Ingredient review
PEG/PPG-17/18 Dimethicone
INCI: PEG/PPG-17/18 Dimethicone
A gentle silicone emulsifier that helps blend water and oil ingredients while leaving a smooth, non-sticky feel on skin.
In plain English
This is a type of silicone that helps mix water and oil in a product so it stays blended and feels silky on your skin. It's often used in creams and sunscreens to make them spread easily and not feel greasy. Think of it as a helper ingredient that improves texture and stability without clogging pores or causing irritation for most people.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
The evidence base is useful, but some claims depend heavily on the formula.
Risk flags are low for most users, though the finished product can still irritate.
- Source
- synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
PEG/PPG-17/18 Dimethicone is generally a lower-concern ingredient when the full formula suits your skin.
Plain-English read
Treat this as a practical screening step before you compare products that contain this ingredient.
- Step 1Start with the score, then check the irritation and clogging risk before judging PEG/PPG-17/18 Dimethicone.
- Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
- Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.
Score terms in plain English
Irritation risk
lowLess likely to sting, burn, or bother most users, though sensitive skin can still react.
Clogging risk
lowLess likely to feel heavy or contribute to clogged pores for most skin types.
Evidence level
moderateThere is useful support, but formula details and claim strength still matter.
What it is
A synthetic silicone polymer modified with polyethylene glycol (PEG) and polypropylene glycol (PPG) chains, making it water-compatible while retaining silicone's smooth feel.
How it works
It acts as an emulsifier, reducing surface tension between water and oil phases so they mix into a stable cream or lotion. It also forms a thin, breathable film on skin that feels silky and helps other ingredients spread evenly.
Pros
Silky feel without grease
Creates a smooth, velvety finish on skin that doesn't feel heavy or oily, making it ideal for daytime moisturizers and primers.
Gentle for most skin types
Has a very low irritation and comedogenic rating, so it's unlikely to cause breakouts or stinging even for sensitive skin.
Cons and cautions
Synthetic and not biodegradable
As a silicone derivative, it is not naturally derived and may raise environmental concerns for eco-conscious users.
Can feel too slippery for some
The silky film may feel slippery or 'silicone-heavy' on skin, which some people dislike, especially if they prefer water-based textures.
Best for
- People who want a smooth, non-sticky moisturizer or primer
- Those with normal to combination skin looking for a lightweight feel
Use caution if
- Those strictly avoiding all silicones or synthetic ingredients
- Individuals with known sensitivity to PEG compounds (rare)
Usage tips
Safety summary
Generally recognized as safe for topical use in cosmetics. Low irritation and comedogenic risk. As with all PEG compounds, quality manufacturing is important to avoid impurities.
Research notes
Safety assessments by the Cosmetic Ingredient Review (CIR) panel have concluded that PEG/PPG dimethicones are safe for use in cosmetics when formulated appropriately. Limited peer-reviewed studies specific to this exact variant, but broader silicone safety data supports its low-risk profile.
Common label clues
- Typical concentration
- 1% to 5%
- Regulatory status
- Approved for use in cosmetics in the US, EU, and many other regions; subject to purity standards for PEG compounds.
- Common uses
- Moisturizers, Sunscreens, Serums, Makeup primers
- Environmental note
- Silicone derivatives can persist in the environment; however, this ingredient is used in low concentrations and is not classified as bioaccumulative.
Good to know
- PEG/PPG-17/18 Dimethicone is considered safe by cosmetic safety panels at typical use levels
- It is not the same as dimethicone—it has added water-friendly chains
Common questions
What is PEG/PPG-17/18 Dimethicone in beauty products?
This is a type of silicone that helps mix water and oil in a product so it stays blended and feels silky on your skin. It's often used in creams and sunscreens to make them spread easily and not feel greasy. Think of it as a helper ingredient that improves texture and stability without clogging pores or causing irritation for most people.
What does PEG/PPG-17/18 Dimethicone do in a beauty product?
It acts as an emulsifier, reducing surface tension between water and oil phases so they mix into a stable cream or lotion. It also forms a thin, breathable film on skin that feels silky and helps other ingredients spread evenly.
Is PEG/PPG-17/18 Dimethicone safe for most people?
Generally recognized as safe for topical use in cosmetics. Low irritation and comedogenic risk. As with all PEG compounds, quality manufacturing is important to avoid impurities.
Who should be careful with PEG/PPG-17/18 Dimethicone?
Those strictly avoiding all silicones or synthetic ingredients Individuals with known sensitivity to PEG compounds (rare)
Research sources
Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.