Colorless to pale yellow viscous liquid. Non-volatile. No corrosive. Molecular weight of 400 ~ 2050 of the general goods. Low molecular weight polymer is soluble in water. High molecular weight polymer is only slightly soluble in water, soluble in many hydrocarbon oils, and fatty alcohol, ketone, ester, etc. At the ends of the molecule hydroxy esterification can generate single ester or double ester. The monoester is ionic surfactant, and alcohol can also generate ether. Is vegetable oil, resin and paraffin solvents, also used for the preparation of alkyd resin, emulsifying agent, demulsifier, lubricating oil and plasticizer, etc. By epoxy propane and propylene glycol in high pressure or condensation in the presence of acid catalyst.