Span-80 is a yellow oily liquid, easily soluble in water, ethanol, methanol or ethyl acetate, and very slightly soluble in mineral oil. It is a w/o type emulsifier with strong emulsification, dispersing and lubricating effects. It can be mixed with various surfactants, especially Tween-60, and the compound use effect is better. HLB value is 4.7, melting point is 52-57℃.