# Caprolactam vapor — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side

For Caprolactam vapor, pel (ppm) is 5; pel (mg/m³) is 20; stel (ppm) is 10; stel (mg/m³) is 40, verified against its source on 2026-08-05.

- **Substance:** Caprolactam vapor
- **PEL (ppm):** 5
- **PEL (mg/m³):** 20
- **STEL (ppm):** 10
- **STEL (mg/m³):** 40

## What the source says

> 105602 | | Caprolactam vapor | 5 | 20 | | 10 | 40

## Source

- https://www.dir.ca.gov/title8/5155.html

Last verified: 2026-08-05. Review by: 2027-08-05.
Part of [US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side](https://referencesource.org/workplace-exposure-limits/).