---
type: threshold
id: trimethyl-phosphite
asset: workplace-exposure-limits
title: "Trimethyl phosphite — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side"
sources:
  - https://www.dir.ca.gov/title8/5155.html
source_quote: "121459 | | Trimethyl phosphite | 2 | 10"
generated: true
harvested: 2026-08-05
stale_after: 2027-08-05
substance: "Trimethyl phosphite"
pel_ppm: "2"
pel_mgm3: "10"
verified: true
---
**Substance:** Trimethyl phosphite

**PEL (ppm):** 2

**PEL (mg/m³):** 10

> 121459 | | Trimethyl phosphite | 2 | 10

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