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BUTYL ACRYLATE/HYDROXYETHYL METHACRYLATE COPOLYMER.

Valuable CAS 30600-43-2 / FILM FORMING

A synthetic polymer that creates protective, flexible films on skin surfaces while enhancing product adherence and longevity. This multifunctional ingredient simultaneously reduces water loss, stabilizes formulations, and improves the staying power of active compounds.

film forming viscosity controlling emulsion stabilising opacifying

Science

Forms a continuous, cohesive film barrier that provides occlusive protection to minimize transepidermal water loss while increasing viscosity of aqueous phases to stabilize emulsions and enhance active ingredient retention


Research

High confidence
Effective range 25–30%
Optimal

25%

Key findings

  1. 01 HRIPT study with 47 subjects showed no irritation or sensitization at 25% concentration
  2. 02 Clinical testing at 30% solids confirmed non-irritant, non-sensitizer profile

Transparency

Not commonly dusted

Primarily used as a functional film-former rather than an active ingredient, making dusting less relevant for this polymer


The Formula

Solubility
Water
Optimal pH 6 – 8
0 7 14

Stability

Requires neutral to slightly alkaline pH for optimal solubility; precipitates in acidic conditions and typically supplied as 30% solids emulsion

Conflicts

  • Multivalent metal ions
  • Strongly acidic environments

Safety

CIR Status
Safe as used
Max tested
25%
Sensitization risk Low

CIR Expert Panel approved this and 125 related acrylates copolymers as safe when formulated to be non-irritating; higher concentrations permitted in nail products up to 98%


Your Skin

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

Our Assessment

Valuable

A well-tolerated, versatile polymer that enhances product performance through film-forming and stabilizing properties with strong safety data.


Related

Finding similar ingredients…


References