Polysorbate 65,also known as polyoxyethylene(20)sorbitan tristearate and tween 65,consists of sorbitol,ethylene oxide and stearic acid.It has a molecular formula of C100H194O28.At roon temperature,it is in the form of yellow viscous liquid or paste.It is an O/W emulsifier with an HLB value of 10.5.Polyoxyethylene sorbitan tristearate is soluble in ethanol,ethy acetate,acetone and can be dispersed in water.