---
type: threshold
id: perchloromethyl-mercaptan
asset: workplace-exposure-limits
title: "Perchloromethyl mercaptan — 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: "Perchloromethyl mercaptan | 594-42-3 | 0.1 | 0.8 | - |"
generated: true
harvested: 2026-08-05
stale_after: 2027-08-05
substance: "Perchloromethyl mercaptan"
cas_number: "594-42-3"
pel_ppm: "0.1"
pel_mgm3: "0.8"
verified: true
---
**Substance:** Perchloromethyl mercaptan

**CAS No.:** 594-42-3

**PEL (ppm):** 0.1

**PEL (mg/m³):** 0.8

> Perchloromethyl mercaptan | 594-42-3 | 0.1 | 0.8 | - |

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