Ingredient review
PEG/PPG SMDI Copolymer
INCI: BIS-METHOXY PEG-13 PEG-438/PPG-110 SMDI COPOLYMER
A synthetic polymer that helps products spread smoothly and resist water, 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 other ingredients stay put and makes the product feel silky. Think of it like a gentle glue that holds your makeup or sunscreen in place without being sticky.
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
PEG/PPG SMDI 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 PEG/PPG SMDI 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 synthetic molecule made by linking polyethylene glycol (PEG) and polypropylene glycol (PPG) chains with a special linking agent called SMDI. It is designed to create a smooth, water-resistant layer on the skin.
How it works
When applied, the polymer spreads into a thin, even film that dries down to a flexible coating. This film helps active ingredients (like sunscreen filters) stay on the skin longer and prevents makeup from smudging. It also gives products a silky, non-greasy feel.
Pros
Enhances water resistance
Helps sunscreen and makeup stay effective longer when you sweat or swim, reducing the need for frequent reapplication.
Improves product feel
Gives a silky, non-greasy texture that makes application smooth and even, without a sticky residue.
Cons and cautions
May feel heavy on oily skin
The film can feel like a layer on the skin, which some people with oily skin find uncomfortable or pore-clogging.
Requires double cleansing
Because it forms a water-resistant film, it may not rinse off with just water or a gentle cleanser, needing an oil-based cleanser first.
Best for
- People who want long-lasting, water-resistant sunscreen or makeup
- Those with normal to dry skin who enjoy a smooth, protective feel
Use caution if
- Individuals with very oily or acne-prone skin who prefer lightweight, non-film-forming products
- Anyone who dislikes the sensation of a film on their skin
Usage tips
Safety summary
Generally recognized as safe for topical use at typical concentrations. Low irritation and comedogenic risk. No significant safety concerns reported in cosmetic use.
Research notes
Limited independent studies on this specific polymer, but similar PEG/PPG copolymers have a long history of safe use in cosmetics. The ingredient is well-tolerated in patch tests and does not penetrate the skin barrier significantly.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics in the US, EU, and other major markets. It is not a restricted ingredient, but manufacturers must follow concentration limits based on product type.
- Common uses
- Sunscreens, Waterproof makeup, Long-wear foundations, Eye creams
- Environmental note
- As a synthetic polymer, it is not biodegradable and may accumulate in the environment. Some brands are moving toward biodegradable alternatives.
Good to know
- This polymer is often used in combination with other film-formers to boost water resistance
- It is considered safe for use in cosmetics by major regulatory bodies
Common questions
What is PEG/PPG SMDI Copolymer in beauty products?
This is a man-made ingredient that forms a thin, flexible film on your skin. It helps other ingredients stay put and makes the product feel silky. Think of it like a gentle glue that holds your makeup or sunscreen in place without being sticky.
What does PEG/PPG SMDI Copolymer do in a beauty product?
When applied, the polymer spreads into a thin, even film that dries down to a flexible coating. This film helps active ingredients (like sunscreen filters) stay on the skin longer and prevents makeup from smudging. It also gives products a silky, non-greasy feel.
Is PEG/PPG SMDI Copolymer safe for most people?
Generally recognized as safe for topical use at typical concentrations. Low irritation and comedogenic risk. No significant safety concerns reported in cosmetic use.
Who should be careful with PEG/PPG SMDI Copolymer?
Individuals with very oily or acne-prone skin who prefer lightweight, non-film-forming products Anyone who dislikes the sensation of a film on their skin
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.