Methylal — CAS 109-87-5 — workplace exposure limit
What is the niosh rel (ppm) for Methylal — CAS 109-87-5 — workplace exposure limit?
For Methylal, niosh rel (ppm) is TWA 1000; niosh rel (mg/m³) is 3100; cas no. is 109-87-5, verified against its source on 2026-09-08.
NIOSH REL TWA 1000 ppm (3100 mg/m3)
— cdc.gov, retrieved 2026-09-08
- Substance
- Methylal verified
- CAS No.
- 109-87-5 verified
- NIOSH REL (ppm)
- TWA 1000 verified
- NIOSH REL (mg/m³)
- 3100 verified
- PEL (ppm)
- 1000 per osha.gov
- PEL (mg/m³)
- 3100 per osha.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 - Methylal
CAS No.
CAS No. 109-87-5
— all from cdc.gov, retrieved 2026-09-08
What osha.gov says
Methylal (Dimethoxy-methane) | 109-87-5 | 1000 | 3100 | - |
— osha.gov, retrieved 2026-08-05
What dir.ca.gov says
109875 | | Methylal; dimethoxymethane | 1,000 | 3,100
— dir.ca.gov, retrieved 2026-08-05
What dir.ca.gov says
109875 | | Dimethoxymethane; see Methylal
— dir.ca.gov, retrieved 2026-08-05
Sources
- cdc.govhttps://www.cdc.gov/niosh/npg/npgd0396.html
- osha.govhttps://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
- dir.ca.govhttps://www.dir.ca.gov/title8/5155.html