Poloxamer 338 …
INCI: POLOXAMER 338/PPG-51/SMDI COPOLYMER
Reviewed by Rosie · Last updated 18 Aug 2026
What Is Poloxamer 338 …?
Poloxamer 338/PPG-51/SMDI Copolymer is a copolymer of Poloxamer 338, PPG-51 and saturated methylene diphenyldiisocyanate (SMDI) monomers.
Its declared cosmetic function is emulsion stabilising.
Source: European Commission CosIng inventory.
From the Clinic
Not sure what your skin actually needs?
Two minutes, a few questions, and we’ll point you at what matters — no guesswork.
Take the skin quizRelated Ingredients
Aminomethyl Propanol
Used to adjust and control the pH of a formulation
Decyloxazolidinone
Functions as a preservative
Disodium Phosphate
“Behind-the-scenes” ingredient commonly used as a buffering agent/pH adjuster
Disteardimonium Hectorite
Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer
Versatile polymer widely used in skin care and makeup
Hypochlorous Acid
Naturally occurring oxidizing ingredient
Learn More About Skincare Ingredients
Explore our comprehensive ingredient glossary to understand what's in your products.
Browse All IngredientsShop Our Products
Find professional skincare solutions at Skintique.