Database/Hair Conditioning/Hydrolyzed Silk PG-Propyl Methylsilanediol
Mostly natural · ISO 16128

Is Hydrolyzed Silk PG-Propyl Methylsilanediol natural?

Mostly. Natural silk-protein hydrolysate backbone dominates mass; the propanediol/silane end-group is petrochemical and silicone by this site's convention.

INCI nameHydrolyzed Silk PG-Propyl Methylsilanediol
FunctionHair Conditioning · Skin Conditioning
FeedstockMade by reacting hydrolysed silk protein with 1,2-propanediol…

How we scored it

Hydrolysed silk peptide (natural, ~1.0) reacted with 1,2-propanediol and a propyl methylsilanediol silane cap (petrochemical/silicone, 0.0). Modifier estimated as a minor mass fraction, ~80% natural overall.
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 hydrolysed silk protein with 1,2-propanediol and a silane coupling agent to improve deposition on hair and skin, per the CosIng description. Exact substitution level isn't disclosed, so the natural fraction is estimated.

In plain English

A hair- and skin-conditioning ingredient combining hydrolysed silk protein with a silicone-like modifier for better adhesion. The protein comes from silk cocoons; the modifier is synthetic.

CosIng definition: Protein hydrolyzates, silk, reaction product with 1,2-propanediol, dihydroxymethylpropylsilyl ether

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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. 2HYDROLYZED SILK PG-PROPYL METHYLSILANEDIOL. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
  3. 3HYDROLYZED SILK PG-PROPYL METHYLSILANEDIOL. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=HYDROLYZED%20SILK%20PG-PROPYL%20METHYLSILANEDIOL