Ethanol Overview: Properties, Applications, Safety & Sourcing Guide
Ethanol, also known as ethyl alcohol, is a clear, colorless, volatile organic compound with the chemical formula C2H6O (CAS 64-17-5). It's the alcohol in beer, wine, and spirits, but that's a small slice of what it actually does: it disinfects hands and surfaces in hospitals, blends into nearly every gallon of gasoline sold in the US, and sits on lab shelves as one of the most frequently used solvents in research.
What makes ethanol simultaneously so useful and so dangerous is the same property doing double duty everywhere it shows up. The volatility that lets it evaporate cleanly off a countertop is also what creates fire hazards. The solvent action that extracts vanilla flavor is the same action that dissolves pharmaceutical compounds. Every application balances ethanol's usefulness against its extreme flammability, which dominates safety thinking regardless of the use case.
Properties of Ethanol
Chemistry determines capability. Ethanol's molecular structure creates the characteristics that make it valuable while demanding careful handling.
Key Facts About Ethanol
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Compound Name: Ethanol
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Synonyms: Ethyl alcohol, grain alcohol, absolute alcohol, cologne spirit, EtOH, spirits of wine, denatured alcohol (when additives present), UN 1170
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Chemical Formula: C2H6O (CH3CH2OH)
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CAS Number: 64-17-5
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Molar Mass: 46.07 g/mol
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Appearance: Clear, colorless liquid with a characteristic ethereal, vinous odor
Density. At 20°C, ethanol weighs approximately 0.789 g/cm3, lighter than water. Spilled onto water, it initially floats before mixing, which matters for emergency response since floating ethanol spreads fire across a water surface rather than sinking safely below it.
Thermal Properties. Ethanol boils at 78.37°C (173.1°F) and melts at -114.1°C (-173.5°F), staying liquid even in arctic conditions. The number that matters most for safety is the flash point: 13°C (55°F). Room temperature typically exceeds this, meaning ethanol constantly releases flammable vapor, and a spark too small to feel can ignite it.
Ethanol and water form an azeotrope at roughly 95.6% ethanol. At that ratio, both compounds evaporate together at the same rate, so simple distillation can't push purity any higher, reaching absolute (200 proof) ethanol requires molecular sieve dehydration or a similar specialized technique.
Solubility and pH. Ethanol mixes completely with water in any ratio and dissolves in most organic solvents, which is what makes it so flexible for formulation work. Pure ethanol sits near neutral at roughly pH 7.33 and won't corrode metal through pH attack, though impurities or additives can shift that.
Reactivity and Stability. Strong oxidizers like hydrogen peroxide or nitric acid react with ethanol exothermically, generating enough heat to ignite it, so the two should never be stored together. Ethanol vapor forms an explosive mixture with air between roughly 3.3% and 19% concentration, a wide range that demands real vigilance about vapor buildup in poorly ventilated spaces. It's also hygroscopic, pulling moisture from the air, so high-purity grades need resealing immediately after each use or the concentration drifts. One more detail worth knowing: ethanol burns with a pale blue flame that's barely visible in daylight, which is part of why ethanol fires catch people off guard.
Properly sealed and stored, ethanol itself is chemically stable indefinitely.
Ethanol is a widely used organic solvent and alcohol applied across food, beverage, pharmaceutical, cosmetic, laboratory, and industrial products. It supports extraction, sanitation, formulation, preservation, and chemical synthesis. Laboratories, manufacturers, and processors in the United States seeking high-purity ethanol can contact Lab Alley at 512-668-9918 to order the appropriate grade and concentration for specific operational needs.
Ethanol sold by Lab Alley is available in Food, Pharmaceutical, Cosmetic, Technical, and High-Purity Analytical Grades, with concentrations ranging from 190 proof to 200 proof and container sizes spanning from small laboratory bottles to 55-gallon drums.
Applications & Benefits
Ethanol's versatility stems from being simultaneously a good solvent, an antimicrobial agent, a clean-burning fuel, and a regulatory-approved compound for food and pharmaceutical contact.
Food & Beverage
Beer fermentation produces 4-6% ethanol, wine reaches 12-15%, and distilled spirits concentrate it to 40% and higher. Beyond beverages, high-proof ethanol extracts flavor compounds from vanilla beans, herbs, and botanicals that water can't touch, disperses food coloring, and provides antimicrobial preservation in certain specialty products.
Medical & Pharmaceutical
Surgical antiseptics use 70% ethanol for rapid antimicrobial action, and hand sanitizers at 60-70% ethanol serve the same purpose for routine use. Pharmaceutically, ethanol dissolves active ingredients that won't dissolve adequately in water alone, and manufacturing processes use it for tablet granulation and as a process solvent during synthesis.
Industrial
The single largest use is fuel: E10 (10% ethanol) is blended into nearly every US gas pump gallon, with E15 and E85 serving vehicles built for higher ethanol content. Beyond fuel, ethanol dissolves pigments and resins in paints and coatings, and dissolves oils and grease in cleaning products, evaporating cleanly without residue either way.
Laboratory & Research
Ethanol cleans glassware, dissolves samples, and precipitates DNA out of solution during nucleic acid extraction. In histology, tissue samples move through a graded ethanol series to dehydrate them before paraffin embedding.
Cosmetic & Personal Care
Perfumes and colognes dissolve fragrance oils in ethanol that evaporates after application, leaving scent behind. Hair spray, setting spray, aftershave, and toners use the same evaporation and antiseptic properties.
Denatured vs. Non-Denatured vs. Specially Denatured: Which One Do You Need?
This is the question that trips up more first-time buyers than any other ethanol spec, so it's worth answering directly in one place rather than across three separate posts.
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Type |
What It Is |
Typical Use |
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Non-denatured (undenatured) |
Pure ethanol with no additives; food, pharmaceutical, or lab grade |
Pharmaceutical manufacturing, food/flavor extraction, craft distilling, DNA/analytical work |
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Denatured |
Ethanol with additives (methanol, isopropanol, etc.) making it unfit to drink, avoiding beverage excise tax |
Industrial cleaning, coatings, fuel blending, general manufacturing where purity for consumption isn't needed |
|
Specially Denatured Alcohol (SDA) |
Denatured under specific TTB-approved formulas (SDA 3A, SDA 40-B, etc.) for defined commercial uses |
Cosmetics and perfume (SDA 40-B), specific industrial and lab applications matched to the formula's approved use |
The short version: if the end product will be ingested, applied to skin as a pharmaceutical, or needs the highest purity for lab work, non-denatured is the answer, and it carries the excise tax and age-restriction requirements that come with beverage-grade alcohol. If it's going into a cleaning product, coating, or industrial process, denatured or SDA avoids that tax burden, provided the specific denaturant doesn't interfere with the application. For the deeper technical picture on any of these, see the dedicated guides on Denatured Ethanol, Non-Denatured Ethanol, and Specially Denatured Alcohol (SDA).
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Safety Information
Ethanol's extreme flammability overshadows every other hazard it presents.
Health Hazards
That 13°C (55°F) flash point means standard room temperature releases flammable vapor continuously. NFPA Class IB and OSHA Category 2 flammable liquid classifications reflect that risk. Vapor inhalation causes eye and respiratory irritation, headaches, dizziness, and drowsiness resembling intoxication; repeated skin contact dries and irritates. Ethanol vapor is denser than air, so it sinks and can accumulate in basements or floor drains, where a distant ignition source can reach it.
Personal Protection
Safety goggles, nitrile gloves (better resistance than latex or vinyl), and a lab coat or chemical-resistant apron cover routine handling. Add respiratory protection with an organic vapor cartridge when ventilation can't keep vapor levels down.
Storage
Keep it in an approved flammable liquid storage cabinet, cool and well-ventilated, tightly sealed, away from oxidizers and strong acids. OSHA limits storage to 60 gallons per cabinet, three cabinets per fire area.
Emergency Response
Standard protein foam extinguishers fail instantly on alcohol fires; use alcohol-resistant foam, CO2, or dry chemical instead. For spills, eliminate ignition sources first, then absorb and ventilate. For skin or eye exposure, flush with water for at least 15 minutes and seek medical attention for persistent symptoms.
Regulatory Overview
Ethanol faces multiple regulatory frameworks depending on use. Understanding which rules apply prevents violations.
OSHA Classification
NFPA Class IB flammable liquid and OSHA Category 2 flammable liquid designations trigger workplace safety requirements, including approved storage cabinets, proper labeling, fire protection systems, and worker training. Permissible exposure limit sits at 1000 ppm time-weighted average (1900 mg/m³). Workplace air monitoring ensures vapor concentrations stay below this threshold.
DOT Classification
UN 1170 identifies ethanol for shipping purposes. Hazard Class 3 designates flammable liquids, requiring specific packaging, marking, labeling, and placarding. Packing Group II reflects moderate danger among flammable liquids.
Environmental Considerations
Biodegradability makes ethanol environmentally favorable compared to persistent solvents. Microorganisms readily metabolize ethanol, breaking it down to carbon dioxide and water. Low environmental persistence means ethanol doesn't bioaccumulate or contaminate groundwater long-term. Aquatic toxicity becomes significant only at high concentrations.
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Medicinal Oils Derived From Plants
You can order food-grade ethanol, extraction-grade ethanol, ACS-grade ethanol, FCC-grade ethanol, USP grade ethanol, HPLC-grade ethanol and kosher ethanol from Lab Alley. Perform ethanol (EtOH) extraction at ultra-low temperatures for the best yields.
Ethanol extraction is a cost-effective way to use ethanol as an industrial solvent to produce high-quality botanical extracts from large volumes of medicinal herbs or plants.
Ethanol Grades and Pack Sizes
Suppliers stock diverse ethanol grades and package sizes matching varied application needs.
Available Grades & Purities
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Absolute ethanol (200 proof) contains 99.5-100% ethyl alcohol with essentially zero water. Applications requiring anhydrous conditions, like certain pharmaceutical preparations or chemical synthesis, need absolute ethanol despite the higher cost.
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190 proof ethanol (95%) represents the azeotropic mixture obtainable through distillation. This concentration suits most applications at a lower cost than absolute grades, with the small water content tolerable for food extraction, general laboratory work, and many pharmaceutical uses.
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Denatured ethanol formulations add substances, making ethanol unfit for consumption, avoiding beverage taxes. SDA 3A contains methanol denaturant. SDA 3C uses isopropanol. Various other formulations serve specific industrial purposes, with permits required for purchasing and using SDA.
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Pharmaceutical grade (USP) meets United States Pharmacopeia purity standards for medical and pharmaceutical applications. Maximum impurities are limited to 0.5% by weight. Rigorous testing and extensive documentation support regulatory compliance.
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Food grade (FCC) conforms to Food Chemicals Codex specifications for food and beverage uses. GRAS certification confirms consumption safety. Using non-food-grade ingredients in food products violates regulations and creates health hazards.
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Industrial grade provides economical options for manufacturing, fuel blending, and cleaning where pharmaceutical or food purity isn't required. Slightly higher impurity levels (up to 1% by weight) don't affect most industrial applications. This grade meets ASTM and EPA requirements for fuel and industrial applications.
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Laboratory grades ranging from reagent to analytical purity serve research needing consistent quality with certificates of analysis documenting exact specifications.
Pack Sizes & Bulk Availability
Small containers (500ml, 1L, 4L) suit laboratories and low-volume users. Medium containers (5 gallons, 20L) serve regular users and small manufacturing operations. Bulk quantities (55 gallons, 270 gallons, tank trucks) accommodate high-volume industrial users, fuel distributors, and large manufacturers.
Common concentrations include 70% for disinfection applications, 95% for general use, and 99%+ for anhydrous applications.
Regulatory Requirements
Permit requirements apply to some ethanol grades. Beverage alcohol requires TTB permits for production and distribution. Specially denatured alcohol requires permits for purchase and use. Industrial use permits allow qualified facilities tax-free access to undenatured ethanol.
Excise tax applies to non-denatured ethanol at $13.50 per proof gallon unless exemptions apply. This substantial tax makes denatured alcohol economically attractive when denaturants don't interfere with applications. Age restrictions (21+) govern non-denatured ethanol purchases, preventing diversion to underage drinking.
