---
type: threshold
id: piperazine-dihydrochloride
asset: workplace-exposure-limits
title: "Piperazine dihydrochloride — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side"
sources:
  - https://www.dir.ca.gov/title8/5155.html
source_quote: "142643 | | Piperazine dihydrochloride | -- | 5"
generated: true
harvested: 2026-08-05
stale_after: 2027-08-05
substance: "Piperazine dihydrochloride"
pel_mgm3: "5"
verified: true
---
**Substance:** Piperazine dihydrochloride

**PEL (mg/m³):** 5

> 142643 | | Piperazine dihydrochloride | -- | 5

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