- Molybdenum trioxide
- Molybdenum(VI) oxide
Colorless to white or yellow odorless solid.
Pure molybdenum trioxide is used in chemical and catalyst manufacture and the technical product is added to steel as an alloying agent.
Registry Numbers and Inventories.
EC Index Number
R 36/37 48/20/22
S 22 25
Tumorigen; Mutagen; Human Data
Swiss Giftliste 1
Japan ENCS (MITI)
Melting point, °C
Boiling point, °C
Vapor pressure, mmHg
1003 (955 C)
Solubility in water
Heat of fusion
Hazards and Protection.
Store in a cool, dry, well-ventilated area away from incompatible substances.
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use with adequate ventilation. Minimize dust generation and accumulation. Keep container tightly closed. Do not get on skin or in eyes. Do not ingest or inhale.
Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.
Wear a self contained breathing apparatus and appropriate Personal protection. (See Exposure Controls, Personal Protection section). Carefully scoop up and place into appropriate disposal container.
Stable under normal temperatures and pressures.
Bromine trifluoride, chlorine trifluoride, lithium, magnesium, potassium, sodium, strong oxidizing agents, strong acids.
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Extinguishing media: For small fires, use water spray, dry chemical, carbon dioxide or chemical foam.
Flash point data for this chemical are not available, but it is probably non-flammable.
Fire may produce irritating, corrosive and/or toxic gases.
Possible cancer hazard based on tests with laboratory animals. Prolonged or repeated eye contact may cause conjunctivitis.
Harmful if swallowed. May cause irritation of the digestive tract.
May cause respiratory tract irritation.
May cause skin irritation.
May cause eye irritation.
If victim is conscious and alert, give 2-4 cupfuls of milk or water. Get medical aid immediately.
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.
Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately.
I; II; III
USCG CHRIS Code
2825 70 00