---
type: threshold
id: propylene-oxide
asset: workplace-exposure-limits
title: "Propylene oxide — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side"
sources:
  - https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
source_quote: "Propylene oxide | 75-56-9 | 100 | 240 | - |"
generated: true
harvested: 2026-08-05
stale_after: 2027-08-05
substance: "Propylene oxide"
cas_number: "75-56-9"
pel_ppm: "100"
pel_mgm3: "240"
verified: true
---
**Substance:** Propylene oxide

**CAS No.:** 75-56-9

**PEL (ppm):** 100

**PEL (mg/m³):** 240

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

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