Cerium Dioxide
Ceric Oxide, Cerium(IV) Oxide, CeO2, Cerium White.
- CAS
- 1306-38-3
- EC
- 215-150-4
- Sectors
- Automotive, Electronics & Solar PV
Cerium Dioxide (CAS 1306-38-3) is a rare earth oxide composed of cerium and oxygen, supplied as a white to faintly yellow powder, and valued for its oxygen storage and redox behavior in automotive catalytic converters, precision glass polishing and Chemical Mechanical Planarization. It is available in various Optical Grades tailored for precision glass and semiconductor surface finishing.
This material serves as a vital oxygen storage component in automotive catalytic converters. Its unique redox properties allow it to release and absorb oxygen, significantly reducing harmful emissions in combustion engines.
In the electronics sector, it is utilized as a high-purity abrasive for Chemical Mechanical Planarization (CMP). It provides superior thermal stability and is essential in the production of solid oxide fuel cells.
Typical Properties
| Molecular formula | CeO2 |
|---|---|
| Molecular weight | 172.11 g/mol |
| Appearance | white to faintly yellow powder |
| Form | powder |
| Color | Yellow |
| Odor | Odorless |
| Melting point | 2600 °C |
| Density | 7.22 g/cm³ (solid) (nanoparticles) |
| Water solubility | insoluble |
| pH | ~2.7 |
| GHS signal word | Danger · Health hazard |
| HS code | 28461000 |
| Grades available | Electronic Grade |
Typical literature values for identification; lot-specific results are stated on the certificate of analysis (COA) and the safety data sheet (SDS) that accompany every delivery.
Cerium Dioxide
Applications
- Glass Polishing: The industry standard for high-precision polishing of optical lenses, mirrors, and smartphone screens.
- Catalysis: Used in automotive three-way catalysts (TWC) to facilitate the oxidation of carbon monoxide and hydrocarbons.
- UV Filtering: Incorporated into coatings and glass formulations to provide high-efficiency UV protection without compromising transparency.
Safety & Risks
Classified as a Mild Irritant for dust inhalation. Avoid breathing dust and ensure adequate ventilation. Use N95 Respirators, Safety Glasses, and Gloves to prevent prolonged exposure.
Packaging
25 kg Fiber Drums, 50 kg Iron Drums, or vacuum-sealed foil bags for high-purity electronic grades.