Hydroxybutyric Acid/Hydroxypentanoic Acid Copolymer ●
TL;DR. This ingredient is primarily used as a biodegradable film-former, texture modifier, and gentle physical exfoliating particle in rinse-off and some leave-on products. It can also help improve slip and sensory feel without acting as a surfactant or preservative.
What does Hydroxybutyric Acid/Hydroxypentanoic Acid Copolymer do in a cosmetic formula?
This ingredient is primarily used as a biodegradable film-former, texture modifier, and gentle physical exfoliating particle in rinse-off and some leave-on products. It can also help improve slip and sensory feel without acting as a surfactant or preservative.
Is Hydroxybutyric Acid/Hydroxypentanoic Acid Copolymer clean?
From a clean-beauty perspective, this material is generally viewed as low-irritation and unproblematic when properly sized and purified. It is not a common fragrance allergen or preservative sensitizer, and its main scrutiny is documentation of biodegradability and residual processing aids.
Is Hydroxybutyric Acid/Hydroxypentanoic Acid Copolymer sustainable?
This material is commonly made through microbial fermentation using renewable carbon sources, rather than conventional petrochemical plastic production. It is designed to biodegrade under appropriate environmental conditions, which gives it a stronger sustainability profile than persistent synthetic exfoliating particles or film-formers.
Is Hydroxybutyric Acid/Hydroxypentanoic Acid Copolymer COSMOS-approved?
It can be permitted under COSMOS-natural when the feedstocks, fermentation, extraction, and processing aids meet standard requirements, with supplier documentation determining final certification status. Its renewable sourcing and biodegradability fit Green Chemistry principles well, although it is still a processed polymeric material rather than a minimally processed botanical ingredient.
How does Hydroxybutyric Acid/Hydroxypentanoic Acid Copolymer work chemically?
The molecule is an aliphatic microbial polyester built from two short-chain hydroxy-acid repeat units, which makes it water-insoluble but biodegradable through ester-bond cleavage and microbial metabolism. It is typically used as dispersed solid particles or a film-forming phase, and formulators control particle size, suspension stability, and compatibility with emulsifiers or thickeners more than pH-driven activity.
Last updated 2026-08-26