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Moumoujus

BUTYL POLYDIMETHYLSILOXYL ETHYLENE/PROPYLENE/VINYLNORBORNENE COPOLYMER.

Valuable CAS - / VISCOSITY CONTROLLING

A sophisticated silicone-modified copolymer engineered to enhance sunscreen performance and create durable, non-tacky films on skin. This high-molecular-weight ingredient combines EPDM polymer technology with silicone modifications to deliver superior water resistance and uniform distribution of UV filters.

Summary

Film forming Viscosity controlling SPF boosting Water resistance enhancer

Science

Mechanism of Action

Functions as an advanced film-forming agent that creates a flexible, hydrophobic barrier on the skin surface, improving the substantivity and uniform distribution of active ingredients while providing enhanced water resistance without tackiness

Research

Clinical Evidence

Medium confidence
Effective range 1–5%
Optimal

2.5%

Key findings

  1. 01 Functions as an SPF booster in sunscreen formulations, effectively increasing sun protection factor of both organic and mineral filters through improved film uniformity and skin substantivity

Transparency

Dusting Analysis

Not commonly dusted
Min. effective
0.5%
Red flag below
0.1%

As a specialized film-former with demonstrated efficacy at meaningful concentrations, dusting would eliminate its primary benefits

The Formula

Formulation

Solubility
Oil
Optimal pH 3 – 10
0 7 14

Stability

Exceptionally stable due to saturated EPDM backbone and silicone modifications, withstanding temperatures up to 80°C and resistant to hydrolysis

Synergies

  • UV filters
  • Water-resistant actives
  • Long-wear pigments

Conflicts

  • High concentrations of short-chain alcohols
  • Extremely hydrophilic aqueous gels without proper emulsification

Safety

Safety Profile

CIR Status
Not reviewed
Max tested
10%
Pregnancy
Safe
Sensitization risk Low

Listed in EU CosIng database and Chinese IECIC list; component monomers considered safe for topical application with working range of 0.1-5.0% for optimal performance

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

A technically sophisticated ingredient that delivers measurable SPF enhancement and superior film properties, particularly valuable in sun protection and long-wear formulations.

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