Database/Emulsifying Surfactant/PEG-5 Lanolin
Mostly natural · ISO 16128

Is PEG-5 Lanolin natural?

Mostly. Lanolin is natural; the polyethylene glycol chain grafted onto it is petrochemical. The lanolin mass follows the site's other PEG-n Lanolin entries so the series reads consistently.

INCI namePEG-5 Lanolin
CAS61790-81-6
FunctionEmulsifying Surfactant
FeedstockWool-grease lanolin ethoxylated with about 5 mol of…

How we scored it

Lanolin taken as about 400 Da per ethoxylated site (the value used for PEG-75 and PEG-20/30/40 Lanolin; natural) + 5×EO 220.3 Da (petrochemical) = 620.3 Da → 0.64.
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

Wool-grease lanolin ethoxylated with about 5 mol of ethylene oxide.

In plain English

An emulsifier made from sheep's wool wax combined with a small amount of a petrochemical ingredient, used to blend water and oil in creams.

CosIng definition: Lanolin, ethoxylated (5 mol EO average molar ratio)

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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 LANOLIN. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
  3. 3PEG-5 LANOLIN. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=PEG-5%20LANOLIN