TWEEN® 20 (Polysorbate)


TWEEN® 20, Polyethylene glycol sorbitan monolaurate, Polyoxyethylenesorbitan monolaurate
CAS Number:
MDL number:
EC Index Number:

storage conditions

Store at +15°C to +25°C.


Ph. Eur.

Quality Level

vapor pressure

<1.4 hPa ( 20 °C)

product line

EMPROVE® Essential


38900 mg/kg LD50, oral (Rat)

mol wt


refractive index

n20/D 1.468 (lit.)


6-8 (20 °C, 50 g/L in H2O)

transition temp

flash point 275 °C


1.095 g/mL at 25 °C (lit.)

storage temp.




InChI key


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General description

Finding the right excipient that matches your needs as well as regulatory demands can be a complicated challenge in formulation. With our application know-how and regulatory expertise, we support you in every step of development, scale-up, and production.
As part of our Emprove® Program, our raw materials are offered with extensive documentation facilitating compliance of your pharma and biopharma product, full supply chain transparency and risk mitigation. Our SAFC® portfolio of high-quality products for biopharmaceutical and pharmaceutical formulation and production withstands strict quality control procedures and is produced according to applicable cGMP guidelines.


Polysorbate 20 is used as surfactant in a variety of liquid formulations and acts e.g. as emulsifying, solubilizing and wetting agent.
Non-ionic detergent

Legal Information

Emprove is a registered trademark of Merck KGaA, Darmstadt, Germany
SAFC is a registered trademark of Merck KGaA, Darmstadt, Germany
TWEEN is a registered trademark of Croda International PLC

Certificate of Analysis

Certificate of Origin

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