Acetonitrile, a nitrile solvent with the molecular formula C2H3N and a Molecular Weight of 41.05 g/mol, is classified under the category of Solvents for HPLC. It falls under the substance group of Nitriles. In the workplace, it is labeled with several precautions such as "No open flame; fire, open ignition sources and smoking prohibited," "No admittance for unauthorized persons," "Caution - inflammable material," "Use safety goggles," and "Wear safety gloves." The recommended indicative occupational exposure limit value for the European Union is an 8-hour limit value of 70 mg/m3 (40 ppm), as per Directive 2006/15/EC. Acetonitrile is highly flammable, as indicated by the GHS signal word "Danger.

• CAS Number: 75-05-8
• Molecular Formula: C2H3N
• Molecular Weight: 41.05
• Exact Mass: 41.026549100
• Boiling Point: 178.9 °F at 760 mmHg (NTP, 1992)
• Melting Point: -49 °F (NTP, 1992)
• Vapour Density: 1.42 (NTP, 1992) - Heavier than air; will sink (Relative to Air)
• GHS Signal Word: Danger
• Hazard Statements:
• H225: Highly Flammable liquid and vapor [Danger Flammable liquids]