# Sulfur Trioxide (also called Sulfuric Anhydride) — OSHA PSM vs EPA RMP: chemical threshold quantities side by side

For Sulfur Trioxide (also called Sulfuric Anhydride), cas no. is 7446-11-9; osha psm tq (lbs) is 1000, verified against its source on 2026-08-15.

- **Substance:** Sulfur Trioxide (also called Sulfuric Anhydride) _(verified: appears in the quote below)_
- **CAS No.:** 7446-11-9 _(verified: appears in the quote below)_
- **OSHA PSM TQ (lbs):** 1000 _(verified: appears in the quote below)_

## What the source says

> Sulfur Trioxide (also called Sulfuric Anhydride) | 7446-11-9 | 1000

## 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/).