U.S. Code of Federal Regulations
Regulations most recently checked for updates: Aug 28, 2025
(a) Specific gravity at 25 °C. 0.890 to 0.910.
(b) Refractive index at 20 °C. 1.455 to 1.465.
(c) Esters as menthyl acetate. 5 percent minimum.
(d) Menthol (free and esters). 5 percent minimum.
