This rule was remanded by the U.S. Circuit Court of Appeals and the limits are not currently in force.
Potassium hydroxide is corrosive to tissues.
The health hazards of potassium hydroxide are similar to those of the other strong alkalies, such as sodium hydroxide. These substances gelatinize tissue on contact, causing deep, painful lesions. Although dose-response data are lacking for this substance, it is reasonable to expect potassium hydroxide to exhibit irritant properties similar to those of sodium hydroxide, a structurally related strong alkali.