Dimethyl sulfate — CAS 77-78-1 — workplace exposure limit
What is the pel (ppm) for Dimethyl sulfate — CAS 77-78-1 — workplace exposure limit?
For Dimethyl sulfate, pel (ppm) is disputed: 1 per osha.gov, 0.1 per dir.ca.gov; pel (mg/m³) is disputed: 5 per osha.gov, 0.5 per dir.ca.gov; cas no. is 77-78-1, verified against its source on 2026-08-05.
Dimethyl sulfate | 77-78-1 | 1 | 5 | X |
— osha.gov, retrieved 2026-08-05
- Substance
- Dimethyl sulfate verified
- CAS No.
- 77-78-1 verified
- PEL (ppm)
- 1 sources disagree
- PEL (mg/m³)
- 5 sources disagree
- NIOSH REL (ppm)
- TWA 0.1 per cdc.gov
- NIOSH REL (mg/m³)
- 0.5 per cdc.gov
What cdc.gov says
NIOSH REL Ca TWA 0.1 ppm (0.5 mg/m3) [skin]
— cdc.gov, retrieved 2026-09-08
Substance
CDC - NIOSH Pocket Guide to Chemical Hazards - Dimethyl sulfate
CAS No.
CAS No. 77-78-1
What dir.ca.gov says
77781 | | Methyl sulfate; see Dimethyl sulfate
— 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 1, as of 2026-08-05.
Dimethyl sulfate | 77-78-1 | 1 | 5 | X |
https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
dir.ca.gov says pel (ppm) is 0.1, as of 2026-08-05.
77781 | S | Dimethyl sulfate; methyl sulfate | 0.1 | 0.5
https://www.dir.ca.gov/title8/5155.html
PEL (mg/m³)
osha.gov says pel (mg/m³) is 5, as of 2026-08-05.
Dimethyl sulfate | 77-78-1 | 1 | 5 | X |
https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
dir.ca.gov says pel (mg/m³) is 0.5, as of 2026-08-05.
77781 | S | Dimethyl sulfate; methyl sulfate | 0.1 | 0.5
Sources
- osha.govhttps://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
- cdc.govhttps://www.cdc.gov/niosh/npg/npgd0229.html
- dir.ca.govhttps://www.dir.ca.gov/title8/5155.html