Appearance( 25 ) : Colorless viscous liquid or Translucent soft waxy material  Clarity and color of solution: Non-concentraded, not deeper than 2 # standard solution:  Average molecular weight: 560-640 Viscosity: m¡ / s : 56-62 PH value: 5-7 Ignition Residue: d0.2  Storage: This product is non-toxic and flame retardant. Regarded as a general shipments of chemicals, it should be sealed and stored in dry place.  Function: molecular weight of PEG600 larger than PEG400, while water solubility of PEG400 is larger than that of PEG600. As the PEG600 is liquid, it has a broad compatibility with various solvents, and is Good solvent and solubilizer. It has been widely used in liquid preparations, such as the oral solution, eye drops etc.