All alcohol begins with fermentation. What separates one type from another is what gets fermented, how it's distilled, and what happens afterward. Whether the end product is a bottle of vodka, a pharmaceutical disinfectant, or a barrel-aged whisky, the foundational chemistry is the same: sugar, yeast, and heat.
At Sasma BV, we supply a wide range of alcohols across food and beverage, as well as non-food categories. Understanding how each is made is the starting point for sourcing the right product for your portfolio.
Column Distillation: Neutral Alcohols & Vodka
The most efficient and widely used production method in the alcohol industry is continuous column distillation. It’s the starting point for everything from spirits to specialty-grade ethanol.
It begins with selecting the right raw material, such as wheat, rye, corn, barley, or sugarcane. Depending on the feedstock, the first processing step is either mashing, in which grains are broken down to release fermentable sugars. Or juice extraction for fruit- and cane-based materials.
Once the sugars are accessible, fermentation begins. Yeast is introduced as a catalyst, converting those sugars into alcohol and carbon dioxide. The result is a low-strength fermented liquid, rich in congeners (flavor and aroma compounds). It is then followed by distillation.
In a continuous column still, this liquid is fed in at the top while steam rises from below. As the two meet, alcohol vapor separates from water and impurities. Unlike batch distillation, the process runs without stopping, making it highly efficient. The repeated separation across multiple stages strips away virtually all congeners, producing a spirit of around 96% ABV. It creates a clean, colorless, and flavorless neutral alcohol.
Vodka is the most recognizable extension of this process. The neutral spirit is diluted with water to around 40% ABV and then filtered to refine the texture. While column distillation removes most character, the feedstock still has a subtle influence on drinking strength. A wheat-based vodka tends toward smoothness; potato vodka often carries more body. The difference is marginal, but present.
Pot Still & Maturation: Whisky, Rum, Brandy
Where column distillation prioritizes efficiency and purity, pot still distillation does the opposite. Distilling in batches rather than continuously means the liquid isn't stripped to the same degree. More congeners are retained.
Maturation in oak then adds a further layer: color, structure, and flavor compounds that the raw distillate doesn't have.
Whisky begins with a malted grain base. Barley is most common, though corn, rye, and wheat all feature depending on the style. After mashing and fermentation, the liquid is distilled using pot stills, column stills, or a combination of both. The new-make spirit then goes into oak casks. Regional regulations define each style.
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Scotch requires at least three years in oak in Scotland.
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Bourbon must be made from at least 51% corn and aged in new, charred American oak.
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Irish whiskey is typically triple-distilled for a lighter profile.
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Japanese and Rye expressions each carry their own legal frameworks and flavor signatures.
Rum starts with either molasses or fresh cane juice. Unlike Whisky, fermentation style varies significantly. Some producers use wild yeast and long fermentation times to develop heavy, ester-rich distillates; others use controlled fermentation for a cleaner result. Still choice follows the same logic as whisky: pot stills for weight and complexity, column stills for a lighter base.
Maturation determines much of the final character. Light rums are typically unaged or briefly rested; dark and aged expressions spend years in cask, developing the depth associated.
Brandy and fruit distillates use fermented wine or fruit as the base. Pot distillation preserves the aromatic character of the source material in a way that column distillation cannot, and that flavor retention is the reason the method is used.
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Cognac and Armagnac are the most recognized sub-categories, each tied to specific French regions, grape varieties, and aging requirements.
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Calvados, from Normandy, follows the same principle, using fermented apple and pear.
Outside these appellations, fruit distillates vary widely in style, but the principle holds. Careful distillation and maturation protect and develop what the fruit brings.
Botanical Redistillation: Gin
Gin starts with a neutral spirit produced through column distillation. To make gin, the neutral spirit is redistilled in the presence of botanicals. These can be introduced through a botanical basket suspended above the liquid in the still. The rising vapor passes through and picks up aromatic compounds, or through direct infusion, where the botanicals steep in the spirit.
Juniper is the defining botanical by regulation. Without it, a spirit cannot legally be called gin. Beyond juniper, producers blend in coriander seed, citrus peel, angelica root, cardamom, orris root, and a range of others to build their house style.
The London Dry method is the most traditional and restrictive approach. No flavorings or sweeteners can be added after distillation, and the final product must meet strict ABV requirements. It remains the benchmark against which most gins are measured.
Roasting & Fermentation: Agave Spirits
Most spirit categories begin with fermentation. Agave spirits follow a different process.
It begins with harvesting the piña, the dense starchy core of the agave plant, which can take anywhere from six to thirty years to reach maturity. The piña is then roasted to convert its complex carbohydrates into fermentable sugars. This is where styles diverge most sharply. Industrial ovens produce cleaner, more consistent results; traditional stone-lined pit roasting imparts a deep, smoky character. The method chosen here sets the flavor direction for everything that follows.
After roasting, the piña is crushed and the juice extracted. The liquid is then fermented with wild or ambient yeast, which adds additional complexity, before being distilled.
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Blue agave spirit, made from oven-roasted Blue Weber agave in a defined Mexican region, is largely unsmoked and cleaner in profile.
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Smoked agave spirit, produced across a broader range of agave species and regions and more often pit-roasted, carries the pronounced smokiness the category is known for.
The agave variety, roasting method, and fermentation approach combine to make this one of the most distinctive spirit categories in the world.
Purification & Grade Classification: Ethanol
The base production of specialty ethanol follows the same production as neutral alcohol. Raw materials are fermented, followed by continuous column distillation.
What changes is the purity, the compliance standard, and the post-distillation required for each application. For businesses sourcing at scale, getting the grade right is as important as getting the volume right. The wrong specification can mean failed audits, rejected batches, or regulatory non-compliance.
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Pharmaceutical-grade ethanol is produced to pharmacopoeia standards — the British Pharmacopoeia (BP), European Pharmacopoeia (EP), United States Pharmacopeia (USP), or Japanese Pharmacopoeia (JP), depending on the destination market. Manufacturing must take place under GMP conditions, with full documentation and traceability at every stage. It is supplied in multiple concentrations: 70% ABV for disinfectants and antiseptics, 96% for formulation and processing, and 99.9% anhydrous where near-complete absence of water is required.
- Cosmetics-grade ethanol targets ultra-low impurity thresholds, with particular attention to residual compounds that could affect skin safety or product stability. Organic certification is a common requirement, and anhydrous variants are used in formulations where water content must be tightly controlled.
- Electronic-grade ethanol is defined by trace metal content and post-evaporation residue specifications. It is used in precision cleaning where even microscopic contamination can cause failure.
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Industrial and denatured alcohol is ethanol to which chemical denaturants have been added, making it unfit for consumption and therefore exempt from beverage excise duty. This makes it the most cost-effective option for high-volume use in fuels, solvents, paints, coatings, and adhesives.
Sasma BV supplies all of these grades with full traceability, certified documentation, and logistics tailored to each application.
Get Started with Sasma BV
If you're sourcing bulk alcohol and want to discuss the right grade and specification for your application, get in touch with a member of our team at Sasma BV.
