Database/Emollient/Trimethyl Pentaphenyl Trisiloxane
100% petroleum · ISO 16128

Is Trimethyl Pentaphenyl Trisiloxane natural?

No. Silicone whose Si-O backbone is 0.0 by this site's convention; the five phenyl groups come from petrochemical benzene and the methyl groups from methanol-derived methyl chloride.

INCI nameTrimethyl Pentaphenyl Trisiloxane
CAS3390-61-2
FormulaC33H34O2Si3 · 546.9 Da
FunctionEmollient · Skin Conditioning
FeedstockDominant route: silicon metal converted to methyl- and…

How we scored it

C33H34O2Si3, 546.9 Da: a phenyl-methyl siloxane. Silicones are 0.0 by this site's convention and the five phenyl rings are benzene-derived. 0 / 546.9 = 0.00.
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

Dominant route: silicon metal converted to methyl- and phenyl-chlorosilanes, which are hydrolysed and condensed. No natural-origin route is known.

In plain English

A phenyl silicone fluid that spreads smoothly, adds gloss and slip and has a high refractive index, used as an emollient in skin and hair products. It is made synthetically from silicon, methyl chloride and benzene derivatives.

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Structure

2D structure of Trimethyl Pentaphenyl Trisiloxane

methyl-bis[[methyl(diphenyl)silyl]oxy]-phenylsilane

PubChem CID 76925 ↗

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. 2Trimethyl Pentaphenyl Trisiloxane. PubChem CID 76925. National Center for Biotechnology Information. pubchem.ncbi.nlm.nih.gov ↗
  3. 3TRIMETHYL PENTAPHENYL TRISILOXANE. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
  4. 4TRIMETHYL PENTAPHENYL TRISILOXANE. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=TRIMETHYL%20PENTAPHENYL%20TRISILOXANE