Polypropylene

Polypropylene is a synthetic polymer—a long-chain plastic material derived from petroleum. In skincare formulations, it functions as a viscosity controller, meaning it alters how thick or thin a product feels and flows. It helps formulators achieve the desired texture without relying solely on oils or traditional thickening agents.It appears in a small proportion of skincare products (roughly 0.2%), typically in formulations where texture refinement is a priority. As a polymer, it sits on the skin surface rather than being absorbed, contributing to the sensory experience of a product.

Polypropylene works by increasing the viscosity (thickness) of a formula, which changes how the product behaves when applied. A thicker formula spreads differently and feels different on the skin compared to a thin serum or lotion. By adjusting polymer content, formulators can fine-tune whether a product feels lightweight or more substantial.Because polypropylene is a large molecular structure, it remains largely on the skin surface and does not penetrate significantly into deeper layers. Its role is primarily functional—supporting the texture and application properties of the finished prod…

Polypropylene is an inactive ingredient used by formulators, not something you need to apply differently. If you are using a product that contains it, simply follow the product's standard instructions. There are no special application guidelines specific to this ingredient.

Polypropylene is generally considered safe in cosmetic formulations and is approved for use in skincare products in most major regulatory regions. It is not known to be irritating or sensitising for most people.