---
type: threshold
id: methyl-mercaptan
asset: workplace-exposure-limits
title: "Methyl 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: "Methyl mercaptan | 74-93-1 | (C)10 | (C)20 | - |"
generated: true
harvested: 2026-08-05
stale_after: 2027-08-05
substance: "Methyl mercaptan"
cas_number: "74-93-1"
pel_ppm: "(C)10"
pel_mgm3: "(C)20"
verified: true
---
**Substance:** Methyl mercaptan

**CAS No.:** 74-93-1

**PEL (ppm):** (C)10

**PEL (mg/m³):** (C)20

> Methyl mercaptan | 74-93-1 | (C)10 | (C)20 | - |

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