The chemical substance known as Tetrahydrofuran is classified under Reference Substances for Gas Chromatography (GC), within the broader category of Natural & Reference Materials, Phytochemicals, and Reference substances HPLC/TLC/GC. It has a Molecular Weight of 72.11 g/mol and belongs to the Oxygen heterocycles substance group. In the workplace, it is labeled with several warnings such as "Prohibition label," "No open flame; fire, open ignition sources and smoking prohibited," "No admittance for unauthorized persons," "Warning label," "Caution - inflammable material," "Precept label," "Use safety goggles," and "Wear safety gloves." The European Union has recommended an occupational exposure limit value of 150 mg/m3 (50 ppm) for an 8-hour workday and 300 mg/m3 (100 ppm) for short-term exposures

• CAS Number: 109-99-9
• Molecular Formula: C4H8O
• Molecular Weight: 72.11
• Exact Mass: 72.057514874
• Boiling Point: 151 °F at 760 mmHg (NTP, 1992)
• Melting Point: -163.3 °F (NTP, 1992)
• Vapour Density: 2.5 (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]
• H315: Causes skin irritation [Warning Skin corrosion/irritation]