4,4′-Methylene dianiline; MDA (see also Sections 1535 & 5200) — CAS 101779 — workplace exposure limit
What is the pel (ppm) for 4,4′-Methylene dianiline; MDA (see also Sections 1535 & 5200) — CAS 101779 — workplace exposure limit?
For 4,4′-Methylene dianiline; MDA (see also Sections 1535 & 5200), pel (ppm) is 0.01; pel (mg/m³) is 0.08; stel (ppm) is 0.1; stel (mg/m³) is 0.8; cas no. is 101779, verified against its source on 2026-09-29.
101779 | S | 4,4′-Methylene dianiline; MDA (see also Sections 1535 & 5200) | 0.01 | 0.08 | | 0.1 | 0.8
— dir.ca.gov, retrieved 2026-08-05
0.01
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
- 4,4′-Methylene dianiline; MDA (see also Sections 1535 & 5200) verified
- CAS No.
- 101779 verified
- PEL (ppm)
- 0.01 verified
- PEL (mg/m³)
- 0.08 verified
- STEL (ppm)
- 0.1 verified
- STEL (mg/m³)
- 0.8 verified
- NIOSH REL, as stated
- Ca See Appendix A per cdc.gov
What cdc.gov says
NIOSH REL Ca See Appendix A
— cdc.gov, retrieved 2026-09-08
Substance
CDC - NIOSH Pocket Guide to Chemical Hazards - 4,4'-Methylenedianiline
CAS No.
CAS No. 101-77-9
The same source also states
101779 | S | MDA; see 4,4′-Methylene dianiline
— dir.ca.gov, retrieved 2026-08-05
Sources
- dir.ca.govhttps://www.dir.ca.gov/title8/5155.html
- cdc.govhttps://www.cdc.gov/niosh/npg/npgd0415.html