# Mica (containing less than 1% quartz) — workplace exposure limit

For Mica (containing less than 1% quartz), niosh rel, as stated is TWA 3 mg/m3 (resp); cas no. is 12001-26-2, verified against its source on 2026-09-08.

- **Substance:** Mica (containing less than 1% quartz) _(verified: appears in its own passage below)_
- **CAS No.:** 12001-26-2 _(verified: appears in its own passage below)_
- **NIOSH REL, as stated:** TWA 3 mg/m3 (resp) _(verified: appears in the quote below)_
- **PEL (mg/m³):** 3 _(per dir.ca.gov, not stated by the source above)_

## What the source says

> NIOSH REL TWA 3 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 - Mica (containing less than 1% quartz)

### CAS No.

> CAS No. 12001-26-2

## What osha.gov says

> Mica (respirable dust) | 12001-26-2 | - | (3) | - |

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

## What dir.ca.gov says

> 12001262 | | Mica (respirable dust) | -- | 3

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

## Source

- https://www.cdc.gov/niosh/npg/npgd0431.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/).