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PEG-8 PEG-4 DIMETHICONE.

Valuable / HAIR CONDITIONING, SURFACTANT - CLEANSING, SURFACTANT - EMULSIFYING

PEG-8 PEG-4 DIMETHICONE is a water-soluble silicone polymer that acts as a multifaceted conditioning agent, effectively enhancing skin hydration and refining product texture. It forms a protective barrier to minimize transepidermal water loss while imparting a desirable slip and reducing tackiness in formulations.

Summary

Emollient Humectant Skin-conditioning agent Emulsifier Texture enhancer

Science

Mechanism of Action

This water-soluble silicone polymer functions primarily as an emollient, humectant, and skin conditioning agent. It creates a breathable, protective film on the skin's surface, which actively locks in moisture and significantly reduces transepidermal water loss, leading to improved hydration. Additionally, its emulsifying properties facilitate the harmonious blending of aqueous and oil phases, thereby enhancing overall formula stability, providing a smooth slip, and mitigating any sticky residue. It also contributes to a refined skin feel, potentially smoothing the appearance of fine lines and offering a matte finish in certain cosmetic applications.

Research

Clinical Evidence

High confidence
Effective range 0.024–5.6%
Optimal

3%

Key findings

  1. 01 Clinical assessments by the Cosmetic Ingredient Review (CIR) have affirmed the safety of PEG-8 Dimethicone for cosmetic use within a concentration spectrum of 0.024% to 5.6%.
  2. 02 Typical formulation practices incorporate this ingredient at levels between 1% and 5% to achieve optimal functional benefits.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Water
Optimal pH 4.5 – 5.5
0 7 14

Stability

For optimal stability, PEG-8 PEG-4 DIMETHICONE should be incorporated into the water phase of formulations and not subjected to temperatures exceeding 50°C (125°F). In emulsion systems, it is best added once the temperature has cooled to 50°C (125°F), with maximum stability observed in formulations adjusted to a pH between 4.5 and 5.5.

Safety

Safety Profile

CIR Status
Safe as used
Max tested
5.6%
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel has deemed PEG-8 Dimethicone safe for use in cosmetics at concentrations up to 5.6%. It is generally considered non-toxic and non-comedogenic, with a low irritancy profile. However, some finished products containing this ingredient may carry a California Proposition 65 warning due to the potential presence of trace manufacturing byproducts, specifically ethylene oxide (<1 ppm) and 1,4-dioxane (<10 ppm), which are classified as carcinogens.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

PEG-8 PEG-4 DIMETHICONE is a valuable, well-tolerated ingredient that significantly enhances skin hydration, refines product texture, and exhibits broad compatibility across all skin types.

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