The substance identified as n-Heptane, with CAS Number 142-82-5, falls under the category of Reference Substances for Gas Chromatography (GC) within the broader classification of Reference Substances for HPLC/TLC/GC. It is a hydrocarbon, specifically an aliphatic, saturated one, with a Molecular Weight of 100.20 g/mol. In the workplace, it is essential to adhere to several safety measures, including the prohibition of open flames, no unauthorized personnel admission, caution against inflammable materials, use of safety goggles, and wearing safety gloves. The recommended indicative occupational exposure limit value for the European Union is 8 hours limit value: 2085 mg/m3 (500 ppm).

• CAS Number: 142-82-5
• Molecular Formula: C7H16
• Molecular Weight: 100.20
• Exact Mass: 100.125200510
• Boiling Point: 209.1 °F at 760 mmHg (USCG, 1999)
• Melting Point: -131 °F (USCG, 1999)
• Density: 3.45 (Air = 1)
• GHS Signal Word: Danger
• Hazard Statements:
• H225: Highly Flammable liquid and vapor [Danger Flammable liquids]