Chemistry informtion about Cerium Fluoride (CAS NO.7758-88-5) is:
IUPAC Name: Trifluorocerium
Synonyms: Cerium Fluoride (Cef3) ; Cerium Fluorure ; Cerium(Iii)Fluorideanhydrous ; Ceriumfluoride(Cef3) ; Ceriumfluorure ; Cerium(+3)Fluoride ; Cerium(Iii) Fluoride ; Cerium Fluoride
MF: CeF₃
MW: 197.11
EINECS: 231-841-3
Density: 6.16 g/mL at 25 °C(lit.)
Flash Point: 2300°C
Melting Point: 1640 °C
Boiling Point: 19.5 °C at 760 mmHg
Vapour Pressure: 922 mmHg at 25°C 
Enthalpy of Vaporization: 25.54 kJ/mol 
Sensitive: Hygroscopic
Merck: 14,1998
Following is the molecular structure of Cerium Fluoride (CAS NO.7758-88-5) is:

Cerium Fluoride (CAS NO.7758-88-5) can be used to make lewis acid.

Reported in EPA TSCA Inventory.

Low toxicity by ingestion. See FLUORIDES and CERIUM COMPOUNDS. When heated to decomposition it emits toxic fumes of F⁻.
Safty information about Cerium Fluoride (CAS NO.7758-88-5) :
Hazard Codes:
Xi 
Xn
Risk Statements:
R36/37/38:Irritating to eyes, respiratory system and skin.  
R20/21/22:Harmful by inhalation, in contact with skin and if swallowed. 
Safety Statements:
S22:Do not breathe dust.  
S24/25:Avoid contact with skin and eyes. 
S37/39:Wear suitable gloves and eye/face protection. 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S36/37:Wear suitable protective clothing and gloves.
WGK Germany: 2
RTECS: FK6125000
Hazard Note: Irritant
HS Code: 28461000

OSHA PEL: TWA 2.5 mg(F)/m³
ACGIH TLV: TWA 2.5 mg(F)/m³; BEI: 3 mg/g creatinine of fluorides in urine prior to shift; 10 mg/g creatinine of fluorides in urine at end of shift.
NIOSH REL: (Inorganic Fluorides) TWA 2.5 mg(F)/m³

 Cerium Fluoride (CAS NO.7758-88-5) is a white hexagonal crystals, hygroscopic.
First Aid Measures:
Ingestion: If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid immediately.
Inhalation: Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
Skin: Get medical aid immediately. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse.
Eyes: Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately.
Handling and Storage:
Storage: Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.
Handling: Wash thoroughly after handling. Avoid contact with eyes, skin, and clothing. Avoid ingestion and inhalation. Use with adequate ventilation.