Molybdenum

Formula
Mo
Structure
Description
Dark-gray or black powder with metallic luster or coherent mass of silver
Uses
Resistance elements for electric furnaces, electric & electronic components, wear resistant coatings for machine & engine parts, electrodes for glass industry, machine tool accessories (eg, boring bars, grinding quills).

Registry Numbers and Inventories.
CAS
7439-98-7
EC (EINECS/ELINCS)
231-107-2
RTECS
QA4680000
RTECS class
Mutagen; Reproductive Effector
UN (DOT)
3089
Merck
12,6317
Beilstein/Gmelin
16205 (G)
Swiss Giftliste 1
G-9575
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Korea ECL
Listed

Properties.
Formula
C36H72Br4F6Mo2N2O4
Formula mass
95.94
Melting point, °C
2622
Boiling point, °C
3617
Density
10.28 g/cm3 (20 C)
Solubility in water
Insoluble
Thermal expansion
3.6E-6/K (20 C)
Heat of fusion
26.2 kJ/mol
Heat of vaporization
611.1 kJ/mol

Hazards and Protection.
Storage
Keep away from heat, sparks, and flame. Keep away from sources of ignition.
Handling
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Minimize dust generation and accumulation. Avoid contact with eyes, skin, and clothing. Empty containers retain product residue, (liquid and/or vapor), and can be dangerous. Avoid contact with heat, sparks and flame. Avoid ingestion and inhalation. Do not pressurize, cut, weld, braze, solder, drill, grind, or expose empty containers to heat, sparks or open flames.
Protection
Eyes: Wear safety glasses and chemical goggles if splashing is possible. 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
A respiratory protection program that meets OSHA's 29 CFR 1910.134 and ANSI Z88.2 requirements or European Standard EN 149 must be followed whenever workplace conditions warrant a respirator's use.
Small spills/leaks
Sweep up, then place into a suitable container for disposal. Scoop up with a nonsparking tool, then place into a suitable container for disposal. Avoid generating dusty conditions. Remove all sources of ignition.
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Strong oxidizing agents, chlorine trifluoride, fluorine, lead dioxide, nitric acid, sulfuric acid.
Decomposition
Irritating and toxic fumes and gases.

Fire.
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Dust can be an explosion hazard when exposed to heat or flame. Flammable solid. May burn rapidly with flare burning effect. May re-ignite after fire is extinguished. Runoff to sewer may create fire or explosion hazard. Extinguishing media: Do NOT use water directly on fire. For large fires, use water spray, fog or regular foam. Contact professional fire-fighters immediately. For small fires, use dry chemical, carbon dioxide, sand, earth, water spray or regular foam. Cool containers with flooding quantities of water until well after fire is out.
Fire potential
Moderately flammable. Combustion with moderate heating.
Hazards
Oxides from metallic fires are a severe health hazard. Fire may produce irritating, corrosive and/or toxic gases.
Health
1
 
Flammability
3
 
 
Reactivity
0
 

Health.
Exposure limit(s)
NIOSH REL*: See Appendix D OSHA PEL*: TWA 15 mg/m3 [*Note: REL and PEL also apply to other insoluble molybdenum compounds (as Mo).] IDLH 5000 mg/m3 (as Mo)
Poison_Class
-
Exposure effects
Anorexia and listlessness have been reported in animals.
   Ingestion
May cause anemia, leukopenia, and thrombocytopenia. May cause headache, fever, nausea, abdominal pain, muscle pain and bloody urine.
   Inhalation
Olfactory fatigue may occur. When inhaled as a dust or fume, may cause benign pneumoconiosis. Can produce delayed pulmonary edema.
   Skin
May cause skin irritation and possible burns.
   Eyes
May cause lacrimation (tearing), blurred vision, and photophobia. May cause chemical conjunctivitis and corneal damage.

First aid
 
   Ingestion
Never give anything by mouth to an unconscious person. Get medical aid immediately. Do NOT induce vomiting. If conscious and alert, rinse mouth and drink 2-4 cupfuls of milk or water.
   Inhalation
Get medical aid immediately. Remove from exposure to fresh air immediately. If breathing is difficult, give oxygen. Do not use mouth-to-mouth respiration if victim ingested or inhaled the substance; induce artificial respiration with the aid of a pocket mask equipped with a one-way valve or other proper respiratory medical device.
   Skin
Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse.
   Eyes
Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Transport.
UN number
3089
Response guide
Hazard class
4.1
Packing Group
II; III