SD Alcohol 39
What is SD Alcohol 39?
SD Alcohol 39 is a denatured form of ethanol (ethyl alcohol) used in skincare products as a solvent, astringent, and antiseptic agent. It is specially denatured with tert-butyl alcohol and denatonium benzoate to make it unfit for consumption, allowing its use in cosmetics without beverage alcohol taxes. This quick-evaporating alcohol helps dissolve other ingredients, aids in product penetration, and provides a drying effect on the skin.
Roles in Formulation
This ingredient serves the following purposes in cosmetic formulations:
Solvent
Dissolves and carries other ingredients, helping control viscosity, evaporation rate, and delivery of actives in both water- and oil-based systems.
Antimicrobial agent
Helps limit growth of bacteria and other microbes on skin or in the formula; may be used for product protection, odor control, or targeted antimicrobial effects.
Denaturant
Makes ethanol undrinkable (for regulatory/tax purposes) and can influence dry-down and sensory feel in alcohol-based sprays, toners, and fragrances.
Preservative
Protects the product from microbial contamination during storage and use, helping maintain safety, stability, and shelf life.