SD Alcohol 40

What is SD Alcohol 40?

SD Alcohol 40 is a specially denatured form of ethanol, the common ethyl alcohol, rendered undrinkable by adding agents like tert-butyl alcohol and denatonium benzoate. Derived from grain or synthetic fermentation, it belongs to volatile solvents widely used in cosmetic formulations such as toners, astringents, cleansers, and sprays. In products, it rapidly evaporates, delivering a cooling sensation while dissolving oils and water-soluble actives for uniform blending. As an astringent, it interacts with surface proteins to create a tightening sensation, minimizing the appearance of pores and excess shine. Its solvent properties facilitate ingredient penetration and control evaporation rates. Additionally, it modifies product thickness, ensuring smooth application and stability in emulsions or gels. This multifunctional alcohol enhances sensory attributes like quick-dry finishes in leave-on and rinse-off items.

Comedogenic Rating 0/5 Low risk of clogging pores
EWG Safety Rating 4 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 refined, matte appearance.

Dissolves ingredients effectively to improve product stability and active delivery.

Adjusts texture for better spreadability and user-friendly consistency.

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 shine control in toners.
Those with sensitive skin prone to irritation.
Individuals preferring fast-absorbing, lightweight formulas.
People with dry or compromised skin barriers.
Users of astringent products for a toned feel after cleansing.
Individuals experiencing stinging from alcohol-based products.

Safety Notes

  • May cause dryness or irritation, especially on sensitive or damaged skin.
  • Functions as a penetration enhancer, potentially increasing absorption of other formula components.

Frequently Asked Questions about SD Alcohol 40

What is SD Alcohol 40?

It is denatured ethanol used in cosmetics as a fast-evaporating solvent and skin tightener.

Is SD Alcohol 40 comedogenic?

It has a low comedogenic rating and does not typically clog pores.

Why is it unsuitable for sensitive skin?

Its drying and tightening effects can irritate or sting sensitive skin types.