Database/Emulsifying Surfactant/PEG-8 Distearate
Mostly natural · ISO 16128

Is PEG-8 Distearate natural?

Mostly. Stearic acid chains trace to oleochemical fat/oil feedstock; the PEG-8 backbone traces to petrochemical ethylene oxide.

INCI namePEG-8 Distearate
CAS9005-08-7
FunctionEmulsifying Surfactant
FeedstockMade by esterifying both ends of polyethylene glycol…

How we scored it

CosIng describes a PEG-8 (8 EO) diester; supplied formula/IUPAC (C19H40O4, glycol+heptadecanoic acid) mismatches and is ignored. PEG-8 backbone 370.4 Da (petrochemical) + 2 stearoyl 534.9 Da (natural) = 903.3 Da → 534.9/903.3 = 0.59.
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 both ends of polyethylene glycol (8 mol EO, from petrochemical ethylene oxide) with stearic acid, typically from vegetable or animal fat. No alternative bio-based PEG route is in significant commercial use.

In plain English

A wax-like emulsifier made by attaching two stearic acid (fatty acid) chains to a short polyethylene glycol (PEG) backbone. It helps blend oil and water in creams and lotions.

CosIng definition: Poly(oxy-1,2-ethanediyl), .alpha.-(1-oxooctadecyl)-.omega.-[(1-oxooctadecyl)oxy]- (8 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-8 DISTEARATE. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
  3. 3PEG-8 DISTEARATE. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=PEG-8%20DISTEARATE