Methylene bis(4-cyclohexylisocyanate) — CAS 5124-30-1 — workplace exposure limit
What is the niosh rel (ppm) for Methylene bis(4-cyclohexylisocyanate) — CAS 5124-30-1 — workplace exposure limit?
For Methylene bis(4-cyclohexylisocyanate), niosh rel (ppm) is C 0.01; niosh rel (mg/m³) is 0.11; cas no. is 5124-30-1, verified against its source on 2026-09-08.
NIOSH REL C 0.01 ppm (0.11 mg/m3)
— cdc.gov, retrieved 2026-09-08
- Substance
- Methylene bis(4-cyclohexylisocyanate) verified
- CAS No.
- 5124-30-1 verified
- NIOSH REL (ppm)
- C 0.01 verified
- NIOSH REL (mg/m³)
- 0.11 verified
- PEL (ppm)
- 0.005 per dir.ca.gov
- PEL (mg/m³)
- 0.054 per dir.ca.gov
Where each value comes from
This source states these in separate places, so each value is shown with the passage that states it.
Substance
CDC - NIOSH Pocket Guide to Chemical Hazards - Methylene bis(4-cyclohexylisocyanate)
CAS No.
CAS No. 5124-30-1
— all from cdc.gov, retrieved 2026-09-08
What dir.ca.gov says
5124301 | | Methylene bis(4-cyclohexylisocyanate); hydrogenated MDI | 0.005 | 0.054
— dir.ca.gov, retrieved 2026-08-05
What dir.ca.gov says
5124301 | | Dicyclohexylmethane-4,4'-diisocyanate; see Methylene bis-(4-cyclohexylisocyanate)
— dir.ca.gov, retrieved 2026-08-05
Sources
- cdc.govhttps://www.cdc.gov/niosh/npg/npgd0412.html
- dir.ca.govhttps://www.dir.ca.gov/title8/5155.html