---
type: threshold
id: naphthalene-diisocyanate-ndi
asset: workplace-exposure-limits
title: "Naphthalene diisocyanate; NDI — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side"
sources:
  - https://www.dir.ca.gov/title8/5155.html
source_quote: "25551284 | | Naphthalene diisocyanate; NDI | 0.01 | 0.085 | C"
generated: true
harvested: 2026-08-05
stale_after: 2027-08-05
substance: "Naphthalene diisocyanate; NDI"
pel_ppm: "0.01"
pel_mgm3: "0.085"
ceiling: "C"
verified: true
---
**Substance:** Naphthalene diisocyanate; NDI

**PEL (ppm):** 0.01

**PEL (mg/m³):** 0.085

**Ceiling:** C

> 25551284 | | Naphthalene diisocyanate; NDI | 0.01 | 0.085 | C

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