What it is
PPG-4-Ceteth-20 is an alkoxylated cetyl alcohol bearing roughly 4 propylene-glycol (PPG) units and 20 ethylene-oxide (ceteth) units, which gives it both oil-loving and water-loving regions. This amphiphilic structure lets it emulsify oils into water and solubilize lipophilic ingredients such as fragrances or some UV filters. In sunscreens it helps create a stable, light, easily spread formula.
Safety & warnings
This nonionic emulsifier is generally well tolerated at typical use levels. As an ethoxylated material it can carry trace 1,4-dioxane, which is controlled during manufacturing. It is not a recognized fragrance allergen.
Origin & sourcing
Synthetic; made by reacting cetyl alcohol with propylene oxide and ethylene oxide.
Questions everyone asks
What does PPG-4-Ceteth-20 do?
It is a nonionic emulsifier and solubilizer that helps oil and water mix and keeps the formula stable and uniform.
Is PPG-4-Ceteth-20 a fatty alcohol?
It is derived from the fatty alcohol cetyl alcohol but is modified with propylene glycol and ethylene oxide units to make it an emulsifier.