Polishing Grade Ceria for Precision Optics
Polishing Grade Ceria for Precision Optics is a calcined cerium oxide powder engineered for polishing telescope mirrors, laser optics, and ophthalmic lenses. It is classified under tariff item 2846.10.00 as a chemically defined cerium compound, meeting the criteria of Chapter 28 notes for inorganic compounds of rare-earth metals. The controlled particle distribution (1-3 microns) ensures consistent polishing performance without altering its chemical identity.
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 ceria is formulated with additives for specific polishing applications
Prepared polishing preparations with binders or suspending agents fall outside Chapter 28 as they are no longer chemically defined compounds.
If imported as part of a finished optical element
Optical elements incorporating ceria as a coating or component are classified in Chapter 90.
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
• Ensure the product is invoiced as pure cerium oxide with a certificate of analysis to confirm chemical definition
• Declare the end use (optical polishing) to the CBSA if requested, as it supports classification under 2846.10.00
• Verify whether the product contains any added binders or surfactants, which could shift classification
Related Products under Tariff item 2846.10.00
Ceric Ammonium Nitrate (CAN) Precursor Oxide
Cerium oxide processed as a precursor for ceric ammonium nitrate is a chemically defined cerium compound used in organic synthesis and glass polishing. It is classified under tariff item 2846.10.00 as a cerium compound, per Chapter 28 Note 1(a) for separate chemically defined compounds.
Cerium Acetylacetonate
Cerium(III) acetylacetonate is an organometallic cerium compound used in sol-gel processing and thin-film deposition. It is classified under tariff item 2846.10.00 as an organic compound of a rare-earth metal, specifically cerium, per Chapter 28 Note 2 which includes organic products of rare-earth metals in this chapter.
Cerium Ammonium Nitrate
Cerium ammonium nitrate is a double salt of cerium and ammonium, used as an oxidizing agent in organic synthesis. It is classified under tariff item 2846.10.00 as a cerium compound, and per Chapter 28 Note 5, double salts of rare-earth metals are included in this heading.
Cerium Carbonate Hydrate
Cerium carbonate hydrate is a basic cerium compound used in glass decolorizing and polishing applications. It falls under tariff item 2846.10.00 as a cerium compound, and Chapter 28 Note 2 permits carbonates of inorganic bases of rare-earth metals in this chapter.
Cerium Chloride (CeCl3) Anhydrous
Anhydrous cerium(III) chloride is a rare-earth metal salt used in chemical synthesis and as a precursor for cerium-based materials. It is classified under tariff item 2846.10.00 as a cerium compound, meeting the Chapter 28 definition of separate chemically defined compounds.
Cerium Dioxide Catalyst Grade
Cerium dioxide in nanoparticulate form optimized for automotive catalytic converters is a chemically defined cerium compound. It is classified under tariff item 2846.10.00 as a cerium compound, as particle size and optimization do not change its chemical definition per Chapter 28 Note 1(a).