# Phenyl ether-biphenyl mixture (vapor) — workplace exposure limit

For Phenyl ether-biphenyl mixture (vapor), niosh rel (ppm) is TWA 1; niosh rel (mg/m³) is 7; cas no. is 8004-13-5, verified against its source on 2026-09-08.

- **Substance:** Phenyl ether-biphenyl mixture (vapor) _(verified: appears in its own passage below)_
- **CAS No.:** 8004-13-5 _(verified: appears in its own passage below)_
- **NIOSH REL (ppm):** TWA 1 _(verified: appears in the quote below)_
- **NIOSH REL (mg/m³):** 7 _(verified: appears in the quote below)_

## What the source says

> NIOSH REL TWA 1 ppm (7 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 - Phenyl ether-biphenyl mixture (vapor)

### CAS No.

> CAS No. 8004-13-5

## Source

- https://www.cdc.gov/niosh/npg/npgd0683.html

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