---
type: threshold
id: methylene-bis-phenylisocyanate-mdi-diphenylmethane-diisocyanate
asset: workplace-exposure-limits
title: "Methylene bis(phenylisocyanate); MDI; diphenylmethane diisocyanate — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side"
sources:
  - https://www.dir.ca.gov/title8/5155.html
source_quote: "101688 | | Methylene bis(phenylisocyanate); MDI; diphenylmethane diisocyanate | 0.005 | 0.051"
generated: true
harvested: 2026-08-05
stale_after: 2027-08-05
substance: "Methylene bis(phenylisocyanate); MDI; diphenylmethane diisocyanate"
pel_ppm: "0.005"
pel_mgm3: "0.051"
verified: true
---
**Substance:** Methylene bis(phenylisocyanate); MDI; diphenylmethane diisocyanate

**PEL (ppm):** 0.005

**PEL (mg/m³):** 0.051

> 101688 | | Methylene bis(phenylisocyanate); MDI; diphenylmethane diisocyanate | 0.005 | 0.051

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