This grain-derived ethanol has been denatured with 5% methanol, also known as specially denatured alcohol (SDA) under formula 3A. Methanol is the most common denaturant at concentrations up to 10%. Denatured ethanol is sometimes called “methylated spirits.”At Lab Alley, we understand that high quality reagents are essential to the integrity of your laboratory and manufacturing projects. That’s why we believe you deserve to have full confidence in the quality of your reagents. Lab Alley provides high quality, reliable 200 proof specially denatured ethanol, ideal for your laboratory and manufacturing needs.200 proof denatured ethanol is in stock in all multiple sizes ranging from 500 ml to 270 gallons for quick shipping to you.