---
type: threshold
id: methylene-bisphenyl-isocyanate-mdi
asset: workplace-exposure-limits
title: "Methylene bisphenyl isocyanate (MDI) — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side"
sources:
  - https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
source_quote: "Methylene bisphenyl isocyanate (MDI) | 101-68-8 | (C)0.02 | (C)0.2 | - |"
generated: true
harvested: 2026-08-05
stale_after: 2027-08-05
substance: "Methylene bisphenyl isocyanate (MDI)"
cas_number: "101-68-8"
pel_ppm: "(C)0.02"
pel_mgm3: "(C)0.2"
verified: true
---
**Substance:** Methylene bisphenyl isocyanate (MDI)

**CAS No.:** 101-68-8

**PEL (ppm):** (C)0.02

**PEL (mg/m³):** (C)0.2

> Methylene bisphenyl isocyanate (MDI) | 101-68-8 | (C)0.02 | (C)0.2 | - |

Source: <https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1>