C9-11 Isoparaffin

C9-11 Isoparaffin is a synthetic hydrocarbon solvent derived from mineral oil. It belongs to a class of ingredients known as isoparaffins, which are refined petroleum-derived compounds used primarily in cosmetic formulations.In skincare products, it functions as a solvent—helping to dissolve and blend other ingredients—and as a viscosity controller, which adjusts the thickness and spreadability of creams, serums and lotions. It is colourless and odourless, making it a neutral carrier in formulations.

C9-11 Isoparaffin acts as an inert medium that allows water-based and oil-based ingredients to mix more effectively. As a solvent, it dissolves hydrophobic compounds that would otherwise be poorly dispersed in water. This ensures a homogeneous product with consistent texture and performance.Its viscosity-controlling properties allow formulators to adjust how thick or fluid a product feels on application, without relying solely on thickening agents. This contributes to the sensory experience and ease of application.

C9-11 Isoparaffin is not an active ingredient you apply intentionally; it functions as a formulation ingredient. Use products containing it as directed by the manufacturer. If you notice your skin becoming more congested or oily after using a product, consider whether the overall formulation suits your skin rather than isolating this single ingredient as the cause.

C9-11 Isoparaffin is generally recognised as safe for cosmetic use and is approved in most regions including the UK and EU. Those with very oily, acne-prone or fungal-acne-sensitive skin may wish to patch-test products containing it, though sensitivity to this ingredient specifically is uncommon.