SD Alcohol 39c

What is SD Alcohol 39c?

SD Alcohol 39-C consists of ethanol (ethyl alcohol) specially denatured with tert-butyl alcohol and denatonium benzoate to deter consumption, making it ideal for non-ingestible cosmetic products. It belongs to the alcohol solvent category, prevalent in toners, astringents, aftershaves, and some styling aids. In formulations, it functions by rapidly dissolving oils, fragrances, and actives, enabling even distribution and enhanced penetration while controlling evaporation speed for a dry finish. As an astringent, it temporarily constricts surface skin proteins, yielding a taut, refined texture. It also modulates viscosity, stabilizing emulsions and gels for smooth dispensing and consistent spreadability. This quick-drying property suits lightweight, matte products, aiding delivery in water- or alcohol-based systems without residue.

Comedogenic Rating 0/5 Low risk of clogging pores
EWG Safety Rating 3 View on EWG →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Astringent
Creates a temporary tightening and toning effect by contracting surface proteins, helping reduce the look of oiliness and refining feel on skin.
Solvent
Dissolves and carries other ingredients, helping control viscosity, evaporation rate, and delivery of actives in both water- and oil-based systems.
Viscosity controlling agent
Adjusts thickness to the desired level for stability and usability, improving dispensing, suspension, and texture across many formulation types.

Benefits

Temporarily tightens skin surface for a toned, less oily appearance.

Dissolves and transports other ingredients effectively for better formulation performance.

Adjusts product thickness to improve texture, stability, and ease of use.

Who It's For

A quick guide for who this ingredient may suit (and who should be cautious).

Who May Benefit Who Should Avoid
People with oily skin looking for mattifying and pore-refining effects.
Those with dry skin prone to increased dehydration.
Users of toners or astringents desiring quick-drying sensations.
People with sensitive skin that reacts to drying agents.
Individuals preferring lightweight formulas with enhanced active delivery.
Individuals with barrier-damaged skin seeking gentle hydration.

Safety Notes

  • Safe for topical cosmetic use at concentrations typical in products, as assessed by regulatory panels.
  • Potential for mild drying or irritation, especially with repeated exposure.

Frequently Asked Questions about SD Alcohol 39c

What is SD Alcohol 39-C made of?

It is ethanol denatured with tert-butyl alcohol and denatonium benzoate for safe cosmetic use.

Does SD Alcohol 39-C clog pores?

It has a comedogenic rating of 0, indicating low likelihood of pore blockage.

Is it suitable for daily use in toners?

Common in toners for its quick-dry astringent effect, but monitor for dryness on sensitive skin.