Ingredient review
Hydroxypropyltrisiloxyl IPDI/PEG-23 Copolymer
INCI: HYDROXYPROPYLTRISILOXYL IPDI/PEG-23 COPOLYMER
A synthetic silicone polymer that helps makeup and sunscreen stay put longer, but may feel heavy on some skin types.
In plain English
This is a man-made ingredient that forms a thin, flexible film on your skin. It helps products like foundation, sunscreen, and mascara resist water, sweat, and smudging. Think of it as a clear, invisible shield that keeps your makeup in place. It's part of a family of silicones, which are known for their smooth, silky feel, but some people find them too heavy or pore-clogging.
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
Hydroxypropyltrisiloxyl IPDI/PEG-23 Copolymer 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 Hydroxypropyltrisiloxyl IPDI/PEG-23 Copolymer.
- 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 large molecule made by combining a silicone backbone with a polyurethane (IPDI) and a water-soluble chain (PEG-23). It is a film-forming polymer designed to create a durable, water-resistant layer on skin or hair.
How it works
When applied, the solvent evaporates and the polymer chains link together to form a continuous, flexible film. This film physically blocks water and oil from breaking down the product underneath, extending wear time. The silicone part gives a smooth, non-tacky feel, while the PEG part helps it spread evenly.
Pros
Excellent water resistance
Creates a durable film that helps sunscreen and makeup stay effective even when you sweat or swim.
Smooth, silky feel
The silicone component gives a non-greasy, velvety texture that many people enjoy on their skin.
Cons and cautions
Can feel heavy
On oily or combination skin, the film may feel thick or suffocating, potentially leading to clogged pores.
Requires thorough removal
Standard cleansers may not fully remove this polymer, so you may need an oil-based cleanser or micellar water to avoid residue.
Best for
- People who need long-wearing, waterproof makeup or sunscreen
- Those with normal to dry skin who want a smooth, protective layer
Use caution if
- Individuals with very oily or acne-prone skin who prefer lightweight, non-film-forming products
Usage tips
Safety summary
Considered safe for topical use in cosmetics at typical concentrations. Low irritation and comedogenic risk, but individual reactions vary. Always patch test if you have sensitive skin.
Research notes
Limited independent studies on this specific polymer, but similar film-forming silicones have a long history of safe use in cosmetics. The main concern is cosmetic elegance and removal, not toxicity.
Common label clues
- Typical concentration
- 1% to 10%
- Regulatory status
- Approved for use in cosmetics in the EU, US, and many other regions. No specific restrictions beyond general cosmetic safety requirements.
- Common uses
- Sunscreens, Long-wear foundations, Waterproof mascara, Lip products
- Environmental note
- As a silicone-based polymer, it may not be biodegradable. However, its environmental impact is not well-studied, and it is not known to bioaccumulate significantly.
Good to know
- This polymer is often listed near the end of ingredient lists because it's used in small amounts.
- It is not the same as dimethicone or other common silicones; it's a specialized film former.
Common questions
What is Hydroxypropyltrisiloxyl IPDI/PEG-23 Copolymer in beauty products?
This is a man-made ingredient that forms a thin, flexible film on your skin. It helps products like foundation, sunscreen, and mascara resist water, sweat, and smudging. Think of it as a clear, invisible shield that keeps your makeup in place. It's part of a family of silicones, which are known for their smooth, silky feel, but some people find them too heavy or pore-clogging.
What does Hydroxypropyltrisiloxyl IPDI/PEG-23 Copolymer do in a beauty product?
When applied, the solvent evaporates and the polymer chains link together to form a continuous, flexible film. This film physically blocks water and oil from breaking down the product underneath, extending wear time. The silicone part gives a smooth, non-tacky feel, while the PEG part helps it spread evenly.
Is Hydroxypropyltrisiloxyl IPDI/PEG-23 Copolymer safe for most people?
Considered safe for topical use in cosmetics at typical concentrations. Low irritation and comedogenic risk, but individual reactions vary. Always patch test if you have sensitive skin.
Who should be careful with Hydroxypropyltrisiloxyl IPDI/PEG-23 Copolymer?
Individuals with very oily or acne-prone skin who prefer lightweight, non-film-forming products
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.