The Tetrahydrofuran (C4H8O) solvent is categorized under ROTIDRY® plus - with molecular sieve. It belongs to the Oxygen heterocycles substance group and has a Molecular Weight of 72.11 g/mol. In the workplace, it is labeled 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, Wear safety gloves. The recommended indicative occupational exposure limit value for the European Union is an 8 hours limit value of 150 mg/m3 (50 ppm) and a Short term limit value of 300 mg/m3 (100 ppm), according to Directive 2000/39/EC. This compound is highly flammable and may cause skin irritation.

• 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]