PEG-150 …

PEG-150/Stearyl Alcohol/SMDI Copolymer is a synthetic polymer created by combining polyethylene glycol (PEG), stearyl alcohol (a fatty alcohol derived from plant or animal sources), and SMDI (a chemical linker). This combination creates a large molecular structure designed to improve the physical properties of skincare products.In formulations, it primarily functions as a film former and viscosity controller. This means it helps create a lightweight, often invisible layer on the skin's surface and allows formulators to adjust the thickness and texture of creams, serums, and other products w…

The polymer works by forming a thin, continuous film across the skin's surface. This film is typically breathable and flexible, creating a polished texture without the occlusive heaviness of traditional emollients. The stearyl alcohol component contributes mild skin-conditioning properties, while the PEG and SMDI portions ensure the film is stable and uniform.Because it is a large polymer molecule, it sits primarily on the skin rather than penetrating deeply. This makes it particularly useful for formulations where a refined, non-greasy finish is desired, such as lightweight serums or gel-c…

This ingredient is best used as part of a complete skincare routine rather than on its own, since its primary role is supporting formulation texture and stability. Apply products containing this polymer to clean skin, following the specific instructions for your chosen formulation. If layering multiple products, start with lighter textures and build to heavier ones to avoid pilling. Because it is a film former, cleanse thoroughly in the evening to remove it and allow skin to breathe overnight.

PEG-150/Stearyl Alcohol/SMDI Copolymer is generally well-tolerated and is approved for use in cosmetics across major regulatory bodies. Sensitivities are uncommon, though those with known sensitivities to polyethylene glycol or stearyl alcohol should patch test first.