PEG …
Reviewed by Kate · Last updated 18 Aug 2026
Type of silicone that enhances formulary texture and spreadability | Creates a breathable barrier that prevents water loss (ideal for improving dehydrated skin)
Addresses
EWG Safety Score
PEG/PPG-18/18 Dimethicone products at Skintique
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What Is PEG …?
PEG/PPG-18/18 dimethicone is a type of silicone that plays a variety of roles in cosmetic products, including functioning as a texture enhancer and cleansing (emulsifying) agent. Of note, PEG/PPG-18/18 dimethicone is described as enhancing the spreadability of formulations. It is also known to create a breathable barrier that prevents water loss (helpful for dry/dehydrated) skin.
PEG/PPG-18/18 dimethicone can be found in a variety of beauty products including makeup, sunscreen, and hair care.
The 2015 Cosmetic Ingredient Review safety assessment of PEG/PPG-18/18 dimethicone concluded that this ingredient is safe in its reported cosmetic uses (out of 461 products studied 10% was the maximum concentration in use at the time).
In case you’re wondering, PEG stands for polyethylene glycol; PPG stands for polypropylene glycol.
Clinical Evidence & References
Published Research
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Toxicological Research, June 2015, pages 105–136 [https://doi.org/10.5487/TR.2015.31.2.105]
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Cosmetic Ingredient Review, January 2015, pages 1-46 [https://www.cir-safety.org/sites/default/files/ROPSIL_122014%20_FAR.pdf]
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https://online.personalcarecouncil.org/ctfa-static/online/lists/cir-pdfs/FR664.pdf [https://online.personalcarecouncil.org/ctfa-static/online/lists/cir-pdfs/FR664.pdf]
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International Journal of Pharmaceutics, July 2005, pages 367–371 [https://www.sciencedirect.com/science/article/abs/pii/S0378517305002346]
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Journal of Colloid and Interface Science, March 2008, pages 316–321 [https://www.sciencedirect.com/journal/journal-of-colloid-and-interface-science/vol/319/issue/1]
Frequently Asked Questions
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A fatty acid that cleanses and conditions skin whilst helping formulations remain stable
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A synthetic emulsifier that helps bind water and oil in skincare formulations
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Functions as a thickener, moisturising ingredient, and binding agent | Derived from the fatty acid isostearic acid
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