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Moumoujus

SEC-BUTYL METHACRYLATE.

Avoid CAS 2998-18-7 / FILM FORMING

Sec-Butyl Methacrylate is a methacrylate ester monomer primarily recognized for its film-forming properties, predominantly utilized in nail enhancement applications. Its use in direct skincare formulations is highly restricted due to significant safety concerns regarding skin sensitization and irritation.

Summary

Film Forming

Science

Mechanism of Action

It functions by creating a polymeric film upon application to a surface, a property primarily leveraged in cosmetic formulations for nail products.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Oil
Optimal pH N/A
0 7 14

Stability

Sec-Butyl Methacrylate necessitates stabilization, typically with MEHQ, to prevent premature and uncontrolled polymerization. Storage must be in tightly sealed containers, refrigerated, and in a well-ventilated, explosion-proof environment due to its flammability. Vapor/air mixtures can become explosive above 50°C, requiring strict avoidance of heat and ignition sources. It exhibits low water solubility (approximately 425.9 mg/L at 25°C) and forms hydrophobic polymers that dissolve in hydrocarbons.

Conflicts

  • Oxidants
  • Heat
  • Ignition Sources

Safety

Safety Profile

CIR Status
Safe with restrictions
Sensitization risk High

The CIR Expert Panel deemed it safe within nail enhancement products, contingent on strict avoidance of skin contact due to its recognized sensitizing potential. This assessment, initially from 2005, was under reconsideration in 2021. The substance is formally classified to cause skin irritation (H315), serious eye irritation (H319), and potential respiratory irritation (H335), with repeated or prolonged contact leading to skin sensitization. While it holds FDA Food Contact Substance (FCS) approval (177.1010) for specific indirect food contact applications, this does not imply suitability for direct skincare use. No dedicated SCCS opinion was found.

Your Skin

Skin Compatibility

No Normal
No Dry
No Oily
No Sensitive
Irritancy High
Comedogenicity Unknown

Our Assessment

Verdict

Avoid

Given its established capacity for skin irritation and sensitization, Sec-Butyl Methacrylate is deemed unsuitable for direct application in precision skincare formulations.

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