# Osmium Tetroxide — OSHA PSM vs EPA RMP: chemical threshold quantities side by side

For Osmium Tetroxide, cas no. is 20816-12-0; osha psm tq (lbs) is 100, verified against its source on 2026-08-15.

- **Substance:** Osmium Tetroxide _(verified: appears in the quote below)_
- **CAS No.:** 20816-12-0 _(verified: appears in the quote below)_
- **OSHA PSM TQ (lbs):** 100 _(verified: appears in the quote below)_

## What the source says

> Osmium Tetroxide | 20816-12-0 | 100

## Source

- https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.119AppA

Last verified: 2026-08-15. Review by: 2027-08-15.
Part of [OSHA PSM vs EPA RMP: chemical threshold quantities side by side](https://referencesource.org/psm-rmp-chemical-threshold-crossref/).