# Propylene oxide — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side

For Propylene oxide, cas no. is 75-56-9; pel (ppm) is 100; pel (mg/m³) is 240, verified against its source on 2026-08-05.

- **Substance:** Propylene oxide
- **CAS No.:** 75-56-9
- **PEL (ppm):** 100
- **PEL (mg/m³):** 240

## What the source says

> Propylene oxide | 75-56-9 | 100 | 240 | - |

## Source

- https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1

Last verified: 2026-08-05. Review by: 2027-08-05.
Part of [US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side](https://referencesource.org/workplace-exposure-limits/).