---
type: threshold
id: methyl-acetylene-propyne-2
asset: workplace-exposure-limits
title: "Methyl acetylene; propyne — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side"
sources:
  - https://www.dir.ca.gov/title8/5155.html
source_quote: "74997 | | Methyl acetylene; propyne | 1,000 | 1,650"
generated: true
harvested: 2026-08-05
stale_after: 2027-08-05
substance: "Methyl acetylene; propyne"
pel_ppm: "1,000"
pel_mgm3: "1,650"
verified: true
---
**Substance:** Methyl acetylene; propyne

**PEL (ppm):** 1,000

**PEL (mg/m³):** 1,650

> 74997 | | Methyl acetylene; propyne | 1,000 | 1,650

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