# Diglycidyl ether — workplace exposure limit

For Diglycidyl ether, niosh rel (ppm) is TWA 0.1; niosh rel (mg/m³) is 0.5; cas no. is 2238-07-5, verified against its source on 2026-09-08.

- **Substance:** Diglycidyl ether _(verified: appears in its own passage below)_
- **CAS No.:** 2238-07-5 _(verified: appears in its own passage below)_
- **NIOSH REL (ppm):** TWA 0.1 _(verified: appears in the quote below)_
- **NIOSH REL (mg/m³):** 0.5 _(verified: appears in the quote below)_
- **PEL (ppm):** (C)0.5 _(per osha.gov, not stated by the source above)_
- **PEL (mg/m³):** (C)2.8 _(per osha.gov, not stated by the source above)_

## What the source says

> NIOSH REL Ca TWA 0.1 ppm (0.5 mg/m3)

## 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 - Diglycidyl ether

### CAS No.

> CAS No. 2238-07-5

## What osha.gov says

> Diglycidyl ether (DGE) | 2238-07-5 | (C)0.5 | (C)2.8 | - |

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

## What dir.ca.gov says

> 2238075 | | Diglycidyl ether; DGE; bis(2,3-epoxypropyl) ether | 0.1 | 0.5

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

## Source

- https://www.cdc.gov/niosh/npg/npgd0215.html
- https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
- 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/).