---
type: threshold
id: ethyl-tert-butyl-ether
asset: workplace-exposure-limits
title: "Ethyl tert-butyl ether — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side"
sources:
  - https://www.dir.ca.gov/title8/5155.html
source_quote: "637923 | | Ethyl tert-butyl ether | 5 | 21"
generated: true
harvested: 2026-08-05
stale_after: 2027-08-05
substance: "Ethyl tert-butyl ether"
pel_ppm: "5"
pel_mgm3: "21"
verified: true
---
**Substance:** Ethyl tert-butyl ether

**PEL (ppm):** 5

**PEL (mg/m³):** 21

> 637923 | | Ethyl tert-butyl ether | 5 | 21

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