---
type: threshold
id: butyl-mercaptan
asset: workplace-exposure-limits
title: "Butyl 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: "Butyl mercaptan | 109-79-5 | 10 | 35 | - |"
generated: true
harvested: 2026-08-05
stale_after: 2027-08-05
substance: "Butyl mercaptan"
cas_number: "109-79-5"
pel_ppm: "10"
pel_mgm3: "35"
verified: true
---
**Substance:** Butyl mercaptan

**CAS No.:** 109-79-5

**PEL (ppm):** 10

**PEL (mg/m³):** 35

> Butyl mercaptan | 109-79-5 | 10 | 35 | - |

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