Rare Earth Elements
REACH
Cerium Dioxide
CAS Number
1306-38-3
EC Number
215-150-4
What is Cerium Dioxide?
Cerium Dioxide (CAS 1306-38-3), also known as ceria, is a rare earth oxide sourced for its UV-absorbing and surface-modifying properties.
Where is Cerium Dioxide used?
- Personal care and cosmetics: incorporated into sunscreen and UV-protective formulations
- Printing and packaging: polishing compound for optical glass and precision-coated surfaces
- Specialty coatings and inks: pigment additive for color stability and surface uniformity
- In functional packaging materials it acts as a biocidal and antimicrobial agent.
Good to know: It absorbs ultraviolet radiation, offering an inorganic alternative to organic UV filters. Buyers should confirm particle size distribution and purity certification when sourcing for UV filter or polishing applications, as these parameters directly affect performance.
Commercial specifications
- Fine white powder in varying particle sizes, including nanoscale grades
- Technical and high-purity grades
- Purity levels typically 99% to 99.99%
Other Names (Synonyms)
Cerium(iv) oxide|Dioxocerium|Ceria
What are the physical properties of Cerium Dioxide?
Melting Point 2600 °C
Density 7.22 g/cm³ (solid) (nanoparticles)
Appearance white to faintly yellow powder
Color Yellow
Odor Odorless
Form powder
Water Solubility insoluble
pH ~2.7
How is Cerium Dioxide classified and handled safely? Learn More
Danger
GHS08· Health Hazard
Hazard Statements
H371 May cause damage to organs
H372 Causes damage to organs through prolonged or repeated exposure
Precautionary Statements
P260 Do not breathe dust/fume/gas/mist/vapours/spray.
P264 Wash … thoroughly after handling.
P270 Do not eat, drink or smoke when using this product.
P319 Get medical advice/attention if you feel unwell.
Which trade and regulatory codes apply to Cerium Dioxide?
HS Code 28461000
Storage Class 11 - Combustible Solids
WGK (Germany) 3