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BUTYLENE/ETHYLENE COPOLYMER.

Valuable CAS 9019-29-8 / VISCOSITY CONTROLLING

A synthetic polyolefin copolymer that serves as a multifunctional texturizing agent and film-forming polymer in cosmetic formulations. This large-molecule ingredient creates protective barriers on skin while transforming product texture, particularly excelling in anhydrous systems where it can gel liquid oils into stable, viscous formulations.

viscosity controlling film forming

Science

Creates a hydrophobic protective film on the skin surface that reduces transepidermal water loss while simultaneously acting as a non-aqueous thickening agent. Its large molecular structure prevents dermal penetration, making it function purely at the surface level to enhance product slip, texture, and barrier properties.


Research

High confidence
Effective range 3–95%
Optimal

N/A

Key findings

  1. 01 Non-sensitizing and non-irritating in human patch tests when used in lip products at maximum concentrations
  2. 02 Zero sensitization or irritation responses in human dermal studies at full concentration

Transparency

Not commonly dusted

As a functional polymer used for viscosity control and film formation, this ingredient serves essential formulation purposes rather than marketing benefits, making dusting unlikely.


The Formula

Solubility
Oil
Optimal pH 3 – 10
0 7 14

Stability

Exceptionally stable across all cosmetic pH ranges and standard temperature conditions due to its chemically inert polyolefin structure

Conflicts

  • Strong oxidizing agents

Safety

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

FDA approved as indirect food additive under 21 CFR 177.1570. Large molecular weight prevents dermal absorption, rendering it biologically inert.


Your Skin

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

Our Assessment

Valuable

A versatile, well-tolerated polymer that enhances product texture and skin barrier function with excellent safety across all skin types.


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