Science
Mechanism of Action
This ingredient functions acutely as a surfactant, decreasing liquid surface tension to facilitate the blend of disparate oil and water phases, thereby enhancing cleansing processes by solubilizing oils and impurities for efficient rinsing. As an emulsifier, it plays a critical role in stabilizing emulsions, maintaining the homogeneous dispersion of immiscible components. Furthermore, PEG-250 DISTEARATE contributes significantly to product rheology, serving as a robust thickener, particularly in systems containing amphoteric surfactants and soaps, achieving desired consistencies. Beyond these primary roles, broader properties of polyethylene glycols suggest a capacity to attract and retain dermal moisture via hydrogen bonding and to diminish transepidermal water loss through surface barrier formation.
Research
Clinical Evidence
Low confidence5%
Transparency
Dusting Analysis
The Formula
Formulation
Stability
A 10% dispersion typically presents a pH of 7.26. This ingredient is susceptible to hydrolysis in hot alkaline solutions and will saponify when exposed to strong acids or bases. For optimal integration, PEG-250 DISTEARATE should be heated to 60°C with other surfactants to achieve complete melting, then incorporated into the water phase at 35°C before adding the oil phase and pH adjustment.
Conflicts
- hot alkaline solutions (leads to hydrolysis)
- strong acids (leads to saponification)
- strong bases (leads to saponification)
- salicylates (can cause discoloration or precipitation)
- phenolic substances (can cause discoloration or precipitation)
- iodine salts (can cause discoloration or precipitation)
- salts of bismuth (can cause discoloration or precipitation)
- salts of silver (can cause discoloration or precipitation)
- tannins (can cause discoloration or precipitation)
- some preservatives (can form complexes)
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has concluded that PEG distearates, including PEG-250 DISTEARATE, are safe for use in cosmetics when formulated to be non-irritating. A maximum concentration of 5.0% is generally considered safe. However, caution is advised against application to compromised skin, as lower molecular weight PEGs may be readily absorbed, with sensitization and nephrotoxicity documented in burn patients treated with PEG-based creams. Manufacturers must ensure impurities such as ethylene oxide and 1,4-dioxane are maintained at acceptably low levels to minimize potential genotoxic effects. The US Food and Drug Administration (FDA) recognizes its safety for general or specific, limited uses in food.
Your Skin
Skin Compatibility
Our Assessment
Verdict
PEG-250 DISTEARATE is a valuable formulating agent for its robust emulsifying, thickening, and surfactant properties, deemed safe for use on intact skin within established concentration limits.
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