Science
Mechanism of Action
This ingredient operates by creating a breathable, hydrophobic film on the stratum corneum, effectively reducing transepidermal water loss (TEWL) and maintaining skin moisture levels. Beyond its hydrating properties, Polydiethylsiloxane also contributes to improved product aesthetics, enhancing spreadability and providing a soft, silky skin feel.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Polydiethylsiloxane, as part of the broader polydimethylsiloxane class, exhibits excellent thermal stability, resisting degradation up to 150 °C indefinitely in air. It is also highly chemically inert, contributing to the robustness and longevity of formulations.
Safety
Safety Profile
While Polydiethylsiloxane itself has not undergone a specific CIR Expert Panel review, related silicone polymers such as dimethicone and polysilsesquioxanes have been evaluated and concluded as 'safe as used' in cosmetics. Furthermore, the FDA lists related polydimethylsiloxanes for food additive and contact applications, and they are broadly used in various medical devices, suggesting a generally favorable safety profile for this class of ingredients.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Polydiethylsiloxane is a valuable emollient, enhancing skin hydration and formulation aesthetics with a generally favorable safety profile based on its broader silicone class, despite limited ingredient-specific clinical data.
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