Diethylene glycol is a colorless, odorless, transparent, hygroscopic viscous liquid, with spicy sweet, non-corrosive, low toxicity. Boiling point 245 °C, melting point of -6.5 °C, freezing point of -10.45 °C, flash point 123.9, refractive index 1.4472, the relative density of 1.1184, viscosity 0.30 parking, can be used for solvent, textile auxiliaries, rubber and resin in the plasticizer.