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

For Ethylidene norbornene, pel (ppm) is 5; pel (mg/m³) is 25; ceiling is C, verified against its source on 2026-08-05.

- **Substance:** Ethylidene norbornene
- **PEL (ppm):** 5
- **PEL (mg/m³):** 25
- **Ceiling:** C

## What the source says

> 16219753 | | Ethylidene norbornene | 5 | 25 | C

## 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/).