---
type: threshold
id: phenylhydrazine
asset: workplace-exposure-limits
title: "Phenylhydrazine — 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: "Phenylhydrazine | 100-63-0 | 5 | 22 | X |"
generated: true
harvested: 2026-08-05
stale_after: 2027-08-05
substance: "Phenylhydrazine"
cas_number: "100-63-0"
pel_ppm: "5"
pel_mgm3: "22"
verified: true
---
**Substance:** Phenylhydrazine

**CAS No.:** 100-63-0

**PEL (ppm):** 5

**PEL (mg/m³):** 22

> Phenylhydrazine | 100-63-0 | 5 | 22 | X |

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