Isophorone diisocyanate — CAS 4098-71-9 — workplace exposure limit
What is the niosh rel (ppm) for Isophorone diisocyanate — CAS 4098-71-9 — workplace exposure limit?
For Isophorone diisocyanate, niosh rel (ppm) is TWA 0.005; niosh rel (mg/m³) is 0.045; cas no. is 4098-71-9, verified against its source on 2026-09-08.
NIOSH REL TWA 0.005 ppm (0.045 mg/m3) ST 0.02 ppm (0.180 mg/m3) [skin]
— cdc.gov, retrieved 2026-09-08
- Substance
- Isophorone diisocyanate verified
- CAS No.
- 4098-71-9 verified
- NIOSH REL (ppm)
- TWA 0.005 verified
- NIOSH REL (mg/m³)
- 0.045 verified
- PEL (ppm)
- 0.005 per dir.ca.gov
- PEL (mg/m³)
- 0.045 per dir.ca.gov
- STEL (ppm)
- 0.02 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 - Isophorone diisocyanate
CAS No.
CAS No. 4098-71-9
— all from cdc.gov, retrieved 2026-09-08
What dir.ca.gov says
4098719 | S | Isophorone diisocyanate; IPDI | 0.005 | 0.045 | | 0.02 | --
— dir.ca.gov, retrieved 2026-08-05
What dir.ca.gov says
4098719 | | IPDI; see Isophorone diisocyanate
— dir.ca.gov, retrieved 2026-08-05
Sources
- cdc.govhttps://www.cdc.gov/niosh/npg/npgd0356.html
- dir.ca.govhttps://www.dir.ca.gov/title8/5155.html