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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If pure phosphoric acid shipment
Single inorganic chemical classified in Chapter 28, not as prepared metal treatment.
If functions primarily as paint primer
Rust converters with coating properties may shift to Chapter 32 paints and varnishes.
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Import Tips & Compliance
• Submit FTIR analysis proving no organic thickeners; silica-based only allowed
• Include REACH-like documentation for phosphate compounds if from EU
Related Products 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.