Database/Emulsifying Surfactant/PEG-6 Isostearate
Mostly petroleum · ISO 16128

Is PEG-6 Isostearate natural?

Mostly not. Isostearic acid traces to oleochemical fatty-acid feedstock; the PEG-6 backbone traces to petrochemical ethylene oxide.

INCI namePEG-6 Isostearate
CAS56002-14-3
FunctionEmulsifying Surfactant
FeedstockMade by esterifying polyethylene glycol (6 mol EO,…

How we scored it

CosIng describes a PEG-6 (6 EO) monoester; supplied formula/IUPAC matches triethylene glycol (3 EO) and is ignored. PEG-6 backbone 281.3 Da (petrochemical) + isostearoyl 267.5 Da (natural) = 548.8 Da → 267.5/548.8 = 0.49.
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 esterifying polyethylene glycol (6 mol EO, from petrochemical ethylene oxide) with isostearic acid, typically derived from oleic acid isomerisation/dimerisation. No alternative bio-based PEG route is in significant commercial use.

In plain English

An emulsifier made by attaching a branched fatty (isostearic) acid chain to a short polyethylene glycol (PEG) backbone, helping blend oil and water in formulas.

CosIng definition: Poly(oxy-1,2-ethanediyl), .alpha.-(1-oxoisooctadecyl)-.omega.-hydroxy- (6 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-6 ISOSTEARATE. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
  3. 3PEG-6 ISOSTEARATE. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=PEG-6%20ISOSTEARATE