California Established Prop 65 Safe Harbor Level for N-Hexane

On March 21, 2019, California’s Office of Environmental Health Hazard Assessment (OEHHA) has established Proposition 65 maximum allowable dose levels (MADLs) for oral and inhalation exposures to n-hexane. The regulation begins on July 1, 2019.

The MADLs for n-hexane are set at:

• 28000 micrograms per day for oral exposure
• 20000 micrograms per day for inhalation exposure

An MADL represents a safe harbor exposure limit below which a company is not required to provide a Prop 65 warning.

N-hexane is a degreaser, solvent component, and low-temperature thermometer filling. It was listed as a reproductive toxicant under Prop 65 in December 2017.