Boron Sesquioxide Fused Lump
Fused boric oxide lumps from thermal dehydration, used in specialty glass melting. The product is pure B2O3 in irregular shapes, meeting Chapter 28 Note 1(a). The fusion process does not alter the chemical identity, so it remains an oxide of boron.
Import Duty Rates by Country of Origin
| Origin Country | MFN Tariff | Surtaxes | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | Free | — | Free |
| 🇲🇽Mexico | Free | — | Free |
| 🇺🇸United States | Free | — | Free |
| 🇩🇪Germany | Free | — | Free |
| 🇯🇵Japan | Free | — | Free |
More Specific Codes
This product may fall under a more specific subheading:
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If the product is glass frit or other glass in powder, granules, or flakes
Glass frit and other glass forms are excluded from Chapter 28 by Note 3(d).
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right tariff item — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Confirm the product is not a glass frit, which would fall under heading 32.07
• Ensure the lumps are pure B2O3 without added fluxes
• Keep melting point data to support classification
Related Products under Tariff item 2810.00.00
Anhydrous Boric Oxide Powder
Anhydrous boric oxide (B2O3) is a white, glassy powder used in the production of borosilicate glass and as a flux in metallurgy. It is a separate chemically defined compound of boron, meeting the requirements of Chapter 28 Note 1(a). This tariff item covers oxides of boron, and this product is the anhydrous form of boric oxide.
Boric Acid 99.9% Electronics Grade
Ultra-pure boric acid for semiconductor doping and plasma etching solutions, with 99.9% purity. It is a separate chemically defined compound of boric acid, meeting Chapter 28 Note 1(a). The high purity does not remove it from the heading, as it is still boric acid.
Boric Acid Crystals (H3BO3)
Boric acid (H3BO3) is a weak, monobasic Lewis acid of boron available in white, odorless crystals or powder form, used as an antiseptic and in fire retardants. It is explicitly named in the tariff item as a boric acid. It is a separate chemically defined compound meeting Chapter 28 Note 1(a).
Boric Oxide Sintered Pellets
Sintered boric oxide pellets used in nuclear reactor control rods and high-temperature ceramics. The product is pure B2O3 formed into pellets without chemical change, still an oxide of boron. It meets Chapter 28 Note 1(a) as a separate chemically defined compound.
Boron Trioxide Glass-Grade Powder
High-purity boron trioxide powder designed for borosilicate glass production, providing thermal resistance properties. It is pure B2O3, an oxide of boron, meeting Chapter 28 Note 1(a). The product is not mixed with other substances, so it falls under this tariff item.
Granular Boric Acid for Insecticide
Granular boric acid specifically sized for roach and ant baits, acting as a stomach poison. It is pure boric acid before formulation into pesticides, meeting Chapter 28 Note 1(a). The granular form does not change its chemical identity, so it falls under this tariff item.