# 2-Isopropoxyethanol — workplace exposure limit

For 2-Isopropoxyethanol, niosh rel, as stated is See Appendix D; cas no. is 109-59-1, verified against its source on 2026-09-08.

- **Substance:** 2-Isopropoxyethanol _(verified: appears in its own passage below)_
- **CAS No.:** 109-59-1 _(verified: appears in its own passage below)_
- **NIOSH REL, as stated:** See Appendix D _(verified: appears in the quote below)_
- **PEL (ppm):** 25 _(per dir.ca.gov, not stated by the source above)_
- **PEL (mg/m³):** 105 _(per dir.ca.gov, not stated by the source above)_

## What the source says

> NIOSH REL See Appendix D

## 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 - 2-Isopropoxyethanol

### CAS No.

> CAS No. 109-59-1

## What dir.ca.gov says

> 109591 | | Isopropoxyethanol | 25 | 105

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

## Source

- https://www.cdc.gov/niosh/npg/npgd0357.html
- https://www.dir.ca.gov/title8/5155.html

Last verified: 2026-09-08. Review by: 2027-08-05.
Part of [US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side](https://referencesource.org/workplace-exposure-limits/).