What Is Peg-3 Trimethylolpropane Triacrylate?
PEG-3 Trimethylolpropane Triacrylate is a man-made ingredient created by joining acrylic acid to a small polyethylene glycol chain that sits on a trimethylolpropane backbone. The resulting molecule is a triester, meaning it has three reactive acrylic groups that can link together when exposed to light or heat, creating a thin flexible film on the skin.
The compound was first explored in the 1970s within the printing and coatings industries because of its quick-curing nature. Cosmetic chemists later noticed that the same property could help lock makeup in place and improve the feel of lotions, so it started appearing in beauty products in the early 2000s.
Manufacturing begins with trimethylolpropane derived from plant or petroleum sources. This base reacts with ethylene oxide to add three units of polyethylene glycol, then acrylic acid is attached to each arm. The process is carried out in closed reactors followed by purification to remove any leftover acids or solvents.
You will most often find PEG-3 Trimethylolpropane Triacrylate in long-wear foundations, peel-off masks, high-shine lip lacquers, nail coatings, waterproof sunscreens and transfer-resistant eyeliners where a durable yet comfortable film is needed.
Peg-3 Trimethylolpropane Triacrylate’s Cosmetic Benefits/Uses
In skincare and makeup formulas this ingredient pulls double duty, giving chemists a reliable tool for both texture and performance.
- Binding: Acts like a glue that holds pigments and other particles together so the final product applies evenly and stays put longer. This is especially useful in foundations, pressed powders and color cosmetics that must withstand sweat or humidity.
- Film forming: Creates a lightweight continuous layer on the skin or hair. The film helps seal in active ingredients, boosts shine and provides resistance to water or smudging without a heavy or sticky feel.
Who Can Use Peg-3 Trimethylolpropane Triacrylate
Most skin types tolerate this ingredient well because it stays on the surface and forms a breathable film rather than soaking deep into the skin. Dry, oily and combination skin can all benefit from its long-wear hold. Very sensitive or eczema-prone skin may want to proceed with caution since acrylate compounds, while rare offenders, have been linked to contact allergies in a small number of people.
The molecule is made entirely from petrochemical or plant-based feedstocks and contains no animal derivatives, so it is generally considered suitable for vegans and vegetarians. Always check the full product label though, as other ingredients in the same formula might not meet cruelty-free or vegan standards.
Current safety data shows minimal absorption through intact skin, so products using Peg-3 Trimethylolpropane Triacrylate are not expected to pose a risk during pregnancy or while breastfeeding. That said, this is not medical advice and anyone who is pregnant or nursing should review their skin care routine with a qualified health professional to be on the safe side.
The ingredient does not make skin more sensitive to sunlight and does not interfere with sunscreen filters, so users do not need to take extra UV precautions beyond normal sun protection habits.
Potential Side Effects/Adverse Reactions
Responses to topical Peg-3 Trimethylolpropane Triacrylate vary from person to person. The points below outline potential side effects, but most people will not notice any problems when the ingredient is used correctly in a finished cosmetic product.
- Skin irritation A small number of users may experience redness, itching or a burning sensation, especially if the formula also contains high levels of alcohol or fragrance
- Allergic contact dermatitis Individuals already sensitized to acrylates could develop localized swelling, rash or blisters at the application site
- Eye stinging If a product accidentally gets into the eyes the film former can cause watering and temporary discomfort
- Dryness or tight feeling The protective film can reduce transepidermal water loss but may also feel tight or drying on very dehydrated skin if not paired with enough humectants
If you notice any of these effects stop using the product and consult a healthcare professional if symptoms persist
Comedogenic Rating
Rating: 1 / 5
PEG-3 Trimethylolpropane Triacrylate has a very low likelihood of clogging pores because its large, branched structure stays on the surface and does not mix with skin oils. Finished formulas typically use it at low levels, further reducing any risk of buildup inside pores.
Suitable for acne-prone or breakout-prone skin in most cases.
As with any film former, heavy layers combined with occlusive ingredients could trap sweat and oil on extremely oily skin, so lightweight application is best.
Summary
PEG-3 Trimethylolpropane Triacrylate works as a binder and film former. Its three acrylic arms link together when the product dries, creating a flexible mesh that holds pigments in place and forms a water-resistant shield on skin or hair. This boosts wear time and shine without a greasy feel.
The ingredient sits in the middle tier of popularity, common in long-wear makeup and peel-off masks but absent from many everyday creams or cleansers.
Current data shows it is generally safe with low irritation and comedogenic potential. Still, everyone’s skin is unique so it is smart to patch test any new product that contains it before full use.