What it is
Trimethylolpropane Triethylhexanoate is a branched triester made from trimethylolpropane and ethylhexanoic acid. It is a low-viscosity oil that spreads easily, imparts a smooth non-greasy feel, and can dissolve or carry other ingredients such as pigments and UV filters. Its branched structure gives it good oxidative stability and a light skin feel, making it common in color cosmetics and sun care.
Safety & warnings
This ester is generally well tolerated and considered low in irritation potential. It is not a recognized fragrance allergen.
Origin & sourcing
Synthetic. It is produced by esterifying trimethylolpropane with 2-ethylhexanoic acid.
Questions everyone asks
What does this ester do in makeup and sunscreen?
It acts as a light emollient and solvent, helping spread the product, dissolve pigments and filters, and leave a smooth, non-greasy finish.
Is it oxidatively stable?
Its branched ester structure gives it good resistance to oxidation, which supports formula stability.