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PEG/PPG-50/40 COPOLYMER.

Valuable CAS - / CLEANSING, SOLVENT, SURFACTANT - CLEANSING

PEG/PPG-50/40 Copolymer is a sophisticated synthetic polymer engineered to optimize the texture and feel of skincare formulations. It primarily functions as a rheology modifier, effectively increasing product viscosity while imparting a desirable smooth, silky sensation to the skin during and after application.

Summary

Rheology Modifier Thickening Agent Skin Conditioning Agent Surfactant Emulsifying Agent

Science

Mechanism of Action

This copolymer acts as a rheology modifier, contributing to the thickening of cosmetic compositions. Its structure, featuring both polyethylene glycol (PEG) and polypropylene glycol (PPG) segments, influences its hydrophilic and hydrophobic properties, which can also enable it to function as a surfactant, skin conditioning agent, or emulsifying agent, potentially supporting micelle formation.

Research

Clinical Evidence

Medium confidence
Effective range 0.1–3%
Optimal

0.1%

Key findings

  1. 01 Helps thicken skincare compositions and provides a smooth, silky feeling during and after application when used between 0.2% and 1.6%.
  2. 02 Effectively thickens moisturizers (creams or lotions) and contributes to a smooth, silky feel at concentrations from 0.2% to 3%.
  3. 03 Used in serums for thickening and to achieve a smooth, silky feel, typically between 0.1% and 1.5%.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Water
Optimal pH N/A
0 7 14

Safety

Safety Profile

CIR Status
Safe with restrictions
Max tested
3%
Sensitization risk Low

The CIR Expert Panel has concluded that alkyl PEG/PPG ethers, including this copolymer, are safe for use in cosmetics when formulated to be non-irritating. The inclusion of PPG components does not introduce additional safety concerns. Due to their larger molecular size, these compounds are considered unlikely to significantly penetrate the skin. The comprehensive CIR report for the ingredient family addresses general concerns regarding potential residual impurities (e.g., ethylene oxide, propylene oxide, 1,4-dioxane) and effects on skin penetration.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Unknown
Comedogenicity Unknown

Our Assessment

Verdict

Valuable

PEG/PPG-50/40 Copolymer is a valuable ingredient, primarily enhancing product texture and delivering a smooth skin feel, with a favorable safety profile when used within recommended concentrations.

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References

Sources