Staff Answer
May 29, 2026 - 02:02 PM
SDA 40B 200 proof is ethanol denatured under federal Formula 40B (27 CFR § 21.76) at 100% alcohol by volume. "200 proof" means 100% ABV, the highest purity ethanol you can buy. The "SDA 40B" designation tells you which denaturants are added: tert-butyl alcohol and denatonium benzoate. It's the industry-standard ethanol for fragrance, cosmetic, and topical OTC formulation.
