What Is Peg-15 Trimethylolpropane Triacrylate?
PEG-15 Trimethylolpropane Triacrylate is a synthetically produced ingredient created by linking acrylic acid to a polyethylene glycol-based form of trimethylolpropane that holds about 15 ethylene oxide units. The result is a triple ester that behaves like a liquid resin, valued for the smooth flexible film it can leave on skin or hair.
Its story begins in the coatings and printing industry, where similar resins were prized for forming clear durable films once exposed to light or air. Formulators in personal care noticed the same qualities could lock makeup in place, keep glitter from flaking and boost the wear time of many products. Over the past couple of decades the material has moved from industrial use into mainstream beauty labs.
Manufacturing involves first ethoxylating trimethylolpropane with ethylene oxide to reach the desired chain length of 15 units. This intermediate is then reacted with acrylic acid in the presence of catalysts to create a triacrylate. Strict purification follows to remove residual monomers, giving a cosmetic-grade ingredient that meets safety limits.
You will most often see PEG-15 Trimethylolpropane Triacrylate in long wear foundations, liquid and gel eyeliners, nail polish, glitter gels, peel-off masks and some waterproof sunscreens. Anywhere a thin even film is needed to bind pigments or shimmer to skin or nails, this ingredient is a popular choice.
Peg-15 Trimethylolpropane Triacrylate’s Cosmetic Benefits/Uses
In formulas this ingredient serves two main purposes that improve how a product looks, feels and lasts on the skin.
- Binding: Acts like a glue that holds pigments, powders and sparkles together so they stay evenly dispersed in the product and adhere better to the skin or nail surface. This reduces fallout, streaking and the need for frequent touch-ups.
- Film Forming: Creates a flexible, transparent layer that locks the product in place, boosts water and sweat resistance and imparts a smooth finish without a heavy feel.
Who Can Use Peg-15 Trimethylolpropane Triacrylate
This film forming resin is considered friendly for most skin types including oily, combination, normal and dry since it sits on the surface rather than penetrating deeply. Sensitive or compromised skin may find any acrylate resin a bit occlusive or mildly irritating, so patchy or inflamed areas could feel uncomfortable if a heavy layer is applied.
The ingredient is made entirely from synthetic raw materials and contains no animal derivatives, making it suitable for both vegetarians and vegans. As always, those who avoid animal testing may want to verify the finished brand’s cruelty free policy.
No specific warnings exist for pregnant or breastfeeding women. Current safety assessments classify the polymer as non-reproductive toxic. That said this is not medical advice and anyone who is expecting or nursing should show the full ingredient list to their doctor or midwife before use just to be safe.
PEG-15 Trimethylolpropane Triacrylate does not increase photosensitivity and can even improve the wear of sunscreens. It is also odorless and colorless so it rarely interferes with fragrance free or dye free claims.
Potential Side Effects/Adverse Reactions
Side effects and reactions to the topical application of PEG-15 Trimethylolpropane Triacrylate can vary from person to person. The points below outline potential issues only and most users will not experience them when the ingredient is used at the low levels typical in cosmetics.
- Mild skin irritation such as redness stinging or itching
- Contact dermatitis in individuals already sensitive to acrylates
- Transient eye irritation if the product migrates into the eyes
- Occlusive sensation or clogged pores in those prone to congestion when very thick layers are applied
If any uncomfortable reaction develops stop using the product and seek advice from a qualified healthcare professional.
Comedogenic Rating
Rating: 1 / 5
PEG-15 Trimethylolpropane Triacrylate is a large water-soluble polymer that remains on the skin’s surface and contains no fatty acids or heavy oils that typically clog pores. Laboratory and anecdotal reports show a very low tendency to provoke comedones, which is why it earns a score of 1 instead of a perfect 0. The slight uptick accounts for the fact that, when applied in thick layers or in very occlusive formulas, the resulting film could trap sweat or debris and indirectly contribute to congestion in a small subset of users.
Overall this ingredient is considered suitable for people prone to acne or breakouts, especially when used in lightweight makeup or skin care.
Because the polymer is water-compatible it usually washes off cleanly with regular cleansing, further reducing the risk of buildup over time.
Summary
PEG-15 Trimethylolpropane Triacrylate works as a binder and film former. It glues pigments and shimmer together so they stay evenly suspended then dries to a clear flexible layer that resists water and sweat, giving makeup and nail products longer wear without a heavy feel.
While it is not the most famous name on an ingredient list it enjoys steady popularity in long-wear foundations, eyeliners, glitter gels and peel-off masks where reliable adhesion is a must. Formulators value its performance and consumer feedback is generally positive.
Safety assessments find the polymer non-sensitizing and non-toxic at cosmetic use levels though any ingredient can still bother very reactive skin. When trying a new product that includes this resin it is wise to perform a small patch test first and monitor for redness or itching before full-face application.