Ingredient review
Bis-Trimethoxysilylethyl Tetramethyldisiloxyethyl Dimethicone
INCI: BIS-TRIMETHOXYSILYLETHYL TETRAMETHYLDISILOXYETHYL DIMETHICONE
A gentle, non-comedogenic silicone that improves product feel and wear without clogging pores or causing irritation.
In plain English
This is a type of silicone that spreads easily and dries down to a soft, silky film on your skin or hair. It helps makeup last longer, blurs fine lines, and gives a smooth, non-greasy feel. Because it's non-comedogenic (won't clog pores) and low-irritation, it's generally safe for most skin types, including sensitive and acne-prone skin.
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
Bis-Trimethoxysilylethyl Tetramethyldisiloxyethyl 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 Bis-Trimethoxysilylethyl Tetramethyldisiloxyethyl 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 with multiple siloxane groups that crosslink to form a flexible, breathable film. It is designed to improve the sensory feel and durability of cosmetic products.
How it works
When applied, the molecules link together to create a thin, even layer that sits on top of the skin or hair. This film helps lock in moisture, smooths the surface, and provides a barrier against environmental factors. It also helps other ingredients stay in place longer.
Pros
Long-lasting wear
Creates a flexible film that helps makeup and sunscreen resist sweat, water, and rubbing, so you need fewer touch-ups.
Smooth, non-greasy feel
Spreads easily and dries to a silky, powdery finish that doesn't feel heavy or sticky on the skin.
Cons and cautions
Requires thorough cleansing
Because it forms a film, it may not rinse off with just water or a gentle cleanser. You may need an oil-based cleanser or double cleanse to remove it completely.
Not for silicone-free routines
If you prefer to avoid silicones for personal or environmental reasons, this ingredient won't fit your regimen.
Best for
- People with oily or combination skin who want a matte, long-lasting finish
- Anyone looking for a primer or sunscreen that stays put all day
Use caution if
- Those who strictly avoid silicones in their skincare or haircare routine
Usage tips
Safety summary
Bis-Trimethoxysilylethyl Tetramethyldisiloxyethyl Dimethicone is considered safe for cosmetic use. It has low irritation and comedogenic potential, making it suitable for sensitive and acne-prone skin. No significant safety concerns have been reported in peer-reviewed literature.
Research notes
Research on this specific silicone is limited, but the broader class of dimethicone crosspolymers is well-studied and considered safe. Studies show they do not penetrate the skin and are non-irritating. The Cosmetic Ingredient Review (CIR) has reviewed similar ingredients and found them safe for use.
Common label clues
- Typical concentration
- 1% to 10%
- Regulatory status
- Approved for use in cosmetics globally, including by the FDA (US) and EU CosIng database. The Cosmetic Ingredient Review (CIR) has deemed it safe at typical use concentrations.
- Common uses
- Primers, Sunscreens, Long-wear foundations, Hair serums, Leave-in conditioners
- Environmental note
- Silicones are generally not biodegradable, but this specific polymer is a high-molecular-weight crosspolymer, which may reduce its potential for environmental accumulation compared to smaller silicones. Some brands are moving toward biodegradable alternatives.
Good to know
- This ingredient is often found in 'long-wear' or '24-hour' makeup products.
- It is considered safe by the Cosmetic Ingredient Review (CIR) panel when used as directed.
Common questions
What is Bis-Trimethoxysilylethyl Tetramethyldisiloxyethyl Dimethicone in beauty products?
This is a type of silicone that spreads easily and dries down to a soft, silky film on your skin or hair. It helps makeup last longer, blurs fine lines, and gives a smooth, non-greasy feel. Because it's non-comedogenic (won't clog pores) and low-irritation, it's generally safe for most skin types, including sensitive and acne-prone skin.
What does Bis-Trimethoxysilylethyl Tetramethyldisiloxyethyl Dimethicone do in a beauty product?
When applied, the molecules link together to create a thin, even layer that sits on top of the skin or hair. This film helps lock in moisture, smooths the surface, and provides a barrier against environmental factors. It also helps other ingredients stay in place longer.
Is Bis-Trimethoxysilylethyl Tetramethyldisiloxyethyl Dimethicone safe for most people?
Bis-Trimethoxysilylethyl Tetramethyldisiloxyethyl Dimethicone is considered safe for cosmetic use. It has low irritation and comedogenic potential, making it suitable for sensitive and acne-prone skin. No significant safety concerns have been reported in peer-reviewed literature.
Who should be careful with Bis-Trimethoxysilylethyl Tetramethyldisiloxyethyl Dimethicone?
Those who strictly avoid silicones in their skincare or haircare 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.