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PEG-4 SORBITAN STEARATE.

Valuable CAS 9005-67-8 / SURFACTANT - EMULSIFYING

PEG-4 Sorbitan Stearate is a synthetic surfactant primarily utilized in cosmetic formulations as an emulsifying, cleansing, and solubilizing agent. Its unique structure facilitates the stable mixing of immiscible substances, contributing to consistent product textures and enhanced ingredient dispersion.

Summary

emulsifying cleansing solubilizing

Science

Mechanism of Action

This ingredient functions by acting as a bridge between oil and water phases, significantly reducing their surface tension. Its amphiphilic molecules, possessing both lipophilic (oil-loving) and hydrophilic (water-loving) components, allow for the creation of stable emulsions. This property also aids in dissolving other ingredients that are not readily soluble in a given solvent and helps to dislodge and remove oil-based dirt and impurities from skin and hair, allowing for easier rinsing.

Research

Clinical Evidence

Medium confidence
Effective range 0.1–25%
Optimal

N/A

Key findings

  1. 01 The Cosmetic Ingredient Review (CIR) Expert Panel concluded that PEG Sorbitan/Sorbitol Fatty Acid Esters, including PEG-4 Sorbitan Stearate, are safe for use in cosmetics at concentrations not exceeding 25%.
  2. 02 Extensive clinical studies on related Polysorbates indicated minimal potential for human skin irritation, sensitization, and phototoxicity on normal skin.
  3. 03 PEG-8 Stearate, a related compound, demonstrated low irritation potential with a Primary Irritation Index (PII) of 0.81/8.00 and was considered a non-sensitizer.
  4. 04 Products containing 2% to 4% of non-PEGylated sorbitan stearate have shown mild irritation in some research.

Transparency

Dusting Analysis

Not commonly dusted

Information regarding the dusting properties or thresholds for PEG-4 Sorbitan Stearate is not available in the provided research data.

The Formula

Formulation

Solubility
Both
Optimal pH N/A
0 7 14

Stability

No specific optimal pH range for the stability of PEG-4 Sorbitan Stearate was identified. Polyethylene glycols typically exhibit a broad range of viscosity and solubility properties, with water solubility and hygroscopicity generally decreasing as molar mass increases.

Safety

Safety Profile

CIR Status
Safe as used with restrictions
Max tested
25%
Sensitization risk Low

The CIR Expert Panel considers PEG-4 Sorbitan Stearate safe for cosmetic use up to a maximum concentration of 25%. It is specifically cautioned against use on damaged skin and is deemed safe when formulated to be non-irritating. Small, controllable amounts of 1,4-dioxane, a by-product of the ethoxylation process, may be present but can be minimized through purification.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

PEG-4 Sorbitan Stearate is a valuable surfactant and emulsifier, critical for achieving stable formulations, and is considered safe for use in cosmetics at concentrations up to 25% on intact skin.

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