Ingredient review
PEG/PPG-18/6 Dimethicone
INCI: PEG/PPG-18/6 Dimethicone
A gentle silicone emulsifier that improves product texture and spreadability without clogging pores.
In plain English
PEG/PPG-18/6 Dimethicone is a type of silicone that helps mix oil and water in skincare products. It makes creams feel smooth and silky, spreads easily on skin, and leaves a soft, non-greasy finish. It is considered very gentle and unlikely to cause breakouts or 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-18/6 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-18/6 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 to make it water-compatible. It acts as a surfactant and emulsifier, allowing oil and water ingredients to blend into a stable, uniform product.
How it works
It reduces surface tension between oil and water droplets, creating a stable emulsion. Once applied, it forms a thin, breathable film on the skin that helps other ingredients spread evenly and provides a smooth, silky feel without heavy residue.
Pros
Excellent texture enhancer
Gives creams and lotions a silky, smooth feel that glides on easily and absorbs quickly without greasiness.
Very low irritation risk
Rated as low-irritation and low-comedogenic, making it suitable for sensitive and acne-prone skin types.
Cons and cautions
Synthetic origin
As a man-made silicone, it may not be preferred by those seeking natural or organic skincare formulations.
Potential processing impurities
PEG compounds can contain trace ethylene oxide or 1,4-dioxane if not properly purified, though reputable manufacturers ensure safety.
Best for
- People who want a silky, lightweight moisturizer
- Those with normal to oily skin looking for non-comedogenic products
Use caution if
- Individuals strictly avoiding all silicones or synthetic ingredients
Usage tips
Safety summary
PEG/PPG-18/6 Dimethicone is considered safe for use in cosmetics at typical concentrations. It has low irritation and comedogenic potential. As with all PEG compounds, quality control is important to avoid impurities.
Research notes
Safety assessments by the Cosmetic Ingredient Review (CIR) panel have concluded that PEG/PPG dimethicone copolymers are safe when formulated to be non-irritating. Studies show low skin penetration and minimal toxicity.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics globally, including by the FDA (USA) and EU CosIng database, with no concentration restrictions.
- Common uses
- Moisturizers, Serums, Sunscreens, Foundations, Hair conditioners
- Environmental note
- Silicones can persist in the environment; however, PEG/PPG-modified silicones may degrade more readily than unmodified silicones.
Good to know
- PEG/PPG-18/6 Dimethicone is often used in 'silky' or 'velvet' texture products.
- It is considered biodegradable in some conditions but not all.
Common questions
What is PEG/PPG-18/6 Dimethicone in beauty products?
PEG/PPG-18/6 Dimethicone is a type of silicone that helps mix oil and water in skincare products. It makes creams feel smooth and silky, spreads easily on skin, and leaves a soft, non-greasy finish. It is considered very gentle and unlikely to cause breakouts or irritation for most people.
What does PEG/PPG-18/6 Dimethicone do in a beauty product?
It reduces surface tension between oil and water droplets, creating a stable emulsion. Once applied, it forms a thin, breathable film on the skin that helps other ingredients spread evenly and provides a smooth, silky feel without heavy residue.
Is PEG/PPG-18/6 Dimethicone safe for most people?
PEG/PPG-18/6 Dimethicone is considered safe for use in cosmetics at typical concentrations. It has low irritation and comedogenic potential. As with all PEG compounds, quality control is important to avoid impurities.
Who should be careful with PEG/PPG-18/6 Dimethicone?
Individuals strictly avoiding all silicones or synthetic ingredients
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.