Hydrazine — workplace exposure limit
What is the pel (ppm) for Hydrazine — workplace exposure limit?
For Hydrazine, pel (ppm) is 1; pel (mg/m³) is 1.3; cas no. is 302-01-2, verified against its source on 2026-08-05.
Hydrazine | 302-01-2 | 1 | 1.3 | X |
— osha.gov, retrieved 2026-08-05
1
The most of this substance workplace air may legally contain, averaged over an 8-hour shift — OSHA's permissible exposure limit (PEL), in parts per million, from the agency's own table row quoted below. Where federal OSHA and Cal/OSHA disagree, both limits are stated, each with its own agency's table row as evidence. NIOSH's number, where there is one, is shown separately: it is a recommended limit, not a legal one, and it is often the strictest of the three.
- Substance
- Hydrazine verified
- CAS No.
- 302-01-2 verified
- PEL (ppm)
- 1 verified
- PEL (mg/m³)
- 1.3 verified
- NIOSH REL (ppm)
- C 0.03 per cdc.gov
- NIOSH REL (mg/m³)
- 0.04 per cdc.gov
What cdc.gov says
NIOSH REL Ca C 0.03 ppm (0.04 mg/m3) [2-hour]
— cdc.gov, retrieved 2026-09-08
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 1, as of 2026-08-05.
Hydrazine | 302-01-2 | 1 | 1.3 | X |
https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
dir.ca.gov says pel (ppm) is 0.01, as of 2026-08-05.
302012 | S | Hydrazine | 0.01 | 0.013
https://www.dir.ca.gov/title8/5155.html
PEL (mg/m³)
osha.gov says pel (mg/m³) is 1.3, as of 2026-08-05.
Hydrazine | 302-01-2 | 1 | 1.3 | X |
https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
dir.ca.gov says pel (mg/m³) is 0.013, as of 2026-08-05.
302012 | S | Hydrazine | 0.01 | 0.013
Sources
- osha.govhttps://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
- dir.ca.govhttps://www.dir.ca.gov/title8/5155.html
- cdc.govhttps://www.cdc.gov/niosh/npg/npgd0329.html