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Moumoujus

BENZOYL ISOPROPANOL.

Questionable CAS 7473-98-5 / FILM FORMING

A technical photoinitiating agent utilized to transition liquid resins into solid, durable films via light-induced polymerization. It is a staple in professional-grade UV-curable nail systems and dental materials rather than traditional topical skincare.

Summary

Photoinitiator Film former Curing agent

Science

Mechanism of Action

Operating as a Norrish Type I photoinitiator, this molecule undergoes homolytic cleavage when exposed to UV radiation (230–350 nm). This reaction generates benzoyl and ketyl free radicals that rapidly initiate a chain-reaction polymerization of unsaturated monomers, such as acrylates, to create a rigid polymer network.

Research

Clinical Evidence

Medium confidence
Effective range 1–3%
Optimal

2%

Key findings

  1. 01 MDPI (2022) study on UV-curable nail gel polymerization kinetics
  2. 02 Scientific Reports (2023) analysis of hydrogel tensile strength and network density

Transparency

Dusting Analysis

Not commonly dusted
Min. effective
1%
Red flag below
0.5%

As a functional catalyst, using this ingredient below 1% in UV-curable products typically results in incomplete polymerization (tacky finishes). It is not a skincare active, so its presence in leave-on creams at any level is a red flag.

The Formula

Formulation

Solubility
Oil
Optimal pH N/A
0 7 14

Stability

Highly light-sensitive; exposure to sunlight or strong indoor lighting can trigger premature curing. Must be stabilized in opaque packaging and stored below 30°C.

Synergies

  • Acrylates
  • Methacrylates
  • UVA/LED Light sources

Conflicts

  • Strong oxidizing agents
  • Peroxides
  • Copper
  • Iron
  • Strong bases

Safety

Safety Profile

CIR Status
Not reviewed
Max tested
5%
Sensitization risk High

Classified as a Category 2 skin irritant by ECHA. Prolonged exposure is associated with a significant risk of allergic contact dermatitis and dermal sensitization.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Questionable

While essential for professional UV-curing applications in nail and dental care, its high irritation potential makes it unsuitable for leave-on skincare.

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