Tween-40, Emulsifier T-40, Polyoxyethylene Sorbitan Monopalmitate


Tween-40 is an amber oily liquid. Relative density: 1.05-1.10. HLB value is 15.6. Tween 40 is soluble in water, diluted acid, diluted alkalis, and most organic solvents, insoluble in vegetable oil. It is also called Polysorbate-40.

The Wikipedia said, Polysorbates are a class of emulsifiers used in some pharmaceuticals and food preparation. They are often used in cosmetics to solubilize essential oils into water-based products. Polysorbates are oily liquids derived from ethoxylated sorbitan (a derivative of sorbitol) esterified with fatty acids.

The number following the ‘polyoxyethylene’ part means the different -R group in the structure fomula. Other polysorbate emulsifiers also have Polysorbate-60, Polysorbate-80. Polysorbate-81 and Polysorbate-85.

CAS No.:


Molecular Formula:


Structure Formula:

tween-40 structure formula


AppearanceAmber oily liquid
Acid value2mgKOH/g Max.
Saponification value40-55mgKOH/g
Hydroxyl value85-100mgKOH/g
Water3.0% Max.


Tween-40 is used as an emulsifier, solubilizer, stabilizer, diffusant, fiber lubricant, etc.

Packing and Storage:

In 200kg iron drum/plastic drum. Handle with care. Tween-40 should be stored in a cool, dry, and draughty place. Shelf life is two years. Then, Tween-40 can still be used if qualified after re-check.

metal drum 200l plastic drum


Emulsifier T-40, Polyoxyethylene sorbitan monopalmitate, Polysorbate-40.


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