Ingredient review
Phenylpropyldimethylsiloxysilicate
INCI: PHENYLPROPYLDIMETHYLSILOXYSILICATE
A gentle silicone that forms a breathable, water-resistant film to lock in moisture and improve product wear.
In plain English
This is a type of silicone that spreads easily and dries down to a very thin, flexible film on your skin or hair. Think of it like a lightweight, invisible shield that helps keep moisture in and water or sweat out, without feeling heavy or greasy. It's often used in sunscreens and long-wear makeup to help the product stay put and feel silky smooth.
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
Phenylpropyldimethylsiloxysilicate 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 Phenylpropyldimethylsiloxysilicate.
- 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 that combines a phenyl group (an aromatic ring) with a siloxysilicate backbone. It is designed to form a uniform, water-resistant film on surfaces.
How it works
When applied, the silicone molecules link together as the solvent evaporates, creating a continuous, flexible film. This film acts as a physical barrier that reduces water loss from the skin (improving hydration) and helps other ingredients (like UV filters or pigments) adhere better and last longer.
Pros
Lightweight barrier
Forms a thin, flexible film that helps keep moisture in and environmental irritants out, without feeling heavy or sticky.
Boosts wear time
Helps sunscreen and makeup resist water, sweat, and friction, so you don't have to reapply as often during the day.
Cons and cautions
Silicone removal
Because it forms a water-resistant film, it may not wash off with a gentle cleanser alone. You may need an oil-based cleanser or double cleansing to fully remove it.
Not for silicone-free fans
If you prefer to avoid silicones for personal or environmental reasons, this ingredient won't fit your routine.
Best for
- People who want long-lasting, water-resistant sunscreen or makeup
- Those with normal to dry skin looking for a lightweight moisture barrier
Use caution if
- Individuals who strictly avoid silicones in their skincare or haircare routine
Usage tips
Safety summary
Phenylpropyldimethylsiloxysilicate is considered safe for use in cosmetics at typical concentrations. It has low irritation and comedogenic potential. No significant safety concerns have been raised by regulatory bodies.
Research notes
Research on this specific silicone is limited, but the broader class of siloxysilicates is well-studied and widely used for film-forming and water-resistance. Safety assessments by the Cosmetic Ingredient Review (CIR) panel have found similar silicones safe for cosmetic use.
Common label clues
- Typical concentration
- 1–10%
- Regulatory status
- Approved for use in cosmetics in the US (FDA), EU, and many other regions. No specific restrictions beyond general cosmetic safety requirements.
- Common uses
- Sunscreens, Primers, Long-wear foundations, Hair serums, Water-resistant products
- Environmental note
- Like many silicones, it is not biodegradable. However, it is not classified as bioaccumulative. Some brands are moving toward biodegradable alternatives, but this remains a common, effective choice.
Good to know
- This silicone is considered non-comedogenic for most skin types, but everyone's skin is different—patch test if you're prone to breakouts.
- It is often used in combination with other silicones to fine-tune the feel and performance of a product.
Common questions
What is Phenylpropyldimethylsiloxysilicate in beauty products?
This is a type of silicone that spreads easily and dries down to a very thin, flexible film on your skin or hair. Think of it like a lightweight, invisible shield that helps keep moisture in and water or sweat out, without feeling heavy or greasy. It's often used in sunscreens and long-wear makeup to help the product stay put and feel silky smooth.
What does Phenylpropyldimethylsiloxysilicate do in a beauty product?
When applied, the silicone molecules link together as the solvent evaporates, creating a continuous, flexible film. This film acts as a physical barrier that reduces water loss from the skin (improving hydration) and helps other ingredients (like UV filters or pigments) adhere better and last longer.
Is Phenylpropyldimethylsiloxysilicate safe for most people?
Phenylpropyldimethylsiloxysilicate is considered safe for use in cosmetics at typical concentrations. It has low irritation and comedogenic potential. No significant safety concerns have been raised by regulatory bodies.
Who should be careful with Phenylpropyldimethylsiloxysilicate?
Individuals 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.