What Is Alcohol Denat. Sd Alcohol 27-B?
Alcohol Denat. Sd Alcohol 27-B is a form of ethyl alcohol that has been denatured, meaning it has additives that make it unfit for drinking. In this case the denaturants are lavender oil and medicinal soft soap, sometimes called green soap. Ethyl alcohol itself is typically produced by fermenting sugars from crops such as corn, sugarcane or grains, then distilling the liquid to obtain a high concentration of ethanol. During denaturation regulators require specific additives; under the US code 27 CFR 21, formula 27-B calls for the measured inclusion of lavender oil and soft soap, giving the finished alcohol a characteristic scent and slight color.
Denatured alcohol has been part of cosmetic manufacturing since the early twentieth century because it offers the performance of pure ethanol without the tax burden applied to potable spirits. The 27-B variation became popular with perfumers and skin care formulators who appreciated the naturally pleasant aroma of lavender oil and the gentle surfactant quality of soft soap.
After fermentation and distillation, the raw ethanol is mixed with specified amounts of lavender essential oil and a solution of potassium-based green soap. The blend is filtered and tested to confirm it meets legal and purity requirements, then supplied to cosmetic labs in drums or bulk tanks.
You will most often find Alcohol Denat. Sd Alcohol 27-B in products that need quick dry-down or a light feel, such as facial toners, fragrance mists, setting sprays, peel-off masks, lightweight serums, hair styling sprays and spot treatment gels. It is less common in rich creams or leave-on moisturizers because those formulas aim to minimize evaporation.
Alcohol Denat. Sd Alcohol 27-B’s Cosmetic Benefits/Uses
Its role in cosmetics is tied directly to one key function.
Solvent: Alcohol Denat. Sd Alcohol 27-B efficiently dissolves both water-soluble and many oil-soluble ingredients, allowing actives, fragrances and polymers to mix evenly. Because ethanol evaporates quickly after application, it helps formulas feel weightless and accelerates drying time, giving products like sprays and toners a fresh non-sticky finish.
Who Can Use Alcohol Denat. Sd Alcohol 27-B
Products containing Alcohol Denat. Sd Alcohol 27-B tend to suit normal, combination and oily skin because the quick-evaporating base gives a light feel that helps reduce surface oil. Those with dry, very sensitive or compromised skin may find the alcohol content too stripping since it can pull moisture from the outer layer and disturb a weakened barrier.
The ingredient itself is produced from plant fermentation, and the required denaturants are lavender essential oil and medicinal soft soap made from potassium salts of fatty acids. When the soap is sourced from vegetable oils the finished material is typically free from animal derivatives, making it acceptable for most vegans and vegetarians. As formulations vary, strict vegans may still wish to confirm the origin of the soap portion with the brand.
Topical use during pregnancy or while breastfeeding is generally regarded as low risk because ethanol evaporates rapidly and is not absorbed in meaningful amounts. Lavender oil is present at a trace level specified by regulation. This is not medical advice, and anyone who is pregnant or nursing should show the full ingredient list of any product they plan to use to their healthcare provider first.
Alcohol Denat. Sd Alcohol 27-B is not known to increase photosensitivity. Still, because it is often paired with active ingredients that could make skin sun-reactive, daily sunscreen is a smart habit.
Potential Side Effects/Adverse Reactions
Responses to Alcohol Denat. Sd Alcohol 27-B vary by individual. The points below outline potential side effects that could occur, though most people will not notice problems when the ingredient is used at customary cosmetic levels.
- Dryness or tightness: Rapid evaporation can pull water from the surface leaving skin feeling dehydrated
- Stinging or burning: Freshly exfoliated or broken skin may feel a quick sting when alcohol contacts it
- Redness or irritation: Those with reactive or sensitized skin can experience temporary flush or itch
- Exacerbation of eczema or rosacea: High alcohol content may worsen existing inflammatory conditions
- Contact dermatitis or allergy: Rare sensitivity to lavender oil or soap components can trigger rashes or bumps
- Increased transepidermal water loss: Frequent use in high concentrations might weaken the lipid barrier over time
- Eye irritation: Sprays that accidentally reach the eyes can cause watering or discomfort
- Flammability hazard: The ingredient is highly flammable until it has fully dried on skin or hair
If you notice any persistent discomfort or adverse change in your skin stop using the product and consult a qualified healthcare professional.
Comedogenic Rating
Rating: 0 / 5
Alcohol Denat. Sd Alcohol 27-B flashes off almost as soon as it hits the skin, leaving no residue that could sit inside pores or mix with sebum. Because it is a volatile solvent with a low molecular weight and contains no fatty components, it is considered non-comedogenic.
People who are prone to acne or breakouts generally tolerate this ingredient well, though formulas that combine it with heavier emollients could still clog pores.
One extra point to note is that frequent use of high-alcohol products can dry the surface, which may prompt some skins to produce more oil. This rebound oiliness is a response to dehydration rather than direct pore clogging.
Summary
Alcohol Denat. Sd Alcohol 27-B acts primarily as a solvent, dissolving both water-based and many oil-based ingredients so they disperse evenly. Its rapid evaporation also creates a light, quick-dry finish that enhances sprays, toners and fragrances.
While ethyl alcohol variants are common in cosmetics, the 27-B version is less widespread and tends to show up in niche fragrance mists and professional skin care where the lavender scent is a plus.
Overall safety is good when used as directed. Most people experience no issues, though overuse can lead to dryness or irritation on sensitive skin. As with any new product it is wise to do a small patch test first to make sure your skin agrees with the full formula.