---
type: threshold
id: methylene-bis-4-cyclohexylisocyanate-hydrogenated-mdi
asset: workplace-exposure-limits
title: "Methylene bis(4-cyclohexylisocyanate); hydrogenated MDI — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side"
sources:
  - https://www.dir.ca.gov/title8/5155.html
source_quote: "5124301 | | Methylene bis(4-cyclohexylisocyanate); hydrogenated MDI | 0.005 | 0.054"
generated: true
harvested: 2026-08-05
stale_after: 2027-08-05
substance: "Methylene bis(4-cyclohexylisocyanate); hydrogenated MDI"
pel_ppm: "0.005"
pel_mgm3: "0.054"
verified: true
---
**Substance:** Methylene bis(4-cyclohexylisocyanate); hydrogenated MDI

**PEL (ppm):** 0.005

**PEL (mg/m³):** 0.054

> 5124301 | | Methylene bis(4-cyclohexylisocyanate); hydrogenated MDI | 0.005 | 0.054

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