# Morpholine — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side

For Morpholine, cas no. is 110-91-8; pel (ppm) is 20; pel (mg/m³) is 70, verified against its source on 2026-08-05.

- **Substance:** Morpholine
- **CAS No.:** 110-91-8
- **PEL (ppm):** 20
- **PEL (mg/m³):** 70

## What the source says

> Morpholine | 110-91-8 | 20 | 70 | X |

## Source

- https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1

Last verified: 2026-08-05. Review by: 2027-08-05.
Part of [US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side](https://referencesource.org/workplace-exposure-limits/).