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SD ALCOHOL 30.

Avoid / ASTRINGENT, SOLVENT, VISCOSITY CONTROLLING

SD Alcohol 30 is a denatured alcohol primarily utilized in cosmetics for its excellent solvent capabilities and rapid evaporation, contributing to lightweight product textures. While it offers antimicrobial properties and enhances the absorption of other active ingredients, its potential to dehydrate the skin and compromise the natural barrier requires careful consideration.

Summary

Solvent Astringent Antimicrobial/Antibacterial Penetration Enhancer Preservative Creates cosmetically elegant, light formulas Quick-drying agent Viscosity decreasing agent Antifoaming agent Carrier agent

Science

Mechanism of Action

SD Alcohol 30 functions as a highly effective solvent, ensuring active ingredients are uniformly dispersed within formulations. It acts as a penetration enhancer, modifying skin permeability to facilitate deeper absorption of other beneficial substances. Its inherent antimicrobial and antiseptic properties help inhibit bacterial growth, contributing to product preservation and clearer skin. Additionally, it exhibits astringent qualities, which can temporarily minimize pore appearance and control excess oil, and its rapid evaporation imparts a quick-drying, non-greasy, matte finish.

Research

Clinical Evidence

High confidence
Effective range 15–70%
Optimal

N/A

Key findings

  1. 01 Antimicrobial efficacy has been observed at concentrations ranging from 15% (effective) to 70% (more assured), effectively reducing microbial load on the skin surface.
  2. 02 Specific denatured alcohol formulations (SD Alcohol 40-B) at 12% in a spray and 29% in a gel demonstrated no photoallergy, dermal sensitization, or phototoxic responses in human subjects, and were non-irritating in rabbit tests.
  3. 03 Repeated daily application of 70% ethanol for 14 days showed no statistically significant difference in redness compared to water, suggesting acute tolerance in certain controlled contexts.

Transparency

Dusting Analysis

Not commonly dusted

The provided research data does not indicate that SD Alcohol 30 is subject to 'dusting' or similar degradation issues.

The Formula

Formulation

Solubility
Both
Optimal pH N/A
0 7 14

Stability

SD Alcohol 30 acts as an effective preservative by inhibiting microbial growth, thereby enhancing the stability and extending the shelf life of cosmetic formulations.

Synergies

  • Enhances the penetration and efficacy of other active ingredients.

Conflicts

  • Formulations for skin with a compromised barrier or conditions like eczema, rosacea, or psoriasis, as it can aggravate these conditions.
  • Formulations primarily aiming for hydration or barrier repair without sufficient counterbalancing moisturizing ingredients.
  • High concentrations in general, as this increases drying and irritation risk.
  • Denaturants such as Quassin, Brucine, or Brucine Sulfate, for which the CIR Expert Panel has insufficient safety data.
  • Methanol, if used as a denaturant, due to potential dermal absorption concerns.

Safety

Safety Profile

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

The CIR Expert Panel deems specific types of denatured alcohol, including SD Alcohol 30 (when denatured with t-Butyl Alcohol, Diethyl Phthalate, or Methyl Alcohol), safe for cosmetic use up to 12% concentration. However, safety data is insufficient for denatured alcohols containing denaturants like Quassin, Brucine, or Brucine Sulfate. While absorption of ethanol through the skin is generally minimal and does not typically reach dangerous systemic levels in normal cosmetic use, some denaturants, particularly methanol, may pose a risk through dermal absorption.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Avoid

While SD Alcohol 30 provides useful formulation benefits and antimicrobial action, its high irritancy and potential to dehydrate and compromise the skin barrier generally outweigh its benefits for long-term skin health, particularly for sensitive or dry skin types.

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