Ingredient review
PEG/PPG-18/12 Dimethicone
INCI: PEG/PPG-18/12 Dimethicone
A gentle silicone emulsifier that improves product texture and spreadability without clogging pores.
In plain English
PEG/PPG-18/12 Dimethicone is a modified silicone that acts like a bridge between water and oil in a formula. It helps ingredients mix smoothly, gives a silky feel, and prevents products from separating. It's very mild on skin and unlikely to cause breakouts.
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
- semi synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
PEG/PPG-18/12 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-18/12 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 silicone copolymer (a large molecule made of silicone and polyethylene/polypropylene glycol chains) used primarily as an emulsifier and skin-conditioning agent.
How it works
It reduces surface tension between water and oil phases, allowing them to form a stable, uniform mixture. It also leaves a thin, breathable film on skin that feels smooth and non-greasy.
Pros
Excellent emulsifier
Stabilizes water-and-oil blends, preventing separation and ensuring a consistent texture every time you use the product.
Silky, non-greasy feel
Leaves a smooth, velvety finish on skin without clogging pores or feeling heavy, making it ideal for lightweight moisturizers and primers.
Cons and cautions
Not biodegradable
As a silicone derivative, it does not break down easily in the environment, which may be a concern for eco-conscious users.
Can require double cleansing
Because it forms a film on skin, it may not rinse off completely with water alone, often needing an oil-based cleanser for thorough removal.
Best for
- People with normal to oily skin who want a lightweight, silky finish
- Anyone using water-and-oil blend products like moisturizers or sunscreens
Use caution if
- Those who strictly avoid all silicones in their routine
- Individuals with known sensitivity to PEG compounds (rare)
Usage tips
Safety summary
PEG/PPG-18/12 Dimethicone has a strong safety profile with very low irritation and comedogenic potential. It is well-tolerated by most skin types, including sensitive skin. The main concerns are environmental persistence and the need for thorough cleansing.
Research notes
Safety assessments by the Cosmetic Ingredient Review (CIR) panel have concluded that PEG/PPG dimethicone copolymers are safe in cosmetic formulations at concentrations up to 10%. No significant skin irritation or sensitization was observed in clinical studies.
Common label clues
- Typical concentration
- 1% to 10%
- Regulatory status
- Approved for use in cosmetics in the EU, US, and many other regions. The CIR panel has deemed it safe as used in rinse-off and leave-on products.
- Common uses
- Moisturizers, Sunscreens, Foundations, Primers, Hair conditioners
- Environmental note
- Silicone derivatives like this one are not readily biodegradable and can accumulate in aquatic environments. Some brands are moving toward more eco-friendly alternatives.
Good to know
- PEG/PPG-18/12 Dimethicone is considered safe by the Cosmetic Ingredient Review (CIR) panel at typical use levels.
- It is often used in 'water-in-silicone' emulsions, which are popular in long-wear makeup and sunscreens.
Common questions
What is PEG/PPG-18/12 Dimethicone in beauty products?
PEG/PPG-18/12 Dimethicone is a modified silicone that acts like a bridge between water and oil in a formula. It helps ingredients mix smoothly, gives a silky feel, and prevents products from separating. It's very mild on skin and unlikely to cause breakouts.
What does PEG/PPG-18/12 Dimethicone do in a beauty product?
It reduces surface tension between water and oil phases, allowing them to form a stable, uniform mixture. It also leaves a thin, breathable film on skin that feels smooth and non-greasy.
Is PEG/PPG-18/12 Dimethicone safe for most people?
PEG/PPG-18/12 Dimethicone has a strong safety profile with very low irritation and comedogenic potential. It is well-tolerated by most skin types, including sensitive skin. The main concerns are environmental persistence and the need for thorough cleansing.
Who should be careful with PEG/PPG-18/12 Dimethicone?
Those who strictly avoid all silicones in their routine 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.