Ethanol Ethyl alcohol SDA formula 1. CAS RN 64-17-5. Formula Weight: 46.07. Anhydrous Denatured (SDA Formula 1) 90-92% ethanol. Water: 0.1%. SDA Formula 1 is composed of the following ratio of reagents: 100:5 of 190 proof Ethanol and Methanol. Packaged