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Chemical Name: Cerium(IV) Oxide
Common Names: Ceric oxide, cerium dioxide
Chemical Formula: CeO2
Appearance: Pale yellow or white powder
Odor: Odorless
GHS Classification: Not classified as hazardous
Main Hazards: Dust stirring during handling could irritate the respiratory tract; prolonged inhalation may cause lung discomfort; in contact with eyes dust might prompt mild irritation; skin contact is often benign but can lead to dryness with extended exposure
Environmental Impact: Releases from handling or disposal have potential to accumulate in soils and water, giving rise to concerns about long-term biological effects
Ingredient: Cerium(IV) Oxide
Chemical Formula: CeO2
Purity: Often sold at greater than 99% purity as a single substance
Inhalation: Relocate to fresh air; seek medical attention if cough or shortness of breath persists
Eye Contact: Rinse under running water for several minutes; remove contact lenses to help the process if necessary
Skin Contact: Wash with soap and water; remove contaminated clothing; reuse clothes only after thorough washing
Ingestion: Rinse mouth and drink water; medical attention is advised if symptoms appear
Suitable Extinguishing Media: Use standard dry chemical, foam, or CO2 extinguishers
Specific Hazards: Combustion is not a concern as Cerium(IV) Oxide itself will not burn, but packaging or contamination can fuel a fire
Special Protective Equipment: Wear self-contained breathing apparatus and full protective gear to avoid inhaling smoke or particulates
Decomposition Products: Heating to extreme temperatures might cause release of unknown or possibly toxic metal fumes
Personal Precautions: Avoid breathing in dust; use appropriate personal protective equipment to limit exposure
Environmental Precautions: Prevent wind or water from dispersing powder into drains or surface water
Methods for Cleanup: Gather slow-moving spills with HEPA vacuum or damp sweeping; transfer into a closed container for proper disposal; avoid dry sweeping of large quantities that release unnecessary dust
Handling: Wear gloves and minimize dust generation. Conduct procedures in ventilated areas or under local exhaust to lower exposure risk. Turnover of storage containers helps spot leaks early, and avoiding rough handling keeps bags from splitting and producing airborne particles
Storage: Store in a tightly sealed container sheltered from moisture and strong acids; oxidizing substances should not be stored together. Keep product in a cool, dry area and limit access to trained personnel
Engineering Controls: Local exhaust ventilation or other engineering controls to keep airborne concentrations low
Exposure Limits: No ACGIH or OSHA limits for Cerium(IV) Oxide, but off-the-shelf recommendations suggest treating as nuisance dust (10 mg/m3 inhalable, 3 mg/m3 respirable)
Eye Protection: Use safety goggles to reduce risk from accidental splashes or airborne powder
Skin Protection: Wear gloves made of standard chemical-resistant material
Respiratory Protection: NIOSH-approved respirator or dust mask for airborne particles, especially in poorly ventilated spaces
Physical State: Powder
Color: Pale yellow or white
Melting Point: Around 2,600°C
Boiling Point: Not applicable under normal conditions
Solubility: Insoluble in water
Density: About 7.1 g/cm3
Odor: None
Other Properties: Stable in air and under expected laboratory or industrial conditions
Chemical Stability: Stable under normal temperatures and pressures; resists weathering
Conditions to Avoid: Avoid strong acids and bases; moisture can clump powder, making handling less safe
Incompatible Materials: Strong acids may break down the oxide; avoid sources of reducing agents
Hazardous Decomposition Products: At high temperatures, could produce cerium fumes or oxides of cerium
Acute Toxicity: Not listed as highly toxic to humans or animals in available toxicological reviews, but chronic exposure to dust has the potential to cause lung fibrosis with significant long-term exposure
Routes of Exposure: Inhalation, skin, eyes, ingestion
Chronic Effects: Long-term work in dusty environments with rare earths links to granulomatous lung changes, though studies for cerium dioxide are limited
Carcinogenicity: Not classified as a carcinogen by IARC, NTP, or OSHA
Other effects: Rare earth oxides in general can accumulate in the body over time, but low acute effects make short-term exposure less concerning than for many industrial powders
Ecotoxicity: Sparse evidence of high risk in the short term, though long-term deposition in water or sediment could disrupt aquatic systems
Mobility: Tends to settle out of water and accumulate in sediments
Persistence: Highly persistent in soil and water due to insolubility
Bioaccumulation: Some risk of uptake by aquatic organisms, uncertain ecosystem effects command careful waste management
Waste Treatment Methods: Collect in leak-proof, labeled containers for recycling or disposal; avoid scattering powder or mixing with general trash
Disposal: Handle as non-hazardous industrial waste unless contaminated; final determination often depends on local regulations governing rare earth elements
UN Number: Not regulated as a hazardous material for ground, air, or sea transport
Special Precautions: Secure containers to limit dust spread; use transport guidelines developed for industrial powders to avert accidental releases
OSHA: Not specifically regulated under hazardous substances codes
EPA: Substance is not listed under hazardous waste legislation, but state or local rules might call for additional controls
Other Notes: While international regulations do not flag cerium dioxide as dangerous, best practice recognizes dust as a nuisance and prompts control measures in occupational environments
