Database/Emulsifying Surfactant/PEG-20 Hydrogenated Castor Oil
Mostly natural · ISO 16128

Is PEG-20 Hydrogenated Castor Oil natural?

Mostly. Natural hydrogenated castor oil ethoxylated with 20 mol petrochemical ethylene oxide.

INCI namePEG-20 Hydrogenated Castor Oil
CAS61788-85-0
FunctionEmulsifying Surfactant · Cleansing Surfactant
FeedstockHydrogenated natural castor oil is reacted with 20…

How we scored it

Hydrogenated castor oil 939.5 Da (natural) + 20x EO 44.05 Da = 881.1 Da (petrochemical) -> 939.5/1820.6=0.52.
What counts. ISO 16128-2 scores the atoms that remain in the final ingredient. Reagents, solvents, catalysts and protecting groups used during manufacture leave no mass behind and are not counted.

Where it comes from

Hydrogenated natural castor oil is reacted with 20 moles of petrochemical ethylene oxide to form a shorter PEG chain than the higher-EO grades. No bio-based ethoxylation alternative is used commercially.

In plain English

An emulsifier made from hydrogenated castor oil combined with a petroleum-derived chemical, used to blend oil and water together in creams and washes.

CosIng definition: Castor oil (Ricinus communis), hydrogenated, ethoxylated (20 mol EO average molar ratio)

Natural alternatives with the same function

References

  1. 1ISO 16128-1:2016 and ISO 16128-2:2017 — Guidelines on technical definitions and criteria for natural and organic cosmetic ingredients and products. ISO, Geneva.
  2. 2PEG-20 HYDROGENATED CASTOR OIL. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
  3. 3PEG-20 HYDROGENATED CASTOR OIL. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=PEG-20%20HYDROGENATED%20CASTOR%20OIL