Database/Emollient/Stearoxytrimethylsilane
100% petroleum · ISO 16128

Is Stearoxytrimethylsilane natural?

No. Contains a trimethylsilyl group, classing it with silicones, which are 0.0 by this site's convention despite the majority-natural stearyl chain.

INCI nameStearoxytrimethylsilane
CAS18748-98-6
FormulaC21H46OSi · 342.7 Da
FunctionEmollient · Skin Conditioning
FeedstockMade by reacting stearyl alcohol (a natural fatty…

How we scored it

Organosilicon compound, Si(CH3)3-O-stearyl; scored 0.0 under this site's convention that all silicones/organosilicons are 0 regardless of the majority-natural stearyl chain mass.
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 reacting stearyl alcohol (a natural fatty alcohol) with a chlorosilane to install the trimethylsilyl group. This site's silicone convention overrides the natural fatty-chain mass.

In plain English

A silicone-type emollient that gives skin and hair a smooth, silky feel. It is made by attaching a silicone group to stearyl alcohol, a fatty alcohol.

CosIng definition: Trimethyl(octadecyloxy)silane

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Structure

2D structure of Stearoxytrimethylsilane

trimethyl(octadecoxy)silane

PubChem CID 87778 ↗

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. 2Stearoxytrimethylsilane. PubChem CID 87778. National Center for Biotechnology Information. pubchem.ncbi.nlm.nih.gov ↗
  3. 3STEAROXYTRIMETHYLSILANE. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
  4. 4STEAROXYTRIMETHYLSILANE. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=STEAROXYTRIMETHYLSILANE