SPF Scout · Ingredient

Polyisobutene

Binder (holds the formula together)Film forming (leaves a thin coating)Viscosity control (thickens or thins the formula)

CAS 9003-27-4

What this ingredient generally does

A thickening and binding agent that also forms a film. It adjusts how thick the product is, holds the mix together, and leaves a thin coating on the skin as it dries.

Reviewed before publication. This note describes function in a formulation, and nothing else.

Published formulations that list this ingredient

These are the formulations currently published in the SPF Scout catalog whose stored ingredient declaration includes this ingredient. It is not a list of every product on the market, and the order carries no meaning.

Checking this against your own list

You can select this ingredient in the SPF Scout app as one to flag. The app compares your selections against a product's stored declaration on your device; your list never reaches this website.

This comparison does not predict whether your skin will react.

Where this information comes from

Ingredient names, CAS numbers and recorded functions come from SPF Scout’s curated ingredient dictionary, grounded in CosIng, the European Commission’s Cosmetic Ingredient Database. Content © European Union, reused with acknowledgement.

Report a correction