Consisting wholly of inorganic substances
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: > Consisting wholly of inorganic substances
Duty Rate (from China)
Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
Products classified under HTS 3810.90.20.00
Sodium Bisulfate Metal Pickling Solution
Aqueous solution of sodium bisulfate used to remove rust and scale from steel surfaces prior to painting or galvanizing. Classified under HTS 3810.90.2000 as a pickling preparation consisting wholly of inorganic substances like sodium bisulfate, water, and mineral acids. It prepares metal for further processing without organic additives.
Hydrochloric Acid Metal Descaling Bath
Concentrated hydrochloric acid solution for descaling ferrous metals in industrial pickling lines. Falls under 3810.90.2000 as a wholly inorganic pickling preparation essential for metal surface cleaning before fabrication. Used in steel mills without any organic components.
Boric Acid Welding Flux Powder
Fine powder of boric acid and borates used as flux for oxyacetylene brazing of steel parts. Wholly inorganic composition prevents oxidation during high-heat joining, classified in 3810.90.2000 as auxiliary preparation for soldering/brazing. Common in HVAC repair.
Potassium Fluoride Metal Cleaning Salt
Fused salt mixture of potassium fluoride and sodium fluoride for electrolytic metal cleaning. Wholly inorganic preparation etches surfaces before plating, classified 3810.90.2000 as auxiliary for metal treatment. Used in aerospace finishing.
Sodium Silicate Welding Electrode Coating
Liquid sodium silicate binder for coating welding electrodes with inorganic minerals. Provides arc stability and slag formation, qualifying as 3810.90.2000 preparation for welding electrodes. Essential for SMAW rods.
Magnesium Chloride Flux for Aluminum Brazing
Anhydrous magnesium chloride with alkali chlorides for torch brazing aluminum heat exchangers. Inorganic flux mixture melts at 650°C to clean oxide layer, under 3810.90.2000. Automotive radiator production staple.
Ammonium Persulfate Copper Pickling Powder
Crystalline ammonium persulfate used to pickle copper strip before plating. Inorganic oxidizer removes tarnish without acid attack, fitting 3810.90.2000 for metal surface preparations. Electronics circuit board production.
Sodium Nitrite Welding Flux Activator
Powdered sodium nitrite incorporated in inorganic fluxes for stainless steel welding. Enhances oxide removal at arc temperatures, wholly inorganic under 3810.90.2000. Pipeline and pressure vessel fabrication.
Electrolytic Alkaline Cleaning Salt
Blend of sodium hydroxide, sodium carbonate, and silicates for electrolytic metal cleaning tanks. Inorganic salts generate hydrogen to scrub surfaces, classified 3810.90.2000 as pickling preparation. Automotive stamping lines.
Fluoroboric Acid Aluminum Etchant
Aqueous fluoroboric acid solution for precision etching of aluminum semiconductor parts. Inorganic acid provides uniform attack rate for microfabrication, under 3810.90.2000 pickling preparations. Electronics industry.
Titanium Pickling Paste (Inorganic)
Thick paste of nitric and hydrofluoric acids for on-site pickling of titanium welds. Inorganic gelling with silica, classified 3810.90.2000 for metal surface preparation. Offshore oil platform construction.
Phosphoric Acid Rust Converter Gel
Thickened phosphoric acid gel for converting rust on iron surfaces to stable phosphate layer. Consists solely of inorganic phosphoric acid, phosphates, and silicates, qualifying for 3810.90.2000 as metal pickling preparation. Applied in maintenance for structural steel.
Sodium Cyanide Silver Soldering Flux
Anhydrous sodium cyanide-based flux for silver soldering jewelry and electronics. Inorganic salts dissolve oxides at soldering temperatures, fitting 3810.90.2000 for wholly inorganic auxiliary preparations. Highly toxic, used in precision assembly.
Zinc Chloride Soldering Flux Paste
Water-based paste of zinc chloride and ammonium chloride for soldering galvanized steel. Acts as inorganic flux to clean surfaces during electrical connections, under 3810.90.2000. Residue must be washed post-use.
Chromic Acid Metal Etching Solution
Dilute chromic acid with sulfuric acid for etching titanium alloys before anodizing. Wholly inorganic preparation selectively removes oxide films, classified 3810.90.2000 as pickling auxiliary. Aerospace and medical implant use.