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ALCOHOL DENAT. SD ALCOHOL 30.

Avoid / SOLVENT

Alcohol Denat., specifically SD Alcohol 30, is a rapidly evaporating, multi-functional cosmetic ingredient highly valued for its potent solvent properties and antimicrobial action. While it significantly aids in achieving formula elegance and enhancing ingredient delivery, its inherent characteristics indicate a high irritancy potential, necessitating precise formulation and careful consideration for sensitive skin types.

Summary

antimicrobial solvent viscosity controlling astringent antifoaming masking

Science

Mechanism of Action

Operating primarily as a solvent, Alcohol Denat. efficiently dissolves a wide array of ingredients, including those with limited water or oil solubility. On the skin, it functions as an effective antimicrobial, contributing to hygiene and product preservation, and as an astringent, providing temporary pore tightening and a refreshing sensation. Its low molecular weight facilitates rapid evaporation, which can enhance the percutaneous absorption of other active compounds and contribute to a lightweight, fast-drying product texture. It also acts as an antifoaming, masking, and viscosity-controlling agent.

Research

Clinical Evidence

High confidence
Effective range 15–29%
Optimal

20%

Key findings

  1. 01 Effective antimicrobial activity has been observed in products formulated with 15% to 20% Alcohol Denat., with 20% being a more assured concentration for this effect.
  2. 02 Formulations containing 12% SD Alcohol 40-B were shown to be non-irritating to vaginal mucosa in rabbits and did not induce sensitization, photoallergy, or phototoxicity in human subjects.
  3. 03 A gel formulation with 29% SD Alcohol 40-B demonstrated no photoallergic, dermal sensitizing, or phototoxic responses in human participants.
  4. 04 Topical application to pig skin resulted in rapid evaporation, with approximately 50% of the applied alcohol disappearing within 10 seconds and less than 3% remaining on the surface.

Transparency

Dusting Analysis

Not commonly dusted

As a liquid solvent, Alcohol Denat. does not present a dusting concern.

The Formula

Formulation

Solubility
Both
Optimal pH N/A
0 7 14

Stability

Exhibits good stability under normal conditions, demonstrating resistance to decomposition even under high heat.

Synergies

  • Enhances the absorption of other ingredients due to its rapid evaporation.

Conflicts

  • Mixtures with concentrated hydrogen peroxide can form powerful explosives.
  • Reaction with hypochlorous acid can produce violently explosive alkyl hypochlorites.

Safety

Safety Profile

CIR Status
Safe as used
Max tested
12%
Sensitization risk Low

The CIR Expert Panel considers Alcohol Denat. and specially denatured (SD) alcohols, including SD Alcohol 30, safe for cosmetic use when denatured with specific approved agents. While concentrations up to 12% are generally deemed safe for direct cosmetic application on skin, higher levels (up to 60% in aftershaves for antimicrobial/astringent effects and up to 80% in perfumes for solvent properties) are acknowledged for specific product categories. The FDA has not adequately demonstrated the long-term safety or efficacy of ethanol in consumer antiseptic washes for daily use compared to soap and water.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Avoid

While effective as a multi-functional solvent and antimicrobial agent, its noted high irritancy profile suggests caution and potential avoidance for general skincare, especially for individuals with sensitive skin, despite being deemed safe for use at specific concentrations by regulatory bodies.

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