Science
Mechanism of Action
BIS-PEG-8 PEG-8 DIMETHICONE acts as a surfactant and emulsifier due to its water-soluble PEG and silicone-soluble dimethicone groups. On the skin, it forms a protective barrier to lock in moisture, preventing dehydration and smoothing the appearance of fine lines. In hair, it coats strands to improve manageability, reduce frizz, and enhance gloss.
Research
Clinical Evidence
Medium confidence5%
Key findings
- 01 At a 5% concentration, PEG-8 dimethicone demonstrated enhanced stability, taking 89 days for 20% hydrolysis at pH 5 and 165 days at pH 8, significantly longer than at 1% concentration (45 days at pH 5, 86 days at pH 8). Stability consistently increases with higher concentrations.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
For optimal stability, formulations should maintain a pH between 5.5 and 8.5. Stability improves with decreasing water solubility, increasing molecular weight (>10,000), and higher concentrations. It should be added to the water phase, and if hot processed, after cooling below 50°C (122°F).
Safety
Safety Profile
The CIR Expert Panel concluded that PEG-8 dimethicone is safe for cosmetic use, specifically up to 5.6% concentration. It is permitted in EWG VERIFIED products.
Your Skin
Skin Compatibility
Our Assessment
Verdict
BIS-PEG-8 PEG-8 DIMETHICONE is a valuable ingredient offering broad benefits for skin and hair conditioning, supported by good stability within its optimal pH range and a strong safety profile.
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