---
type: threshold
id: cyclopentadiene
asset: workplace-exposure-limits
title: "Cyclopentadiene — 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: "Cyclopentadiene | 542-92-7 | 75 | 200 | - |"
generated: true
harvested: 2026-08-05
stale_after: 2027-08-05
substance: "Cyclopentadiene"
cas_number: "542-92-7"
pel_ppm: "75"
pel_mgm3: "200"
verified: true
---
**Substance:** Cyclopentadiene

**CAS No.:** 542-92-7

**PEL (ppm):** 75

**PEL (mg/m³):** 200

> Cyclopentadiene | 542-92-7 | 75 | 200 | - |

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