Mesityl oxide; 4-methyl-3-pentene-2-one

For Mesityl oxide; 4-methyl-3-pentene-2-one, pel (ppm) is 15; pel (mg/m³) is 60; stel (ppm) is 25; stel (mg/m³) is 100, verified against its source on 2026-08-05.

Substance: Mesityl oxide; 4-methyl-3-pentene-2-one
PEL (ppm): 15
PEL (mg/m³): 60
STEL (ppm): 25
STEL (mg/m³): 100

Sourcedir.ca.gov

Verified2026-08-05

Review by2027-08-05

DatasetUS workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side

What the source says

141797 | | Mesityl oxide; 4-methyl-3-pentene-2-one | 15 | 60 | | 25 | 100

— dir.ca.gov, retrieved 2026-08-05

Source

dir.ca.govhttps://www.dir.ca.gov/title8/5155.html

Last verified against source: 2026-08-05. Scheduled for re-check by: 2027-08-05. This page as Markdown · OKF concept · full dataset as JSON.