What it is
Propylene glycol stearate SE is the same propylene glycol and stearic acid ester modified into a self-emulsifying (SE) form by including a small amount of an anionic surfactant such as a soap. This self-emulsifying property lets it form oil-in-water emulsions more readily, making it convenient for building creams and lotions with a smooth, conditioned feel. It is frequently used in moisturizers and sunscreen emulsions where reliable, easy emulsification is desired.
Safety & warnings
Propylene glycol stearate SE is generally well tolerated at cosmetic use levels and is not commonly linked to irritation. The small amount of soap-type surfactant in the self-emulsifying grade makes it mildly alkaline in nature, but this is buffered within finished formulas. It is not a known fragrance allergen.
Origin & sourcing
Synthetic, based on propylene glycol stearate with an added anionic emulsifier to make it self-emulsifying.
Questions everyone asks
What does the SE mean in propylene glycol stearate SE?
SE stands for self-emulsifying, meaning a small amount of anionic surfactant is included so the ingredient can form emulsions more easily.
Why use propylene glycol stearate SE in a sunscreen?
It helps create stable oil-in-water emulsions while also adding emollient body and a smooth feel to the finished cream.