High Thermal Stability – Exhibits excellent heat resistance with a very high melting/freezing point of 795°C, making it suitable for high-temperature applications.
Low Flammability Risk – Rated 0 for flammability under the NFPA-704 system, indicating non-flammable properties and safer handling.
Stable Chemical Properties – With low reactivity (NFPA rating 0), it remains stable under normal conditions.
Distinct Physical Characteristics – Appears as an odorless white crystalline powder that turns yellow when heated, enabling easy identification during processing.
Molybdenum Trioxide CAS#1313-27-5 Molybdenum trioxide is an odorless white crystalline powder that turns yellow upon heating. It has a melting/freezing point of 795°C. According to the NFPA-704 hazard rating system, it is classified as Health 2, Flammability 0, and Reactivity 0. The compound is slightly soluble in water.
Molybdenum trioxide Chemical Properties
| Melting point | 795 °C(lit.) |
| Boiling point | 1155 °C |
| Bulk density | 1200kg/m3 |
| Density | 4.692 |
| Vapor pressure | 0Pa at 20℃ |
| Refractive index | 2.5166 |
| Fp | 1155°C subl. |
| Storage temp | Store at +5°C to +30°C. |
| Solubility | 0.49g/l |
| Form | Sublimed Powder |
| Color | White to gray |
| Specific Gravity | 4.69 |
| Odor | Odorless |
| Water Solubility | 0.5 g/L (20 ºC) |
| Merck | 146239 |
| Crystal system | Nogata |
| Space group | Pnma |
| Lattice constant | a/nmb/nmc/nmα/oβ/oγ/oV/nm31.3850.36960.39669090900.203 |
| Exposure limits | ACGIH: TWA 10 mg/m3; TWA 3 mg/m3 |
| NIOSH: IDLH 5000 mg/m3 | |
| InChI | 1S/Mo.3O |
| InChIKey | JKQOBWVOAYFWKG-UHFFFAOYSA-N |
| SMILES | O=[Mo](=O)=O |
| CAS DataBase Reference | 1313-27-5(CAS DataBase Reference) |
| IARC | 2B (Vol. 118) 2018 |
| NIST Chemistry Reference | Molybdenum(vi) oxide(1313-27-5) |
| EPA Substance Registry System | Molybdenum trioxide (1313-27-5) |
Safety Information
| Hazard Codes | Xn,Xi |
| Risk Statements | 36/37-48/20/22-40 |
| Safety Statements | 22-23-25-36/37 |
| WGK Germany | 1 |
| RTECS | QA4725000 |
| TSCA | TSCA listed |
| HazardClass | 6.1 |
| HS Code | 28257000 |
| Storage Class | 11 - Combustible Solids |
| Hazard Classifications | Carc. 2 |
| Eye Irrit. 2 | |
| STOT SE 3 | |
| Hazardous Substances Data | 1313-27-5(Hazardous Substances Data) |
| Toxicity | LD50 orally in Rabbit: 2689 mg/kg LD50 dermal Rat > 2000 mg/kg |
Product Application of Molybdenum Trioxide CAS#1313-27-5
Molybdenum(VI) oxide is used in catalyst formulations for the desulfurization of petroleum feedstocks and for the removal of nitrogen-containing compounds from petroleum fractions. It is also utilized in the production of various molybdate salts and serves as a reagent in chemical analysis.
