---
title: "Formic acid (64-18-6): exposure limits and sampling"
url: https://analyt-mtc.com/tools/hazard-search/formic-acid-64-18-6/
lang: en
alternates:
  en: https://analyt-mtc.com/tools/hazard-search/formic-acid-64-18-6/
  de: https://analyt-mtc.com/de/tools/gefahrstoffsuche/formic-acid-64-18-6/
---

Hazard search

# Formic acid

CAS number

64-18-6

Also known as

Methanoic acid

## UK workplace exposure limits

| Limit | Value | Applies to |
| --- | --- | --- |
| 8-hour TWA | 5 ppm |  |
| 8-hour TWA | 9.6 mg/m³ |  |

## Sampling methods

| Method | Sampling | Medium | Analysis | Part numbers |
| --- | --- | --- | --- | --- |
| **NIOSH 2011** / Formic acid by IC / [Method document (opens in a new tab)](https://www.cdc.gov/niosh/docs/2003-154/pdfs/2011.pdf) | Active (pump) | PTFE filter (5µm) with Silica gel tube (400/200mg) | IC-CD | [225-1728A](https://analyt-mtc.com/catalog/product/ptfe-polytetrafluoroethylene-filters/#part-225-1728a) / [225-3-25LF](https://analyt-mtc.com/catalog/product/aluminium-respirable-dust-cyclone/#part-225-3-25lf) / [226-10-03](https://analyt-mtc.com/catalog/product/skc-silica-gel-sorbent-tubes/#part-226-10-03) / [225-1](https://analyt-mtc.com/catalog/product/aluminium-respirable-dust-cyclone/#part-225-1) |
| **Non-agency** / Formic acid by Colorimetric analysis | Direct-reading | Gastec detector tube |  | [810-81](https://analyt-mtc.com/catalog/product/gastec-colour-gas-detector-tubes/#part-gst-81) / [810-81L](https://analyt-mtc.com/catalog/product/gastec-colour-gas-detector-tubes/#part-gst-81l) |
| **Non-agency** / Formic acid by Colorimetric analysis | Passive | Gastec Dosi-tube |  | [810-81D](https://analyt-mtc.com/catalog/product/gastec-passive-dosi-tubes/#part-gst-81d) |
| **Non-agency** / Acetic acid and formic acid by IC /CD / [Method document (opens in a new tab)](https://www.nature.com/articles/s40494-021-00495-3) | Passive | Passive sampler |  | [500-200](https://analyt-mtc.com/catalog/product/skc-umex-200-passive-sampler-so2-no2/#part-500-200) |
| **Other** | Passive |  | IC/CD | [500-200](https://analyt-mtc.com/catalog/product/skc-umex-200-passive-sampler-so2-no2/#part-500-200) |
| **Other** | Passive |  | DR | [810-81D](https://analyt-mtc.com/catalog/product/gastec-passive-dosi-tubes/#part-gst-81d) |

Methods and limits as published by their agencies and summarised by SKC; check the current method and the limit that applies to you before sampling.

Source: [SKC Ltd (UK), Hazard Search, used with SKC's permission (opens in a new tab)](https://www.skcltd.com/hazard-search.html); [SKC Inc. (USA), Sampling Guides, used with SKC's permission (opens in a new tab)](https://international.skcinc.com/sampling-guides/)