This Osmium Tetraoxide, with a Molecular Weight of 254.2 g/mol, is used primarily for fixation in electron microscopy within the life science field, specifically histology and microscopy. It belongs to the categories of Osmium compounds and Metal oxides. Due to its hazardous nature, it requires specific precautions such as wearing safety goggles, safety gloves, and prohibiting smoking, eating, and drinking near it. The substance has a Boiling Point of 266°F and a Melting Point of 105°F. Handling this chemical should be done with extreme caution, as it is fatal if swallowed.

• CAS Number: 20816-12-0
• Molecular Formula: O4Os
• Molecular Weight: 254.2
• Exact Mass: 255.94114
• Boiling Point: 266 °F at 760 mmHg (NIOSH, 2024)
• Melting Point: 105 °F (NIOSH, 2024)
• Density: Relative Vapour Density (air = 1): 8.8
• GHS Signal Word: Danger
• Hazard Statements:
• H300: Fatal if swallowed [Danger Acute toxicity, oral]
• H301: Toxic if swallowed [Danger Acute toxicity, oral]