Tween-81, Emulsifier T-81


Tween-81 is soluble in hard water, diluted acid/alkalis, and most organic solvents. Relative density: 1.00±0.05, HLB value is 10.0.

Tween-81, also known as polyoxyethylene (5) sorbitan monooleate, consists of sorbitol, ethylene oxide, and oleic acid. At room temperature, it is in the form of a pale-yellow orange oily liquid.

Molecular Formula:


Structure Formula:

tween-81 structure formula


Item Index
Appearance Amber oily liquid
Acid value 2mgKOH/g Max.
Saponification value 90-105mgKOH/g
Hydroxyl value 135-165mgKOH/g
Water 3.0% Max.


Tween-81 is used as an emulsifier, solubilizer, stabilizer, diffusant, lubricant, etc.

As O/W emulsifier and dispersant, Tween-81 often used in conjuction with the appropriate Crill. Good solubilizing properties, recommended in systems with unsaturated lipid components such as oleyl alcohol and vegetable triglycerides.

Packing and Storage:

In 200KGs iron drum/plastic drum.

Handle with care; Tween-81 is stored in a cool, dry, and draughty place. The shelf life is 2 years. Then, Tween-81 can still be used if qualified after re-check.


Emulsifier T-81, Polysprbate 81