Dimethicone …

Dimethicone/Divinyldimethicone/Silsesquioxane Crosspolymer is a synthetic silicone polymer—a crosslinked structure built from dimethicone (a common silicone oil) and divinyldimethicone, reinforced with silsesquioxane. It functions as both a conditioning agent and a formula stabiliser in skincare products.In formulation, it helps control viscosity, prevent caking in powders, and create a protective film on the skin surface. Because it's insoluble in water, it remains on the skin rather than absorbing into it, making it useful for textural refinement and barrier support.

This crosspolymer sits on the skin surface and does not penetrate into deeper layers. It works by forming a thin, continuous film that smooths the appearance of pores and fine texture, whilst also helping to seal in moisture by reducing water evaporation from the stratum corneum.In formulations, its crosslinked structure allows it to thicken liquids and prevent ingredients from separating, making it particularly useful in serums, mousses, and colour cosmetics where texture consistency matters.

This ingredient is used by formulators rather than consumers—it appears in finished products at low concentrations (typically below 1%). Look for it in serums, primers, colour-correcting creams, and powder formulations if you prefer silicone-based texturing. Use as directed on the product label; there is no separate dosing protocol.

Generally well-tolerated in cosmetic use; silicone polymers have a strong safety history. Those with silicone sensitivity or who prefer silicone-free skincare should check ingredient lists, as this polymer is not easily replaced by alternatives with identical sensory and stabilising properties.