# Graphite (natural) — workplace exposure limit

For Graphite (natural), niosh rel, as stated is TWA 2.5 mg/m3 (resp); cas no. is 7782-42-5, verified against its source on 2026-09-08.

- **Substance:** Graphite (natural) _(verified: appears in its own passage below)_
- **CAS No.:** 7782-42-5 _(verified: appears in its own passage below)_
- **NIOSH REL, as stated:** TWA 2.5 mg/m3 (resp) _(verified: appears in the quote below)_
- **PEL (mg/m³):** 2.5 _(per dir.ca.gov, not stated by the source above)_

## What the source says

> NIOSH REL TWA 2.5 mg/m3 (resp)

## 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 - Graphite (natural)

### CAS No.

> CAS No. 7782-42-5

## What osha.gov says

> Graphite, natural, respirable dust | 7782-42-5 | - | (3) | - |

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

## What dir.ca.gov says

> 7782425 | | Graphite, natural respirable dust | | 2.5

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

## Source

- https://www.cdc.gov/niosh/npg/npgd0306.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/).