# Naphthalene diisocyanate; NDI — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side

For Naphthalene diisocyanate; NDI, pel (ppm) is 0.01; pel (mg/m³) is 0.085; ceiling is C, verified against its source on 2026-08-05.

- **Substance:** Naphthalene diisocyanate; NDI
- **PEL (ppm):** 0.01
- **PEL (mg/m³):** 0.085
- **Ceiling:** C

## What the source says

> 25551284 | | Naphthalene diisocyanate; NDI | 0.01 | 0.085 | 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/).