What is the difference between fuel alcohol and completely denatured alcohol formula number 20 (CDA20)?
Fuel alcohol and CDA 20 are both products that are authorized only for fuel use, but they are different in several key ways. The primary distinction between fuel alcohol and CDA 20 is that fuel alcohol is produced on AFP premises and CDA 20 is produced on DSP premises. A second significant difference is that fuel alcohol is produced under the formula prescribed in 27 CFR 19.746. Section 19.746 allows for the use of 2 gallons or more of authorized materials per 100 gallons of distilled spirits of any proof.
The formula for CDA 20 is set forth in 27 CFR 21.24. Section 21.24 requires that exactly 2 gallons of authorized material be added to every 100 gallons of distilled spirits of not less than 195 proof.
A third distinction between fuel alcohol and CDA 20 is the list of authorized materials for each. See AFP7 for a complete list of the approved fuel alcohol materials.
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