Overview
Molybdenum (CAS 7439-98-7 ), commonly referenced by its symbol Mo, is a refractory transition metal sourced and traded as a primary alloying and catalytic material across industrial supply chains.
In metallurgy and chemical processing, it functions as a high-performance strengthener in steel alloys and as a catalytically active component in refining and synthesis operations.
In petroleum refining, Mo-based catalysts are used in hydrodesulfurization units to remove sulfur from crude fractions, meeting fuel quality specifications for global distribution.
Steel and superalloy manufacturers incorporate molybdenum to improve high-temperature strength and corrosion resistance in structural components, tooling, and aerospace parts for extreme environments.
In the chemical industry, molybdenum compounds derived from elemental Mo serve as precursors for oxidation and ammoxidation catalysts used in producing acrylonitrile and formaldehyde.
Pigment producers also use molybdenum as a precursor for molybdate-based colorants applied in coatings and plastics, ensuring high durability and color stability in industrial applications.
Molybdenum is commercially available as powder, rod, sheet, wire, and sintered parts, with powder being the most common traded form for chemical and metallurgical processing.
Standard grades include technical-grade and high-purity specifications, with purity levels typically ranging from 99.9% to 99.99% depending on specific end-use requirements.
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Physical Properties
| 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) |
Safety & Handling
Danger GHS02 GHS08 GHS07 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. P241 Use explosion-proof [electrical/ventilating/lighting/…] equipment. P242 Use non-sparking tools. P243 Take action to prevent static discharges. P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P264 Wash … thoroughly after handling. P271 Use only outdoors or in a well-ventilated area. P280 Wear protective gloves/protective clothing/eye protection/face protection. P318 IF exposed or concerned, get medical advice. P319 Get medical advice/attention if you feel unwell. P321 Specific treatment (see … on this label). P405 Store locked up. P501 Dispose of contents/container in accordance with local regulations. P264+P265 Wash … thoroughly after handling. P302+P352 IF ON SKIN: Wash with plenty of water. P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing. P332+P317 Get emergency medical help. P337+P317 If eye irritation persists: Get medical advice/attention. Get emergency medical help. P362+P364 Take off contaminated clothing and wash it before reuse. P370+P378 Use … for extinction. P403+P233 Store in a well-ventilated place. Keep container tightly closed. P403+P235 Store in a well-ventilated place. Keep cool. P303+P361+P353 IF ON SKIN (or hair): Take off immediately all contaminated clothing. Rinse skin with water/shower. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
Trade & Regulatory
| HS Code | 81029600 |
| UN Number | 3264 |
| ADR Class | 8 |
| Packing Group | III |
| WGK (Germany) | 3 |
Other Names
Related Products
Chemical Properties
- CAS Number
- 7439-98-7
- EC Number
- 231-107-2
- Mol. Weight
- 95.95
- HS Code
- 81029600
- Category
- Pigments & Colorants