Polyisobutene
Synthetic polymer emollient with a film finish. Functional formulation ingredient with no standalone activity on the skin.
Supporting ingredient
It gives a product its texture, stability or shelf life. It has no claimed effect on the skin, so an efficacy tier does not apply. What is known about its safety is below
Tolerability and safety
- Irritation potential
- Low
- Allergen risk
- Low
- Pregnancy
- Safe
About this ingredient
Polyisobutene (and hydrogenated polyisobutene) is a synthetic isobutylene polymer. A technical emollient with film finish, replacing mineral oils and natural waxes in colour cosmetics. Where applied. Lipsticks, lip glosses, tints, mascaras, brow products (5-30%). Provides water resistance and pigment durability. Safety. CIR confirmed polyisobutene and hydrogenated form safety. Does not penetrate epidermis, no systemic absorption. Pregnancy and lactation – safe.
Frequently asked questions
Is Polyisobutene safe during pregnancy?
Polyisobutene is considered safe during pregnancy at typical cosmetic concentrations. Systemic absorption through the skin is minimal.
What is Polyisobutene and what does it do in cosmetics?
Synthetic polymer emollient with a film finish.
What's the INCI name for Polyisobutene?
The INCI name is Polyisobutene.
See Polyisobutene in a product composition right on the store page
The Evigrade extension adds an evidence panel to iHerb, Sephora, Druni and 12 more stores. This ingredient and every other one in the product show evidence-tier, allergen risk and pregnancy/lactation flags at a glance.
Similar role in the formula
Other functional ingredients
Polylactic Acid, Polymethyl Methacrylate, Polymethylsilsesquioxane, Polypropylsilsesquioxane, Sorbitan Laurate, C12-13 Aleth-9, Disodium Cocoyl Glutamate, MIPA-Laureth Sulfate
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