Isopropyl ether — CAS 108-20-3 — workplace exposure limit
What is the pel (ppm) for Isopropyl ether — CAS 108-20-3 — workplace exposure limit?
For Isopropyl ether, pel (ppm) is disputed: 500 per osha.gov, 250 per dir.ca.gov; pel (mg/m³) is disputed: 2100 per osha.gov, 1,050 per dir.ca.gov; cas no. is 108-20-3, verified against its source on 2026-08-05.
Isopropyl ether | 108-20-3 | 500 | 2100 | - |
— osha.gov, retrieved 2026-08-05
- Substance
- Isopropyl ether verified
- CAS No.
- 108-20-3 verified
- PEL (ppm)
- 500 sources disagree
- PEL (mg/m³)
- 2100 sources disagree
- NIOSH REL (ppm)
- TWA 500 per cdc.gov
- NIOSH REL (mg/m³)
- 2100 per cdc.gov
What cdc.gov says
NIOSH REL TWA 500 ppm (2100 mg/m3)
— cdc.gov, retrieved 2026-09-08
Substance
CDC - NIOSH Pocket Guide to Chemical Hazards - Isopropyl ether
CAS No.
CAS No. 108-20-3
What dir.ca.gov says
108203 | | Diisopropyl ether; see Isopryl ether
— dir.ca.gov, retrieved 2026-08-05
Sources disagree
More than one authority states this, and they do not state the same thing. Both are reproduced with the source each came from — deciding between them is yours, not ours.
PEL (ppm)
osha.gov says pel (ppm) is 500, as of 2026-08-05.
Isopropyl ether | 108-20-3 | 500 | 2100 | - |
https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
dir.ca.gov says pel (ppm) is 250, as of 2026-08-05.
108203 | | Isopropyl ether; diisopropyl ether | 250 | 1,050
https://www.dir.ca.gov/title8/5155.html
PEL (mg/m³)
osha.gov says pel (mg/m³) is 2100, as of 2026-08-05.
Isopropyl ether | 108-20-3 | 500 | 2100 | - |
https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
dir.ca.gov says pel (mg/m³) is 1,050, as of 2026-08-05.
108203 | | Isopropyl ether; diisopropyl ether | 250 | 1,050
Sources
- osha.govhttps://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
- cdc.govhttps://www.cdc.gov/niosh/npg/npgd0362.html
- dir.ca.govhttps://www.dir.ca.gov/title8/5155.html