Chemical of the Week – Ethyl Alcohol

Ethyl alcohol is so woven into everyday life (beverages, hand sanitizers, cleaners, fuels) that responders can forget they’re dealing with a highly flammable liquid that’s caused countless fires, explosions, and industrial incidents throughout history. This colorless liquid with its characteristic odor is generally low in acute toxicity (you’d need significant exposure for serious poisoning beyond intoxication), but its real hazards are fire-related: it has a low flashpoint, burns with a nearly invisible flame in daylight, mixes completely with water (which complicates some firefighting approaches), and its vapors form explosive mixtures with air across a wide range of concentrations. The danger is complacency bred from familiarity: a warehouse full of hand sanitizer represents thousands of gallons of flammable liquid, distillery incidents can release alcohol vapors that ignite catastrophically, and even medical or laboratory settings can have sufficient quantities to fuel serious fires. Whether you’re responding to a distillery fire, industrial ethanol spill, tanker accident, or facility leak, remember that ethanol burns hot, the flames can be hard to see in bright conditions (leading to burn injuries from invisible fire), and large spills create vapor clouds that’ll ignite from distant ignition sources. The ubiquity of ethyl alcohol in consumer products, industry, and healthcare means you’re more likely to encounter a significant ethanol incident than many exotic chemicals, so don’t let its familiarity dull your response: treat it like the Class IB flammable liquid it is, use alcohol-resistant foam if you’re fighting fires, monitor atmosphere aggressively, and remember that “drinkable” doesn’t mean “safe in bulk.”

Have fun and let us know how you did in researching the hazards.