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BUTENE/PROPYLENE COPOLYMER.

Valuable CAS 29160-13-2 / FILM FORMING, VISCOSITY CONTROLLING

A high-molecular-weight hydrocarbon polymer that creates a flexible, protective film on skin's surface while enhancing product texture and longevity. This biologically inert ingredient excels at preventing moisture loss and improving spreadability without penetrating the skin barrier. Particularly valued in long-wear and waterproof formulations for its stability and non-reactive nature.

film former viscosity controlling slip modifier

Science

Forms a thin, continuous barrier that adheres to the skin surface, preventing trans-epidermal water loss while remaining on the stratum corneum without penetration due to its large molecular size and lack of reactive functional groups.


Research

High confidence
Effective range ≤95%
Optimal

N/A

Key findings

  1. 01 Human Repeat Insult Patch Tests showed no dermal irritation or sensitization reactions in human subjects

Transparency

Not commonly dusted

Not typically used as a dusting ingredient due to its primary function as a film-former and texture enhancer in color cosmetics and protective formulations


The Formula

Solubility
Oil
Optimal pH N/A
0 7 14

Stability

Exceptionally stable across wide temperature ranges with resistance to oxidation and heat degradation, making it ideal for stick formulations and harsh environmental conditions

Conflicts

  • Water-only phases (insoluble)

Safety

CIR Status
Safe as used
Max tested
95%
Sensitization risk Low

CIR Expert Panel concluded safety in current practices with maximum reported concentration of 95% in lipsticks, no inhalation risk or systemic toxicity concerns


Your Skin

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Valuable

A highly stable, non-irritating film-former that enhances product performance and longevity across all skin types with excellent safety profile.


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