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PEG-180

Last update on Oct 16, 2025

Peg-180, derived from petroleum, is a part of the large polyethylene glycol family. Its water-loving properties help it attract and retain moisture on the skin. Due to its large molecular size, it does not penetrate the skin and stays on the surface, making it safe. In formulations, Peg-180 helps dissolve oil-soluble ingredients and evenly distributes actives, maintaining a smooth and rich, consistent texture. Being non-greasy in nature, it gives a light, non-sticky finish to creams, lotions, serums, gels, and cleansers. Additionally, it is odorless and compatible with a wide range of cosmetic ingredients. Overall, Peg-180 is gentle, safe, and non-comedogenic, making it a popular choice for obtaining smooth, stable textures.

CAS Number: 25322-68-3Chem/IUPAC Name: Poly(oxy-1,2-ethanediyl), .alpha.-hydro-.omega.-hydroxy-, (180 mol EO average molar ratio)EINECS/ELINCS No: COSING REF No: 77812

What is PEG-180 used for?

  • Humectant - Peg-180 attracts moisture from the environment and deeper layers of the skin and holds it on the surface to keep skin hydrated and nourished. It gives the skin a smooth, supple texture.
  • Solvent - Peg-180 is a water-loving molecule that helps dissolve oil-based ingredients into water-based systems to achieve a uniform and stable product. It also helps evenly distribute actives in formulations. By improving the consistency and texture, Peg-180 further improves the spreadability of beauty products.
  • Hair conditioning - In hair care products like shampoos and conditioners, Peg-180 forms a film on the shafts and conditions them - reducing frizziness and tangling.

Origin

Peg-180 is made by reacting 180 molecules of ethylene oxide with water or ethylene glycol. The higher the number of molecules, the greater the thickness of the ingredient, and therefore, it is less penetrative. In its raw form, Peg-180 appears as an odorless white solid or waxy flakes. It is highly soluble in water. The final ingredient is purified before use in cosmetics to remove impurities like 1,4-dioxane.

What does PEG-180 do in a formulation?

HUMECTANT|
BINDING|
SOLVENT|
HAIR CONDITIONING

Safety Profile

Peg-180 is safe and non-toxic at recommended concentrations. It is non-sensitizing, non-irritating, and non-comedogenic. It is not absorbed into the skin and therefore the risks of allergic reactions are significantly low. Peg-180 is well-tolerated by most skin types, even sensitive skin. However, higher concentrations should be avoided. Additionally, patch tests are recommended prior to full application.

PEG-180 alternatives

PEG-180 technical profile

PropertyValues

Boiling Point

> 250°C

Melting Point

64°C - 66°C

pH

 5 - 7

Solubility

Highly soluble in water; insoluble in oil

Viscosity

High