Ingredient review
PEG/PPG-27/9 Butyl Ether Dimethicone
INCI: PEG/PPG-27/9 Butyl Ether Dimethicone
A versatile silicone emulsifier that helps create smooth, spreadable formulas without a greasy feel.
In plain English
This ingredient is a type of silicone that acts like a bridge between water and oil in a product. It helps mix ingredients that normally don't combine well, giving creams and lotions a silky, lightweight texture that spreads easily on skin. It also leaves a soft, non-sticky finish and can help other ingredients spread more evenly.
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-27/9 Butyl Ether 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-27/9 Butyl Ether 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 modified silicone polymer with both water-loving (PEG/PPG) and oil-loving (butyl ether) parts, allowing it to stabilize mixtures of water and oil in cosmetic products.
How it works
It sits at the boundary between water and oil droplets, reducing surface tension so they blend into a stable emulsion. This creates a uniform, smooth product that feels light on the skin and helps active ingredients spread evenly.
Pros
Lightweight feel
Provides a silky, non-oily texture that absorbs quickly, making it ideal for daytime use and under makeup.
Stable emulsions
Helps keep water and oil mixed together, preventing separation and ensuring consistent product performance over time.
Cons and cautions
PEG concerns
Contains PEG chains, which can be contaminated with ethylene oxide or 1,4-dioxane during manufacturing, though reputable brands purify their ingredients.
Not for all skin types
Some people with very sensitive or reactive skin may find silicones or PEG derivatives irritating, though this is rare.
Best for
- People who prefer lightweight, non-greasy moisturizers
- Those using layered skincare routines who want fast-absorbing products
Use caution if
- Individuals with known sensitivity to PEG compounds or silicones
Usage tips
Safety summary
Generally considered safe for most people when used in typical cosmetic concentrations. The PEG component is purified to remove impurities, and the silicone backbone is well-tolerated. Rare irritation may occur in sensitive individuals.
Research notes
The Cosmetic Ingredient Review (CIR) panel has reviewed PEG/PPG dimethicones and concluded they are safe as used in cosmetics. No significant human or animal studies raise concerns at typical exposure levels.
Common label clues
- Typical concentration
- 1% to 10%
- Regulatory status
- Approved for use in cosmetics in the US, EU, and many other regions. The Cosmetic Ingredient Review (CIR) panel has evaluated similar PEG/PPG dimethicones and found them safe at typical concentrations.
- Common uses
- Moisturizers, Sunscreens, Foundations, Serums, Hair conditioners
- Environmental note
- Silicones can be persistent in the environment, but this ingredient is used in small amounts and is often removed during wastewater treatment. Some brands are moving toward biodegradable alternatives.
Good to know
- This ingredient is often used in 'silicone-based' primers and sunscreens for its elegant feel.
- It is considered safe by major cosmetic ingredient review panels at typical use levels.
Common questions
What is PEG/PPG-27/9 Butyl Ether Dimethicone in beauty products?
This ingredient is a type of silicone that acts like a bridge between water and oil in a product. It helps mix ingredients that normally don't combine well, giving creams and lotions a silky, lightweight texture that spreads easily on skin. It also leaves a soft, non-sticky finish and can help other ingredients spread more evenly.
What does PEG/PPG-27/9 Butyl Ether Dimethicone do in a beauty product?
It sits at the boundary between water and oil droplets, reducing surface tension so they blend into a stable emulsion. This creates a uniform, smooth product that feels light on the skin and helps active ingredients spread evenly.
Is PEG/PPG-27/9 Butyl Ether Dimethicone safe for most people?
Generally considered safe for most people when used in typical cosmetic concentrations. The PEG component is purified to remove impurities, and the silicone backbone is well-tolerated. Rare irritation may occur in sensitive individuals.
Who should be careful with PEG/PPG-27/9 Butyl Ether Dimethicone?
Individuals with known sensitivity to PEG compounds or silicones
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.