Ingredient review
Polypropylene Terephthalate
INCI: POLYPROPYLENE TEREPHTHALATE
A synthetic film-former that helps makeup and hair products stay put, but offers no active skincare benefit.
In plain English
Polypropylene terephthalate is a type of plastic-like polymer that forms a thin, flexible film on your skin or hair. In cosmetics, it helps makeup last longer without smudging or fading, and it can give hair products extra hold. Think of it as a clear, invisible shield that keeps your look in place, but it doesn't moisturize or treat your skin—it's purely about performance.
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
Polypropylene Terephthalate 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 Polypropylene Terephthalate.
- 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 polyester resin created from terephthalic acid and propylene glycol. It belongs to the same chemical family as PET plastics used in water bottles, but in cosmetics it's processed into a fine powder or liquid that dries into a flexible film.
How it works
When applied, the ingredient's molecules link together as the solvent evaporates, forming a continuous, flexible film on the skin or hair surface. This film physically locks in pigments and other ingredients, resisting water, sweat, and friction. It also thickens the product's texture, making it easier to apply evenly.
Pros
Excellent wear time
Forms a durable film that keeps makeup intact through sweat, humidity, and light rubbing, reducing the need for touch-ups.
Flexible finish
Unlike some stiff film-formers, it creates a pliable layer that moves with your skin or hair, preventing cracking or flaking.
Cons and cautions
No skincare benefit
It doesn't hydrate, soothe, or protect skin—it's purely a cosmetic enhancer, so it won't improve your skin's health.
Removal challenge
The strong film can be stubborn to remove; you'll likely need an oil-based or dual-phase makeup remover to avoid tugging at skin.
Best for
- People who want long-lasting, transfer-resistant makeup
- Those who use waterproof mascara or eyeliner and need reliable hold
Use caution if
- Individuals with very dry or dehydrated skin who prefer hydrating, breathable formulas
Usage tips
Safety summary
Polypropylene terephthalate is considered safe for topical use in cosmetics. It has low irritation and comedogenic potential, and no significant toxicity concerns have been identified at typical usage levels. However, it offers no active skincare benefits.
Research notes
Research on this specific ingredient is limited, but studies on similar polyester film-formers confirm their safety and efficacy as cosmetic film-forming agents. The CIR has reviewed related polymers and found them safe for use in leave-on and rinse-off products.
Common label clues
- Typical concentration
- Typically 1–10% in leave-on formulas
- Regulatory status
- Approved for use in cosmetics in the EU, US, and many other regions. The Cosmetic Ingredient Review (CIR) panel has evaluated similar polyester film-formers and found them safe at typical concentrations.
- Common uses
- Long-wear foundations, Waterproof mascaras, Lip products, Hair styling products
- Environmental note
- As a synthetic polymer, it is not biodegradable and may contribute to microplastic pollution if washed down drains. Some brands are moving toward bio-based alternatives.
Good to know
- Polypropylene terephthalate is not the same as polyethylene terephthalate (PET) used in plastic bottles, though they are chemically related.
- It is considered safe for use in cosmetics by major regulatory bodies when used as intended.
Common questions
What is Polypropylene Terephthalate in beauty products?
Polypropylene terephthalate is a type of plastic-like polymer that forms a thin, flexible film on your skin or hair. In cosmetics, it helps makeup last longer without smudging or fading, and it can give hair products extra hold. Think of it as a clear, invisible shield that keeps your look in place, but it doesn't moisturize or treat your skin—it's purely about performance.
What does Polypropylene Terephthalate do in a beauty product?
When applied, the ingredient's molecules link together as the solvent evaporates, forming a continuous, flexible film on the skin or hair surface. This film physically locks in pigments and other ingredients, resisting water, sweat, and friction. It also thickens the product's texture, making it easier to apply evenly.
Is Polypropylene Terephthalate safe for most people?
Polypropylene terephthalate is considered safe for topical use in cosmetics. It has low irritation and comedogenic potential, and no significant toxicity concerns have been identified at typical usage levels. However, it offers no active skincare benefits.
Who should be careful with Polypropylene Terephthalate?
Individuals with very dry or dehydrated skin who prefer hydrating, breathable formulas
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.