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STEARETH-80.

Valuable CAS 9005-00-9 (Generic) / CLEANSING, SURFACTANT - CLEANSING

Steareth-80 is an ethoxylated stearyl alcohol derivative that functions as a highly effective surfactant in cosmetic formulations. It is instrumental in reducing surface tension, facilitating the stable mixing of oil and water.

Summary

Cleansing agent Emulsifying agent Solubilizing agent

Science

Mechanism of Action

As a highly ethoxylated surfactant, Steareth-80 primarily operates by significantly lowering the interfacial tension between disparate phases within a formulation. This property allows it to effectively act as an emulsifying agent, ensuring the stability of oil-in-water or water-in-oil emulsions. Furthermore, its solubilizing capabilities enable the integration of otherwise insoluble ingredients, while its cleansing action facilitates the removal of oils and dirt from the skin by enhancing their miscibility with water.

Research

Clinical Evidence

Insufficient-data confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Water
Optimal pH N/A
0 7 14

Stability

Steareth-80 is synthesized through the reaction of ethylene oxide with stearyl alcohol. Its high degree of ethoxylation, specifically 80 ethylene oxide (EO) units, contributes to its excellent water solubility and overall stability within formulations. This ingredient is known to combine effectively with other emulsifiers and thickeners to achieve desired product consistency and stability.

Synergies

  • Other emulsifiers
  • Thickeners

Safety

Safety Profile

CIR Status
Safe with restrictions
Sensitization risk Moderate

The Cosmetic Ingredient Review (CIR) Expert Panel has concluded that Steareth ingredients, including Steareth-80, are safe when formulated to be non-irritating. There is a recognized potential for skin irritation if not properly formulated. As a byproduct of ethoxylation, small quantities of 1,4-dioxane may be present, though this can be controlled via purification steps. It is crucial to avoid using Steareth ingredients on compromised or damaged skin, as historical data on related PEG compounds indicated potential kidney effects in burn patients. Steareth-80 adheres to general cosmetic provisions for market use in the European Union, while the FDA maintains concerns regarding unsafe levels of 1,4-dioxane in cosmetic products.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

Steareth-80 is a valuable surfactant, essential for stabilizing emulsions and solubilizing ingredients, but requires careful formulation to ensure non-irritancy and should be avoided on damaged skin.

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