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Moumoujus

CETEARETH-17.

Valuable CAS 68439-49-6 / SURFACTANT - CLEANSING, SURFACTANT - EMULSIFYING

A versatile non-ionic polyether of cetearyl alcohol that serves as a cornerstone for stabilizing complex skincare textures. It acts as a sophisticated bridge between oil and water phases, ensuring that active ingredients remain uniformly dispersed throughout the shelf life of a product.

Summary

Emulsifying agent Surfactant Cleansing agent Dispersing agent

Science

Mechanism of Action

Ceteareth-17 operates through its amphiphilic molecular structure, featuring a lipophilic fatty alcohol tail and a hydrophilic polyoxyethylene chain of 17 units. By lowering interfacial tension, it facilitates the formation of stable oil-in-water (O/W) emulsions and acts as a protective colloid, preventing ingredient separation and ensuring a smooth, consistent application on the skin.

Research

Clinical Evidence

High confidence
Effective range 1–5%
Optimal

1.5%

Key findings

  1. 01 Comparative patch testing on structural analogs showed minimal irritation potential at concentrations up to 10%.
  2. 02 Repeat-insult patch tests at 1.35% confirmed the ingredient is a non-sensitizer for the general population.
  3. 03 In vitro assessments on human lymphocytes demonstrated a lack of cytotoxic effects even at concentrations significantly higher than typical cosmetic usage (up to 50%).

Transparency

Dusting Analysis

Not commonly dusted
Min. effective
0.5%
Red flag below
0.1%

As a functional emulsifier rather than a bio-active hero, Ceteareth-17 is rarely 'dusted.' It is typically included at percentages necessary for structural integrity (often 1-5%); inclusion below 0.5% may suggest it is being used merely for secondary dispersion rather than primary emulsification.

The Formula

Formulation

Solubility
Both
Optimal pH 3 – 9
0 7 14

Stability

Exhibits excellent stability across a wide pH range. Being non-ionic, it maintains integrity in the presence of electrolytes and is compatible with both anionic and cationic surfactants.

Synergies

  • Cetearyl Alcohol
  • Mineral Oil
  • UV Filters

Conflicts

  • Strongly alkaline environments
  • Strong oxidizing agents

Safety

Safety Profile

CIR Status
Safe as used
Max tested
5%
Pregnancy
Safe
Sensitization risk Low

While safe for general topical use, it should be avoided on severely damaged or broken skin (such as deep burns) to prevent potential systemic absorption of PEG compounds.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
No Sensitive
Irritancy Moderate
Comedogenicity Moderate

Our Assessment

Verdict

Valuable

A reliable and stable emulsifier essential for creating high-performance, uniform skincare textures, though its moderate comedogenicity profile requires careful consideration for acne-prone skin.

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