PEG/PPG-18/18 Dimethicone


Cleansing Agent

No known benefits

PEG/PPG-18/18 Dimethicone at a glance

  • Type of silicone that enhances formulary texture and spreadability
  • Creates a breathable barrier that prevents water loss (ideal for improving dehydrated skin)
  • Found in a variety of beauty products including makeup, sunscreen, and hair care
  • Deemed safe by the Cosmetic Ingredient Review Expert Panel

PEG/PPG-18/18 Dimethicone description

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.

PEG/PPG-18/18 Dimethicone references

  • Toxicological Research, June 2015, pages 105–136
  • Cosmetic Ingredient Review, January 2015, pages 1-46
  • International Journal of Pharmaceutics, July 2005, pages 367–371
  • Journal of Colloid and Interface Science, March 2008, pages 316–321

Peer-reviewed, substantiated scientific research is used to assess ingredients in this dictionary. Regulations regarding constraints, permitted concentration levels and availability vary by country and region.

Ingredient ratings


Proven and supported by independent studies. Outstanding active ingredient for most skin types or concerns.


Necessary to improve a formula's texture, stability, or penetration.


Generally non-irritating but may have aesthetic, stability, or other issues that limit its usefulness.


There is a likelihood of irritation. Risk increases when combined with other problematic ingredients.


May cause irritation, inflammation, dryness, etc. May offer benefit in some capability but overall, proven to do more harm than good.


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Not rated

We have not yet rated this ingredient because we have not had a chance to review the research on it.