# n-Propyl nitrate — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side

For n-Propyl nitrate, cas no. is 627-13-4; pel (ppm) is 25; pel (mg/m³) is 110, verified against its source on 2026-08-05.

- **Substance:** n-Propyl nitrate
- **CAS No.:** 627-13-4
- **PEL (ppm):** 25
- **PEL (mg/m³):** 110

## What the source says

> n-Propyl nitrate | 627-13-4 | 25 | 110 | - |

## 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.

### PEL (mg/m³)

osha.gov says pel (mg/m³) is **110**, as of 2026-08-05.

> n-Propyl nitrate | 627-13-4 | 25 | 110 | - |

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

dir.ca.gov says pel (mg/m³) is **107**, as of 2026-08-05.

> 627134 | | n-Propyl nitrate | 25 | 107 | | 40 | 170

Source: https://www.dir.ca.gov/title8/5155.html


## Source

- https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
- https://www.dir.ca.gov/title8/5155.html

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/).