SD Alcohol 38-B
What is SD Alcohol 38-B?
SD Alcohol 38-B is a denatured form of ethanol, specifically formulated with denaturants like tert-butyl alcohol and denatonium benzoate to make it unfit for consumption, commonly used in cosmetics as a solvent and astringent. It functions by dissolving other ingredients, aiding product penetration into the skin, and providing a quick-drying, mattifying effect in toners, cleansers, and serums. Derived from grain or other plant sources, it evaporates rapidly, leaving a cooling sensation 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.