What it is
PPG-17 is a liquid polypropylene glycol oligomer used to soften skin, help retain moisture, and dissolve or carry other ingredients in a formula. In sunscreens it can improve spreadability and contribute to a smooth, conditioned feel. Its properties fall between those of more water-loving glycols and more oil-loving emollients depending on chain length.
Safety & warnings
Polypropylene glycols of this type are generally well tolerated at cosmetic use levels and are not typically associated with significant irritation.
Origin & sourcing
Synthetic. It is produced by polymerizing propylene oxide to an average chain length of about 17 units.
Questions everyone asks
What is PPG-17 used for in sunscreen?
It works as an emollient, humectant, and solvent, helping soften skin, hold moisture, and improve how the product spreads.
What does the number 17 mean?
It indicates the average number of repeating propylene glycol units in the polymer, which influences its texture and how oil- or water-compatible it is.