Isopropyl vs. Ethyl Alcohol: Key Differences, Uses & Safety Guide
Isopropyl alcohol is a three-carbon synthetic solvent (C₃H₈O) made from propene; ethyl alcohol is the two-carbon alcohol (C₂H₅OH) in beer and wine. Both evaporate quickly and kill microbes, but only ethyl is safe for consumption.
Shoppers see “alcohol” on labels and grab the cheapest bottle. In reality, one sterilises wounds while the other flavours cocktails. Misreading the fine print can turn a home brew into poison or wreck a smartphone screen.
Key Differences
Isopropyl is harsher, toxic if swallowed, and leaves oily residue—great for degreasing electronics. Ethyl is food-grade, gentler on skin, and metabolised by the liver, yet flammable and subject to liquor taxes.
Which One Should You Choose?
Use isopropyl 70 % for circuit boards and stubborn adhesives. Reach for ethyl 70 % for hand sanitiser, herbal tinctures, or anything that might touch your mouth. Never swap them blindly.
Can I use vodka instead of rubbing alcohol to clean?
Vodka is only ~40 % ethyl alcohol; you’d need 70 % to disinfect, so it’s too weak and too pricey.
Is isopropyl alcohol safe on skin?
Short contact is fine, but repeated use dries and cracks skin; moisturise afterwards.