Polyisoprene ●
TL;DR. This ingredient is primarily used as a flexible film-former, binder, and adhesive component, especially where stretch, tack, or water-resistant wear is needed. It helps a formula form an elastic coating rather than adding moisture or cleansing action.
What does Polyisoprene do in a cosmetic formula?
This ingredient is primarily used as a flexible film-former, binder, and adhesive component, especially where stretch, tack, or water-resistant wear is needed. It helps a formula form an elastic coating rather than adding moisture or cleansing action.
Is Polyisoprene clean?
From a clean-beauty perspective, this ingredient often faces scrutiny as a synthetic film-forming polymer, especially under standards that screen for persistent polymeric materials. Skin irritation is not usually the central issue, but residual monomers, processing additives, and adhesive co-formulants can matter in sensitive-use areas.
Is Polyisoprene sustainable?
This material is commonly made from fossil-derived feedstocks, though bio-based routes exist in more limited supply chains. It is not readily biodegradable and can persist as flexible polymer fragments or films after use.
Is Polyisoprene COSMOS-approved?
It is generally not permitted under COSMOS-natural or COSMOS-organic because it is a synthetic hydrocarbon polymer rather than an approved natural, nature-derived, or mineral material. Its Green Chemistry profile is limited by nonrenewable sourcing and poor biodegradability, despite functional efficiency at low use levels.
How does Polyisoprene work chemically?
The molecule is an unsaturated C5 hydrocarbon polymer with flexible chains and residual carbon-carbon double bonds that give it elastomeric behavior. It is stable across normal cosmetic pH ranges, but the double bonds can oxidize over time, so stabilizers and compatible film-formers are often used in adhesive or long-wear systems.
Last updated 2026-05-15