27 CFR § 21.93
Acetaldehyde
April 24, 2020
(a) Aldehyde content (as acetaldehyde). Not less than 95.0 percent by weight.
(b) Color. Colorless.
(c) Odor. Characteristic pungent, fruity odor.
(d) Specific gravity at 15.56 °/15.56 °C. Not less than 0.7800.