N-Methyl-2-Pyrrolidone (NMP), with the CAS Number 872-50-4, is a reference substance for gas chromatography (GC). It falls under the category of Lactams and has a Molecular Weight of 99.13 g/mol. In the workplace, it requires specific precautions such as no smoking, no admittance for unauthorized persons, no eating and drinking, precept labels, use of safety goggles, and wearing safety gloves. The European Union has set binding occupational exposure limits, including an 8-hour limit value of 40 mg/m3 (10 ppm) and a short-term limit value of 80 mg/m3 (20 ppm). Skin exposure to NMP may contribute substantially to the total body burden.

• CAS Number: 872-50-4
• Molecular Formula: C5H9NO
• Molecular Weight: 99.13
• Exact Mass: 99.068413911
• Boiling Point: 396 °F at 760 mmHg (NTP, 1992)
• Melting Point: -9 °F (NTP, 1992)
• Vapour Density: 3.4 (NTP, 1992) - Heavier than air; will sink (Relative to Air)
• GHS Signal Word: Danger
• Hazard Statements:
• H315: Causes skin irritation [Warning Skin corrosion/irritation]
• H227: Combustible liquid [Warning Flammable liquids]