Polyisobutene
Polyisobutene is a synthetic polymer used in many UK beauty products to give a smooth, non-greasy glide and help formulas stay put on the skin. You’ll often find it in lipsticks, mascaras, primers and long-wear foundations where it improves spreadability and creates a soft-focus finish. It is considered safe for cosmetic use and is a favourite of formulators for its versatile texture-enhancing properties.
How it works in skincare
In cosmetics and skincare, polyisobutene functions as a viscosity-increasing agent, film former and emollient. It creates a breathable, flexible film on the skin or lips that helps lock in moisture while giving products a luxurious, cushiony slip. This makes it particularly useful in colour cosmetics and lip products where long wear and comfortable application are desired, without leaving a heavy or sticky residue.
Key benefits
- Provides a smooth, silky glide during application
- Helps products adhere better for improved wear time
- Creates a soft-focus, blurring effect on the skin
- Enhances the spreadability of creams and lotions
- Gives a non-greasy, comfortable feel on lips and skin
- Improves the overall texture and elegance of formulas
Best for
dry skin, normal skin, sensitive skin, mature skin
Where it comes from
Polyisobutene is a fully synthetic ingredient produced through the polymerisation of isobutene, a hydrocarbon derived from petroleum. It is not obtained from plant, seed or mineral sources in its final cosmetic form.