ammonium persulfate used to pickle copper strip before plating, acting as an inorganic oxidizer to remove tarnish without acid attack. This product is a pickling preparation for metal surfaces, classified under tariff item 3810.90.00 as 'Other' preparations.
Anti-Spatter Welding Spray
A silicone-free aerosol spray that prevents weld spatter adhesion to fixtures and torches. This product is classified under tariff item 3810.90.00 as an auxiliary preparation for welding, improving productivity in MIG/TIG operations. It is non-toxic and easy to apply.
Aromatic-Enhanced Steel Pickling Solution
A liquid pickling preparation designed to clean steel surfaces prior to fabrication, containing over 5% aromatic hydrocarbons such as benzene derivatives to enhance rust removal and surface activation. This product falls under tariff item 3810.90.00 as a pickling preparation for metal surfaces, which is included in the heading for auxiliary preparations for soldering, brazing or welding.
Aromatic Pickling Inhibitor for Steel
An additive concentrate with aromatic amines exceeding 5%, used in acid pickling baths to prevent hydrogen embrittlement on steel strip. This product is an auxiliary preparation for metal surface pickling, falling under tariff item 3810.90.00 as 'Other' preparations for pickling, soldering, brazing or welding.
Aromatic Welding Electrode Coating Powder
A powder used as a coating for MIG welding electrodes, incorporating modified aromatic resins over 5% by weight for arc stability and slag formation control. This product is an auxiliary preparation for welding, classified under tariff item 3810.90.00 as 'Other' preparations for welding electrodes or rods.
Benzene Derivative Soldering Paste for Electronics
A high-aromatic soldering paste containing over 5% benzene-based modifiers, used for surface-mount electronics assembly to provide flux action and solder alloy dispersion. This product is an auxiliary preparation for soldering, falling under tariff item 3810.90.00 as 'Other' preparations in the heading.
Boric Acid Welding Flux Powder
A fine powder of boric acid and borates used as flux for oxyacetylene brazing of steel parts, with a wholly inorganic composition that prevents oxidation during high-heat joining. This product is an auxiliary preparation for brazing, falling under tariff item 3810.90.00 as 'Other' preparations.
Braze Paste with Flux for Copper
A pre-mixed paste containing copper phosphorus brazing alloy and borax flux for refrigeration tubing. This product is classified under tariff item 3810.90.00 as an auxiliary brazing preparation, though it is borderline with complete pastes. It provides self-fluxing properties during brazing.
Brazing Stop-Off Paint
A refractory paint applied to mask areas during vacuum brazing of turbine blades. This product is classified under tariff item 3810.90.00 as an auxiliary brazing preparation, withstanding high temperatures without metal contamination. It is removed by water blasting after the brazing cycle.
Chromic Acid Metal Etching Solution
A dilute chromic acid with sulfuric acid for etching titanium alloys before anodizing, selectively removing oxide films. This product is a pickling preparation for metal surfaces, classified under tariff item 3810.90.00 as 'Other' preparations.
Citric Acid Passivation Solution
A chelated citric acid solution for stainless steel passivation after pickling operations. This product is classified under tariff item 3810.90.00 as a metal surface preparation following pickling, restoring the chromium oxide layer. It is an environmentally friendly alternative to nitric acid.
Descaling Powder for Metal
A blended powder of sulfamic acid, phosphates, and inhibitors for immersion descaling of heat exchanger tubes. This product is classified under tariff item 3810.90.00 as a metal pickling preparation, dissolving calcium and magnesium scale without hydrogen embrittlement.
Electrolytic Alkaline Cleaning Salt
A blend of sodium hydroxide, sodium carbonate, and silicates for electrolytic metal cleaning tanks, generating hydrogen to scrub surfaces. This product is a pickling preparation for metal surfaces, falling under tariff item 3810.90.00 as 'Other' preparations.
Fluoroboric Acid Aluminum Etchant
An aqueous fluoroboric acid solution for precision etching of aluminum semiconductor parts, providing a uniform attack rate for microfabrication. This product is a pickling preparation for metal surfaces, classified under tariff item 3810.90.00 as 'Other' preparations.
Flux Paste for Aluminum Brazing
A chloride-based flux paste used to clean and protect aluminum surfaces during high-temperature brazing operations. It prevents oxidation and ensures strong, reliable joints. This product is classified under tariff item 3810.90.00 as an auxiliary preparation for brazing.
High-Aromatic Silver Solder Flux
A specialty flux for silver-based soldering of jewelry and instruments, containing over 5% aromatic activators for superior cleanability. This product is an auxiliary preparation for soldering, classified under tariff item 3810.90.00 as 'Other' preparations for soldering.
Hydrochloric Acid Metal Descaling Bath
A concentrated hydrochloric acid solution formulated for descaling ferrous metals in industrial pickling lines. This wholly inorganic preparation is essential for cleaning metal surfaces before fabrication or coating, and is classified under tariff item 3810.90.00 as a pickling preparation for metal surfaces.
Magnesium Chloride Flux for Aluminum Brazing
An anhydrous magnesium chloride flux blended with alkali chlorides, used for torch brazing aluminum heat exchangers. This inorganic flux mixture melts at approximately 650°C to remove the oxide layer, making it an auxiliary preparation for brazing under tariff item 3810.90.00.
Metal Pickling Solution for Steel
A hydrochloric acid-based solution designed to remove rust and scale from steel surfaces prior to further processing. It is a pickling preparation specifically for metal surfaces, used in industrial cleaning and surface treatment. This product falls under tariff item 3810.90.00 as a pickling preparation for metal surfaces.
MIG Welding Gasless Flux Core
A powdered flux formulation for gasless MIG wire, providing shielding and deoxidizers for welding. It enables outdoor structural welding without external gas supply. This product is classified under tariff item 3810.90.00 as a preparation for welding electrodes or rods.
Modified Aromatic Metal Welding Flux Core
A flux core wire filler material with modified aromatic compounds exceeding 5%, used for flux-cored arc welding of structural steel. This product is an auxiliary preparation for welding, falling under tariff item 3810.90.00 as 'Other' preparations for welding.
Naphthalene-Based Welding Rod Coating
A coating slurry for covered welding rods using naphthalene derivatives over 5% aromatics for moisture resistance and gas shielding. This product is an auxiliary preparation for welding, classified under tariff item 3810.90.00 as 'Other' preparations for welding electrodes or rods.
Phosphoric Acid Metal Pickler
A gel-formulation phosphoric acid pickler for rust conversion and surface preparation on ferrous metals. It is ideal for on-site maintenance and restoration work. This product falls under tariff item 3810.90.00 as a metal surface pickling preparation.
Phosphoric Acid Rust Converter Gel
A thickened phosphoric acid gel that converts rust on iron surfaces into a stable phosphate layer. Composed solely of inorganic phosphoric acid, phosphates, and silicates, this product qualifies as a metal pickling preparation under tariff item 3810.90.00.
Potassium Fluoride Metal Cleaning Salt
A fused salt mixture of potassium fluoride and sodium fluoride used for electrolytic metal cleaning. This wholly inorganic preparation etches surfaces before plating and is classified under tariff item 3810.90.00 as an auxiliary preparation for metal treatment.
Rust Remover Pickling Gel
A thixotropic gel containing hydrofluoric and sulfuric acids for vertical surface rust removal on stainless steel. It prevents drips during tank and vessel maintenance. This product is classified under tariff item 3810.90.00 as a metal pickling preparation.
Silver Solder Flux for Electronics
A rosin-activated liquid flux optimized for silver-based soldering in circuit board assembly. It provides clean joints without residue in precision electronics work. This product falls under tariff item 3810.90.00 as an auxiliary preparation for soldering.
Sodium Bisulfate Metal Pickling Solution
An aqueous solution of sodium bisulfate used to remove rust and scale from steel surfaces prior to painting or galvanizing. This pickling preparation consists wholly of inorganic substances and is classified under tariff item 3810.90.00.
Sodium Cyanide Silver Soldering Flux
An anhydrous sodium cyanide-based flux for silver soldering jewelry and electronics. The inorganic salts dissolve oxides at soldering temperatures, fitting tariff item 3810.90.00 as a wholly inorganic auxiliary preparation for soldering. This product is highly toxic and requires careful handling.
Sodium Nitrite Welding Flux Activator
Powdered sodium nitrite incorporated into inorganic fluxes for stainless steel welding. This product enhances oxide removal at arc temperatures and is wholly inorganic, qualifying under tariff item 3810.90.00 as an auxiliary preparation for welding. It is commonly used in pipeline and pressure vessel fabrication.
Sodium Silicate Welding Electrode Coating
A liquid sodium silicate binder used for coating welding electrodes with inorganic minerals. This preparation provides arc stability and slag formation, qualifying under tariff item 3810.90.00 as a preparation for coating welding electrodes. It is essential for the production of shielded metal arc welding (SMAW) rods.
Soldering Powder Flux for Lead-Free
An ammonium chloride-zinc chloride powder flux for lead-free solder joints in plumbing fixtures. It is activated for tin-silver-copper alloys and is water-soluble for post-soldering cleanup. This product is classified under tariff item 3810.90.00 as an auxiliary preparation for soldering.
Styrene-Enhanced Brass Brazing Flux
A liquid flux for brazing brass fittings containing styrene derivatives over 5% aromatics to improve wetting and capillary action. This product is an auxiliary preparation for brazing, falling under tariff item 3810.90.00 as 'Other' preparations for brazing.
TIG Welding Flux for Stainless Steel
A fluoride-based flux powder for Gas Tungsten Arc Welding (TIG) of stainless steel, enabling oxide-free welds. It is specifically designed for high-alloy metals requiring precise welding conditions. This product falls under tariff item 3810.90.00 as an auxiliary preparation for welding.
Titanium Pickling Paste (Inorganic)
A thick paste of nitric and hydrofluoric acids for on-site pickling of titanium welds. This inorganic preparation is gelled with silica and is classified under tariff item 3810.90.00 for metal surface preparation. It is widely used in offshore oil platform construction.
Toluene-Based Aluminum Pickling Paste
A thick paste formulation with toluene exceeding 5% by weight, used for pickling aluminum alloys to remove oxide layers before anodizing. This product is a pickling preparation for metal surfaces, classified under tariff item 3810.90.00 as 'Other' preparations.
Weld Backing Flux Tape
An adhesive tape impregnated with ceramic flux for root pass backing in pipe welding. It provides gas shielding without purging and dissipates completely after welding. This product is classified under tariff item 3810.90.00 as an auxiliary preparation for welding.
Welding Electrode Coating Powder
A powdered mixture of silicates, carbonates, and ferroalloys applied as coatings to welding electrodes for arc stability and slag formation. It qualifies as a preparation used as cores or coatings for welding electrodes. This product falls under tariff item 3810.90.00.
Xylene Flux for Brazing Copper Pipes
A flux preparation containing xylene isomers over 5% aromatic content for brazing copper plumbing pipes, preventing oxidation during high-heat joining. This product is an auxiliary preparation for brazing, falling under tariff item 3810.90.00 as 'Other' preparations.
Zinc Chloride Soldering Flux Paste
A water-based paste of zinc chloride and ammonium chloride used for soldering galvanized steel. This inorganic flux cleans surfaces during electrical connections and is classified under tariff item 3810.90.00. Residue must be washed off after use.