---
type: threshold
id: tetrahydrofuran
asset: workplace-exposure-limits
title: "Tetrahydrofuran — 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: "Tetrahydrofuran | 109-99-9 | 200 | 590 | - |"
generated: true
harvested: 2026-08-05
stale_after: 2027-08-05
substance: "Tetrahydrofuran"
cas_number: "109-99-9"
pel_ppm: "200"
pel_mgm3: "590"
verified: true
---
**Substance:** Tetrahydrofuran

**CAS No.:** 109-99-9

**PEL (ppm):** 200

**PEL (mg/m³):** 590

> Tetrahydrofuran | 109-99-9 | 200 | 590 | - |

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