Molybdenum oxide

  • Molybdenum trioxide
  • Molybdenum(VI) oxide
Formula
MoO3
Structure
Description
Colorless to white or yellow odorless solid.
Uses
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.
CAS
1313-27-5
EC (EINECS/ELINCS)
215-204-7
EC Index Number
042-001-00-9
EC Class
Harmful; Irritant
R 36/37 48/20/22
RTECS
QA4725000
RTECS class
Tumorigen; Mutagen; Human Data
UN (DOT)
3288
Merck
12,6321
Beilstein/Gmelin
15492 (G)
Swiss Giftliste 1
G-4025
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed

Properties.
Formula
MoO3
Formula mass
143.94
Melting point, °C
795
Boiling point, °C
1155
Vapor pressure, mmHg
1003 (955 C)
Density
4.69 g/cm3
Solubility in water
500 mg/L
Heat of fusion
52.5 kJ/mol

Hazards and Protection.
Storage
Store in a cool, dry, well-ventilated area away from incompatible substances.
Handling
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.
Protection
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.
Respirators
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.
Small spills/leaks
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.
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Bromine trifluoride, chlorine trifluoride, lithium, magnesium, potassium, sodium, strong oxidizing agents, strong acids.
Decomposition
None.

Fire.
Fire fighting
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.
Fire potential
Non-Combustible
Hazards
Flash point data for this chemical are not available, but it is probably non-flammable.
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.
Health
2
 
Flammability
0
 
 
Reactivity
0
 

Health.
Poison_Class
3
Exposure effects
Possible cancer hazard based on tests with laboratory animals. Prolonged or repeated eye contact may cause conjunctivitis.
   Ingestion
Harmful if swallowed. May cause irritation of the digestive tract.
   Inhalation
May cause respiratory tract irritation.
   Skin
May cause skin irritation.
   Eyes
May cause eye irritation.

First aid
 
   Ingestion
If victim is conscious and alert, give 2-4 cupfuls of milk or water. 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. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.
   Eyes
Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately.

Transport.
UN number
3288
Response guide
Hazard class
6.1
Packing Group
I; II; III
 
USCG CHRIS Code
MTO
 
HS Code
2825 70 00