---
type: threshold
id: ketene-ethenone
asset: workplace-exposure-limits
title: "Ketene; ethenone — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side"
sources:
  - https://www.dir.ca.gov/title8/5155.html
source_quote: "463514 | | Ketene; ethenone | 0.5 | 0.9 | | 1.5 | 3"
generated: true
harvested: 2026-08-05
stale_after: 2027-08-05
substance: "Ketene; ethenone"
pel_ppm: "0.5"
pel_mgm3: "0.9"
stel_ppm: "1.5"
stel_mgm3: "3"
verified: true
---
**Substance:** Ketene; ethenone

**PEL (ppm):** 0.5

**PEL (mg/m³):** 0.9

**STEL (ppm):** 1.5

**STEL (mg/m³):** 3

> 463514 | | Ketene; ethenone | 0.5 | 0.9 | | 1.5 | 3

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