Chapter 3810 — Customs Tariff Headings
Subheadings
Products classified under Tariff item 38.10
Aluminum Brazing Flux Paste
Aluminum brazing flux paste, chloride-free, formulated for torch brazing aluminum heat exchangers in automotive radiators. It contains fluorides that remove the aluminum oxide layer during brazing, qualifying as an auxiliary preparation for soldering or brazing under tariff item 3810.10.00.
3810.10.00Brass Brazing Paste with Silver
Brass brazing paste alloyed with silver, used for plumbing fittings and marine hardware. It consists of metal powders suspended in a flux binder, providing high fluidity for capillary action, and falls under tariff item 3810.10.00 as a brazing paste of metal and other materials.
3810.10.00Citric Acid Stainless Steel Passivation Gel
Citric acid-based thixotropic gel for passivating stainless steel welds and surfaces, removing free iron without chlorides. It acts as a pickling preparation that restores the chromium oxide layer, meeting the description of tariff item 3810.10.00.
3810.10.00Copper Phosphorus Brazing Paste
Self-fluxing copper-phosphorus brazing paste for copper-nickel heat exchanger tubes, containing 7% phosphorus for fluxing during brazing at 700-850°C. It is a brazing paste of metal with auxiliary material, classifiable under tariff item 3810.10.00.
3810.10.00Hydrochloric Acid Metal Pickling Solution
Concentrated hydrochloric acid-based solution formulated to remove rust and scale from steel surfaces before painting or galvanizing. It is a pickling preparation specifically for metal surfaces, falling under tariff item 3810.10.00.
3810.10.00Laser Welding Flux Powder
Nano-particle flux powder optimized for laser beam welding of thin stainless steel sheets, preventing oxidation and reducing porosity. It is an auxiliary preparation for welding, classifiable under tariff item 3810.10.00.
3810.10.00Mild Steel MIG Welding Powder Flux
Granular flux powder for gasless MIG welding of mild steel, containing metal powders and deoxidizers for arc stability. It is a welding powder consisting of metal and auxiliary materials, falling under tariff item 3810.10.00.
3810.10.00Nitric-Hydrofluoric Acid Pickling Blend
Pre-mixed nitric and hydrofluoric acid solution for pickling titanium aerospace components, formulated for selective oxide removal on reactive metals. It is a pickling preparation for metal surfaces, classifiable under tariff item 3810.10.00.
3810.10.00Phosphoric Acid Metal Descaling Paste
Thick paste containing phosphoric acid for descaling and derusting aluminum and stainless steel surfaces in aerospace and automotive repair. It acts as a pickling preparation for metal surfaces, meeting the description of tariff item 3810.10.00.
3810.10.00Silver Solder Paste 56% Ag Flux Core
Pre-mixed silver solder paste with 56% silver content and integrated flux for HVAC and refrigeration brazing applications. It is a soldering paste consisting of metal alloys and flux materials, falling under tariff item 3810.10.00.
3810.10.00Sulfuric Acid Steel Pickling Bath Inhibited
Inhibited sulfuric acid solution for continuous steel pickling lines in pipe and sheet manufacturing, preventing excessive base metal attack. It is a specialized pickling preparation for ferrous metals, classifiable under tariff item 3810.10.00.
3810.10.00TIG Welding Electrode Core Powder
Metal powder blend used as extruded cores for TIG welding electrodes, containing tungsten carbide for hardfacing in oilfield applications. It is a preparation used as cores for welding electrodes, falling under tariff item 3810.10.00.
3810.90.00Ammonium 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.
3810.90.00Aromatic-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.
3810.90.00Aromatic 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.
3810.90.00Aromatic 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.
3810.90.00Benzene 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.
3810.90.00Boric 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.
3810.90.00Chromic 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.
3810.90.00Electrolytic 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.
3810.90.00Fluoroboric 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.
3810.90.00High-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.
3810.90.00Modified 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.
3810.90.00Naphthalene-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.
3810.90.00Styrene-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.
3810.90.00Toluene-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.
3810.90.00Xylene 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.