Tetrahydrofuran (THF) CAS Number 109-99-9 Formula C4H8O or (CH2)3CH2O Tetrahydrofuran (THF) is a clear, colourless, volatile, and water-miscible liquid. It has low viscosity at standard temperature and has the formula C4H8O. It has smell similar to diethyl ether and is one of the most polar ethers. SPECIFICATION Appearance Clear Liquid Purity 99.993 wt % Color < 5 APHA Moisture 52 ppm Peroxides 8 ppm Specific Gravity (20/4�°C) 0.88746 Refractive Index 1.4071 MAJOR USE: As a solvent for special resins such as photosensitive resins, because even at room temperature it can dissolve various resins, and it is miscible with water and most organic solvents. In, addition, it is used as a solvent for Grignard and Wittig reactions. These products are available in bulk, drums & bags delivered from Kandla, Mundra, Hazira, Mumbai and Vizag ports & Bhiwandi and Ahmedabad stock points.