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PEG/PPG-17/18 DIMETHICONE.

Valuable / SURFACTANT - EMULSIFYING

A highly versatile silicone polymer engineered to stabilize complex formulations as a primary emulsifier. It simultaneously enhances product texture, lubricates the skin, and forms a breathable, protective barrier to optimize moisture retention.

Summary

Emulsifying agent Skin lubricant Moisture retention agent Protective barrier former Texture enhancer Spreadability improver Cleansing agent Wetting agent

Science

Mechanism of Action

PEG/PPG-17/18 Dimethicone functions as an effective emulsifier by reducing interfacial tension, thereby enabling the stable co-existence of immiscible liquids like oils and water in a single formulation. Upon application, it forms a lightweight, non-comedogenic film on the skin's surface. This film provides lubrication, resulting in a smooth and supple skin feel, while also actively minimizing transepidermal water loss. Additionally, it offers a degree of protection against external environmental factors and significantly improves the spreadability and sensory appeal of cosmetic products. The ingredient can also serve auxiliary roles as a cleansing and wetting agent.

Research

Clinical Evidence

Medium confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

There is no available data to suggest that PEG/PPG-17/18 Dimethicone is commonly 'dusted' or associated with adverse perceptions.

The Formula

Formulation

Solubility
Water
Optimal pH N/A
0 7 14

Stability

As an alkoxy polysiloxane containing a PEG moiety, this ingredient exhibits hydrophilic characteristics, rendering it soluble in water and various alcohols. Its water solubility specifically increases in proportion to the number of alkoxy groups present. It is generally compatible with anionic surfactants, and its inclusion in formulations is known to significantly improve overall emulsion stability.

Synergies

  • Anionic surfactants: Enhances compatibility and formulation stability.
  • Hair fixative resins: Acts as a modifier to improve hair hold, increase softness and flexibility, and reduce tackiness.

Safety

Safety Profile

CIR Status
Safe as used
Max tested
14%
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel has concluded that 'Dimethicone Copolyol,' an overarching classification that includes PEG/PPG Dimethicones, is safe for use in cosmetic applications, a decision reaffirmed in 2005. While a subsequent 2014 CIR report addressing a broader group of polyoxyalkylene siloxane copolymers (including PEG/PPG-17/18 Dimethicone) indicated 'insufficient data' for certain *specific* ingredients within that larger category to complete a comprehensive assessment, PEG/PPG-17/18 Dimethicone itself has been reported in cosmetic use at concentrations up to 14% in perfumes. Additionally, the FDA has recognized it as safe for general or specific, limited use in food.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Verdict

Valuable

PEG/PPG-17/18 Dimethicone is a valuable, multi-functional silicone polymer that effectively stabilizes complex formulations while concurrently providing desirable skin benefits such as improved texture, enhanced moisture retention, and a non-irritating, non-comedogenic finish.

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