# Tungsten, insoluble compounds, as W — workplace exposure limit

For Tungsten, insoluble compounds, as W, pel (mg/m³) is 5; stel (mg/m³) is 10, verified against its source on 2026-09-29.

- **Substance:** Tungsten, insoluble compounds, as W _(verified: appears in the quote below)_
- **PEL (mg/m³):** 5 _(verified: appears in the quote below)_
- **STEL (mg/m³):** 10 _(verified: appears in the quote below)_

## What the source says

> Tungsten, insoluble compounds, as W | -- | 5 | | -- | 10

## Source

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

Last verified: 2026-09-29. Review by: 2027-09-29.
Part of [US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side](https://referencesource.org/workplace-exposure-limits/).