Ingredient review
Butyldimethiconyl Propoxyethylcarbamoylpropyl Silsesquioxane
INCI: Butyldimethiconyl Propoxyethylcarbamoylpropyl Silsesquioxane
A high-tech silicone that creates a flexible, breathable film on skin to improve product wear and water resistance without feeling heavy.
In plain English
This is a silicone ingredient that forms a thin, flexible film on your skin. It helps makeup and skincare stay put longer, resist sweat and water, and feel smooth to the touch. Think of it like a lightweight, invisible shield that doesn't clog pores or feel greasy.
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
Butyldimethiconyl Propoxyethylcarbamoylpropyl Silsesquioxane 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 Butyldimethiconyl Propoxyethylcarbamoylpropyl Silsesquioxane.
- 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 designed to create a durable yet flexible film on the skin. It belongs to the silsesquioxane family, which are known for their ability to form a breathable, water-resistant layer.
How it works
When applied, the molecules link together to form a continuous, flexible film on the skin's surface. This film helps lock in other ingredients, smooths the skin's texture, and provides a barrier that resists water and friction. It also helps pigments in makeup stay in place longer.
Pros
Long-lasting wear
Helps makeup and skincare stay put for hours, reducing the need for touch-ups.
Water-resistant barrier
Creates a protective layer that resists sweat and humidity, ideal for active days or humid climates.
Cons and cautions
Requires double cleansing
Because it forms a film, it may not wash off with a gentle cleanser alone; an oil-based cleanser or micellar water is often needed.
Not for silicone-free routines
If you avoid silicones for personal or environmental reasons, this ingredient is not suitable.
Best for
- Anyone looking for long-wearing makeup or water-resistant sunscreen
- People with normal to oily skin who want a smooth, matte finish
Use caution if
- Those who strictly avoid silicones in their routine
Usage tips
Safety summary
Extensively used in cosmetics with a strong safety profile. Low irritation and comedogenic risk. No significant safety concerns reported in regulatory reviews.
Research notes
Silicone film formers like this one are well-studied for their safety and efficacy in cosmetics. They are considered safe at typical use concentrations and are not known to cause skin sensitization.
Common label clues
- Typical concentration
- 1% to 10%
- Regulatory status
- Approved for use in cosmetics globally, including by the U.S. FDA and EU CosIng database, with no known restrictions.
- Common uses
- Long-wear foundations, Sunscreens, Primers, Water-resistant products
- Environmental note
- As a silicone compound, it may not be biodegradable. Some consumers choose silicone-free options for environmental reasons.
Good to know
- This ingredient is often found in 'transfer-proof' or '24-hour wear' makeup formulas.
- It is considered non-comedogenic and safe for most skin types.
Common questions
What is Butyldimethiconyl Propoxyethylcarbamoylpropyl Silsesquioxane in beauty products?
This is a silicone ingredient that forms a thin, flexible film on your skin. It helps makeup and skincare stay put longer, resist sweat and water, and feel smooth to the touch. Think of it like a lightweight, invisible shield that doesn't clog pores or feel greasy.
What does Butyldimethiconyl Propoxyethylcarbamoylpropyl Silsesquioxane do in a beauty product?
When applied, the molecules link together to form a continuous, flexible film on the skin's surface. This film helps lock in other ingredients, smooths the skin's texture, and provides a barrier that resists water and friction. It also helps pigments in makeup stay in place longer.
Is Butyldimethiconyl Propoxyethylcarbamoylpropyl Silsesquioxane safe for most people?
Extensively used in cosmetics with a strong safety profile. Low irritation and comedogenic risk. No significant safety concerns reported in regulatory reviews.
Who should be careful with Butyldimethiconyl Propoxyethylcarbamoylpropyl Silsesquioxane?
Those who strictly avoid silicones in their routine
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.