---
type: threshold
id: formic-acid
asset: workplace-exposure-limits
title: "Formic acid — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side"
sources:
  - https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
source_quote: "Formic acid | 64-18-6 | 5 | 9 | - |"
generated: true
harvested: 2026-08-05
stale_after: 2027-08-05
substance: "Formic acid"
cas_number: "64-18-6"
pel_ppm: "5"
pel_mgm3: "9"
verified: true
---
**Substance:** Formic acid

**CAS No.:** 64-18-6

**PEL (ppm):** 5

**PEL (mg/m³):** 9

> Formic acid | 64-18-6 | 5 | 9 | - |

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