---
type: threshold
id: methyl-acetylene-propyne
asset: workplace-exposure-limits
title: "Methyl acetylene (Propyne) — 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: "Methyl acetylene (Propyne) | 74-99-7 | 1000 | 1650 | - |"
generated: true
harvested: 2026-08-05
stale_after: 2027-08-05
substance: "Methyl acetylene (Propyne)"
cas_number: "74-99-7"
pel_ppm: "1000"
pel_mgm3: "1650"
verified: true
---
**Substance:** Methyl acetylene (Propyne)

**CAS No.:** 74-99-7

**PEL (ppm):** 1000

**PEL (mg/m³):** 1650

> Methyl acetylene (Propyne) | 74-99-7 | 1000 | 1650 | - |

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