pH Correction Carbon Dioxide
Carbon dioxide gas for adjusting pH in wastewater treatment and aquaculture systems. Pure CO2 under HTS 2811.21.00.00 as it forms carbonic acid in solution, qualifying as an inorganic acid per Chapter 28.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If aqueous carbonic acid solutions
Prepared solutions >50% water enter 3824; gaseous pure CO2 stays 2811.
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Import Tips & Compliance
• Provide application data for environmental permits; test dissolution rates
• Avoid classifying as water treatment chemicals under 3824 if pure
• Monitor for microbial contamination in humid applications
Related Products under HTS 2811.21.00.00
Industrial Carbon Dioxide Gas Cylinder
High-purity carbon dioxide gas compressed in steel cylinders for industrial applications such as welding, beverage carbonation, and pH control in water treatment. Classified under HTS 2811.21.00.00 as carbon dioxide, a simple inorganic oxygen compound of nonmetals per Chapter 28 notes. It is chemically defined and not excluded by chapter provisions.
Liquid Carbon Dioxide Bulk Tanker
Liquid CO2 stored at -78°C for industrial refrigeration and fire suppression systems. HTS 2811.21.00.00 covers all physical states of carbon dioxide as an inorganic nonmetal oxygen compound.
Food-Grade CO2 for Beverage Carbonation
Ultra-high purity carbon dioxide (99.99%) used to carbonate soft drinks, beer, and sparkling water in the food and beverage industry. Falls under HTS 2811.21.00.00 as pure carbon dioxide, an inorganic oxygen compound of nonmetals, explicitly included in Chapter 28 note 2(a).
Dry Ice Blocks for Shipping
Solid carbon dioxide (dry ice) in block form used for perishable goods shipping and cryogenic applications. Classified as carbon dioxide under HTS 2811.21.00.00 since dry ice is the solid phase of CO2, a chemically defined inorganic compound per Chapter 28.
Medical-Grade Carbon Dioxide USP
Pharmaceutical-grade CO2 meeting USP standards for laparoscopic surgery insufflation and respiratory therapy. HTS 2811.21.00.00 applies as it is pure carbon dioxide, an inorganic oxygen compound excluded from pharmaceuticals in Chapter 30 by Section VI notes.
Welding Shielding Gas CO2
Pure carbon dioxide used as shielding gas in MIG/MAG welding to protect weld pools from atmospheric contamination. Classified under HTS 2811.21.00.00 as chemically defined carbon dioxide per Chapter 28 subheading note.