---
type: threshold
id: propylene-oxide-1-2-epoxy-propane
asset: workplace-exposure-limits
title: "Propylene oxide; 1,2-epoxy-propane — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side"
sources:
  - https://www.dir.ca.gov/title8/5155.html
source_quote: "75569 | | Propylene oxide; 1,2-epoxy-propane | 2 | 4.75"
generated: true
harvested: 2026-08-05
stale_after: 2027-08-05
substance: "Propylene oxide; 1,2-epoxy-propane"
pel_ppm: "2"
pel_mgm3: "4.75"
verified: true
---
**Substance:** Propylene oxide; 1,2-epoxy-propane

**PEL (ppm):** 2

**PEL (mg/m³):** 4.75

> 75569 | | Propylene oxide; 1,2-epoxy-propane | 2 | 4.75

Source: <https://www.dir.ca.gov/title8/5155.html>