---
type: threshold
id: n-heptane
asset: workplace-exposure-limits
title: "n-Heptane — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side"
sources:
  - https://www.dir.ca.gov/title8/5155.html
source_quote: "142825 | | n-Heptane | 400 | 1,600 | | 500 | 2000"
generated: true
harvested: 2026-08-05
stale_after: 2027-08-05
substance: "n-Heptane"
pel_ppm: "400"
pel_mgm3: "1,600"
stel_ppm: "500"
stel_mgm3: "2000"
verified: true
---
**Substance:** n-Heptane

**PEL (ppm):** 400

**PEL (mg/m³):** 1,600

**STEL (ppm):** 500

**STEL (mg/m³):** 2000

> 142825 | | n-Heptane | 400 | 1,600 | | 500 | 2000

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