Database/Emulsifying Surfactant/PEG-5 Hydrogenated Castor Oil
Mostly natural · ISO 16128

Is PEG-5 Hydrogenated Castor Oil natural?

Mostly. Hydrogenated castor oil triglyceride is fully natural; the 5 ethylene-oxide units added to make it water-dispersible are petrochemical.

INCI namePEG-5 Hydrogenated Castor Oil
CAS61788-85-0
FunctionEmulsifying Surfactant · Cleansing Surfactant
FeedstockMade by hydrogenating castor oil (Ricinus communis seed…

How we scored it

Hydrogenated castor oil ~940 Da (natural triglyceride) + 5 EO x44 Da (petrochemical) = 1160 Da total; 940/1160=0.81.
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

Made by hydrogenating castor oil (Ricinus communis seed oil) then reacting it with about 5 moles of petrochemical ethylene oxide. Castor oil is essentially the sole commercial feedstock.

In plain English

A mild emulsifier made from hardened castor bean oil treated with a small amount of a synthetic thickening agent, helping blend oil and water in products.

CosIng definition: Castor oil (Ricinus communis), hydrogenated, ethoxylated (5 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-5 HYDROGENATED CASTOR OIL. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
  3. 3PEG-5 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-5%20HYDROGENATED%20CASTOR%20OIL