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PEG/PPG-20/20 DIMETHICONE.

Valuable CAS - / SURFACTANT - EMULSIFYING

PEG/PPG-20/20 Dimethicone is a sophisticated silicone-based copolymer, expertly engineered to blend hydrophilic and lipophilic properties. It functions primarily as an emollient and emulsifier, enhancing product texture, spreadability, and skin feel while improving moisture retention.

Summary

Emollient Emulsifying Surfactant Skin Conditioning Film Forming Texture Enhancer Slip Modifier Foam Stabilizer

Science

Mechanism of Action

This advanced copolymer works by forming a breathable, water-resistant film on the skin's surface, which contributes to improved moisture retention and a smooth, non-greasy finish. Its unique dual hydrophilic and lipophilic structure allows it to effectively stabilize both oil-in-water and water-in-oil emulsions, preventing 'soaping' and optimizing product texture and stability across a broad pH range. Additionally, it acts as a surfactant, aiding in foam stabilization and providing mild conditioning in cleansing formulations.

Research

Clinical Evidence

Medium confidence
Effective range N/A
Optimal

N/A

Key findings

  1. 01 Studies on Dimethicone Copolyol, a broader category encompassing PEG/PPG dimethicones, demonstrated no primary skin irritation at concentrations up to 40% in aqueous solution.
  2. 02 Undiluted Dimethicone Copolyol also showed no evidence of primary skin irritation or sensitization in human subjects (n=50).
  3. 03 Furthermore, a related compound, PEG/PPG-25/25 Dimethicone, was non-irritating to dermal tissue when applied at 100% concentration in rabbit studies.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Both
Optimal pH 4 – 8
0 7 14

Stability

This nonionic surfactant/emulsifier exhibits stability under recommended storage conditions and is adaptable for cold processing. Its dual nature allows for versatility in both oil-in-water and water-in-oil emulsion systems.

Conflicts

  • Oxidizers
  • Acids
  • Bases

Safety

Safety Profile

CIR Status
Safe as used
Sensitization risk Low

While the CIR Expert Panel deemed dimethicone copolyol (an umbrella term for this ingredient class) 'safe as used,' a 2014 'insufficient data announcement' specifically requested further information on molecular weight ranges, impurities (like ethylene oxide and 1,4-dioxane), and dermal penetration, irritation, and sensitization for smaller polyoxyalkylene siloxane copolymers, including PEG/PPG-20/20 Dimethicone. Manufacturers are therefore advised to ensure the use of high-purity raw materials with impurity levels maintained within acceptable limits, particularly given its ethoxylated nature. It is typically used at low levels, for example, 0.1% in wet wipe formulations.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

PEG/PPG-20/20 Dimethicone is a valuable multi-functional ingredient, prized for its ability to enhance skin feel, stabilize emulsions, and improve moisture retention with a low risk of irritation or comedogenicity, though manufacturers should ensure raw material purity.

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