Salts & Minerals
REACH
Molybdenum
CAS Number
7439-98-7
EC Number
231-107-2
Abbreviation
Mo
What is Molybdenum?
Molybdenum (CAS 7439-98-7), symbol Mo, is a refractory transition metal traded as a primary alloying and catalytic material.
Where is Molybdenum used?
- Metallurgy and chemical processing: high-performance strengthener in steel alloys and catalytically active component in refining and synthesis
- Petroleum refining: Mo-based catalysts in hydrodesulfurization units remove sulfur from crude fractions
- Steel and superalloy manufacturing: improves high-temperature strength and corrosion resistance in structural components, tooling and aerospace parts
- Chemical industry: molybdenum compounds serve as precursors for oxidation and ammoxidation catalysts in acrylonitrile and formaldehyde production
- Pigment production: precursor for molybdate-based colorants in coatings and plastics
- Powder is the most common traded form for chemical and metallurgical processing.
Commercial specifications
- Purity levels typically 99.9% to 99.99%
- Standard grades: technical-grade and high-purity specifications
Other Names (Synonyms)
metallic molybdenum|elemental molybdenum|element 42|42Mo|molybdenum atom|Molybdenum, metallic|MChVL|Molybdenum metallicum|Mo
What are the physical properties of Molybdenum?
Melting Point 2622 °C
Boiling Point ~4825 °C (approx)
Density 10.28 g/cm³
Flash Point -23 °C
Appearance Molybdenum is a silvery-white metal or dark gray or black powder with a metallic luster.
Color Gray
Form wire
Water Solubility Insoluble inwater. Soluble innitric acid andsulfuric acid. Slightly soluble inhydrochloric acid.
Refractive Index 2.81 (740 nm)
pH 9.2 (20°C in H2O)
How is Molybdenum classified and handled safely? Learn More
Danger
GHS02· Flammable GHS08· Health Hazard GHS07· Irritant
Hazard Statements
H225 Highly Flammable liquid and vapor
H228 Flammable solid
H315 Causes skin irritation
H319 Causes serious eye irritation
H335 May cause respiratory irritation
H361 Suspected of damaging fertility or the unborn child
Precautionary Statements
P203 Obtain, consult and follow expert instructions for use.
P210 Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
P233 Keep container tightly closed.
P240 Ground and bond container and receiving equipment.
Which trade and regulatory codes apply to Molybdenum?
HS Code 81029600
UN Number 3264
ADR Class 8
Packing Group III
WGK (Germany) 3