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Moumoujus

ALCOHOL DENAT. SD ALCOHOL 40-C.

Avoid / SOLVENT

Alcohol Denat. SD Alcohol 40-C is a denatured ethanol widely utilized in cosmetic formulations for its solvent, astringent, and quick-drying properties. While it can enhance ingredient penetration and provide an oil-controlling finish, it carries a high risk of skin dehydration and barrier disruption. Moumoujus acknowledges its functional benefits but cautions against its use due to significant concerns for skin health.

Summary

Antimicrobial/antibacterial Solvent Viscosity controlling Astringent Antifoaming Masking

Science

Mechanism of Action

This ingredient acts primarily as a solvent, effectively dissolving various components and potentially improving their dermal delivery. It offers an astringent effect, leading to a temporary skin tightening sensation and assisting with oil regulation. Furthermore, it exhibits antimicrobial activity and functions as a viscosity reducer and antifoaming agent. Its rapid evaporation facilitates a lightweight, fast-drying product finish. However, its significant drawback is its capacity to strip the skin's natural lipid barrier, which can lead to dehydration and compromise skin integrity.

Research

Clinical Evidence

Medium confidence
Effective range N/A
Optimal

N/A

Key findings

  1. 01 Demonstrated minimal irritation in rabbits when denatured with Denatonium Benzoate.
  2. 02 Proved nonirritating for vaginal mucosal tissue in New Zealand white rabbits in a spray formulation (SD Alcohol 40-B).
  3. 03 Did not induce photoallergy, dermal sensitization, or phototoxic response in human subjects when SD Alcohol 40-B was denatured with Denatonium Benzoate.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Water
Optimal pH N/A
0 7 14

Conflicts

  • Strong oxidizing agents
  • Formulations intended for dry or sensitive skin
  • High concentrations in products for frequent use

Safety

Safety Profile

CIR Status
Safe with restrictions
Max tested
12%
Sensitization risk Low

The CIR Expert Panel concluded that Alcohol Denat. (including SD Alcohol 40-C) is safe for use in cosmetic products at concentrations between 0.05% and 12% when denatured with t-Butyl Alcohol, Denatonium Benzoate, Diethyl Phthalate, or Methyl Alcohol. Insufficient data exist for forms denatured with Quassin, Brucine, or Brucine Sulfate. The FDA's definition of 'alcohol' for cosmetics strictly refers to ethanol, not denatured alcohol.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Avoid

Despite its functional versatility as a solvent and astringent, Alcohol Denat. SD Alcohol 40-C is a questionable ingredient for precision skincare due to its high irritancy and comedogenicity, and its potential to severely compromise the skin barrier at higher or frequent use concentrations.

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