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Moumoujus

SD ALCOHOL 3-C.

Avoid / ASTRINGENT, SOLVENT, VISCOSITY CONTROLLING

SD Alcohol 3-C, primarily ethanol denatured with up to 5% isopropyl alcohol, functions as a versatile solvent to enhance product aesthetics and active ingredient delivery. While it offers temporary pore tightening and antimicrobial benefits, its use in higher concentrations risks compromising the skin's barrier, leading to dehydration and compensatory oil production.

Summary

antimicrobial/antibacterial solvent viscosity controlling astringent antifoaming masking

Science

Mechanism of Action

Primarily serving as an efficient solvent, SD Alcohol 3-C enables the dissolution of diverse ingredients, contributing to cosmetically elegant and rapidly absorbing product textures. It also acts as an astringent by influencing keratin bonds, temporarily contracting pores and firming the skin. Additionally, it provides antimicrobial properties and can significantly enhance the penetration of other active compounds into the epidermis. However, at elevated concentrations, this alcohol can disrupt the skin's natural lipid barrier, causing moisture loss and potentially triggering increased sebum production as the skin attempts to rebalance.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Both
Optimal pH N/A
0 7 14

Stability

SD Alcohol 3-C demonstrates stability under normal handling conditions. Given its high flammability, it must be rigorously protected from heat, sparks, open flames, hot surfaces, direct sunlight, and extreme temperatures.

Conflicts

  • strong oxidizing agents
  • acids
  • alkali metals
  • ammonia
  • hydrazine
  • peroxides
  • sodium
  • acid anhydrides
  • calcium hypochlorite
  • chromyl chloride
  • nitrosyl perchlorate
  • bromine pentafluoride
  • perchloric acid
  • silver nitrate
  • mercuric nitrate
  • potassium-tert-butoxide
  • magnesium perchlorate
  • acid chlorides
  • platinum
  • uranium hexafluoride
  • silver oxide
  • iodine heptafluoride
  • acetyl bromide
  • disulfuryl difluoride
  • tetrachlorosilane + water
  • acetyl chloride
  • permanganic acid
  • ruthenium (VIII) oxide
  • uranyl perchlorate
  • potassium dioxide

Safety

Safety Profile

CIR Status
Safe as used
Sensitization risk Unknown

The Cosmetic Ingredient Review (CIR) Expert Panel has concluded that SD Alcohols, including those denatured with isopropyl alcohol at low concentrations (up to 5% for SD Alcohol 3-C), are considered safe for cosmetic use. However, it is important to note that higher concentrations of denatured alcohol are known to cause significant drying, irritation, and weakening of the skin's natural barrier. No specific maximum use concentration for cosmetics has been mandated.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Avoid

While SD Alcohol 3-C offers formulation benefits as a solvent and penetration enhancer, its high irritancy and potential to compromise the skin barrier at higher concentrations make it generally unsuitable for precision skincare formulations.

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