Naphthalene diisocyanate; NDI — CAS 25551284 — workplace exposure limit
What is the pel (ppm) for Naphthalene diisocyanate; NDI — CAS 25551284 — workplace exposure limit?
For Naphthalene diisocyanate; NDI, pel (ppm) is 0.01; pel (mg/m³) is 0.085; ceiling notation is the values given in the PEL columns are ceiling values; cas no. is 25551284, verified against its source on 2026-09-29.
25551284 | | Naphthalene diisocyanate; NDI | 0.01 | 0.085 | C
— dir.ca.gov, retrieved 2026-09-28
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
- Naphthalene diisocyanate; NDI verified
- CAS No.
- 25551284 verified
- PEL (ppm)
- 0.01 verified
- PEL (mg/m³)
- 0.085 verified
- Ceiling notation
- the values given in the PEL columns are ceiling values verified
Where each value comes from
The value above is stated away from the sentence quoted with the answer, so the passage that states it is shown here too.
Ceiling notation
A “C” notation in this column means the values given in the PEL columns are ceiling values.
— all from dir.ca.gov, retrieved 2026-09-28
Source
- dir.ca.govhttps://www.dir.ca.gov/title8/5155.html