---
title: "Dichlorofluoromethane (75-43-4): sampling methods"
url: https://analyt-mtc.com/tools/hazard-search/dichlorofluoromethane-75-43-4/
lang: en
alternates:
  en: https://analyt-mtc.com/tools/hazard-search/dichlorofluoromethane-75-43-4/
  de: https://analyt-mtc.com/de/tools/gefahrstoffsuche/dichlorofluoromethane-75-43-4/
---

Hazard search

# Dichlorofluoromethane

CAS number

75-43-4

Also known as

Dichloromonofluoromethane · Dichloromonofluoromethane (dichlorofluoromethane) · Fluorodichloromethane · Freon 21 · HCFC 21

## UK workplace exposure limits

| Limit | Value | Applies to |
| --- | --- | --- |
| 8-hour TWA | 10 ppm |  |
| 8-hour TWA | 43 mg/m³ |  |

## Sampling methods

| Method | Sampling | Medium | Analysis | Part numbers |
| --- | --- | --- | --- | --- |
| **MDHS 96** | Active (pump) |  | GC-FID | [226-01](https://analyt-mtc.com/catalog/product/skc-anasorb-sorbent-tubes/) |
| **MDHS 96** / VOCs by solvent desorption and GC / [Method document (opens in a new tab)](https://www.hse.gov.uk/pubns/mdhs/pdfs/mdhs96.pdf) | Active (pump) | Two charcoal tubes in series (front 400mg, rear 200mg) |  | [226-25](https://analyt-mtc.com/catalog/product/skc-anasorb-sorbent-tubes/#part-226-25) |
| **NIOSH 1018** / Dichlorodifluoromethane by GC-FID / [Method document (opens in a new tab)](http://www.cdc.gov/niosh/docs/2003-154/pdfs/1018.pdf) | Active (pump) | Two charcoal tubes in series (front 400/200mg, back 100/50mg) |  | [226-09](https://analyt-mtc.com/catalog/product/skc-anasorb-sorbent-tubes/) / [226-01](https://analyt-mtc.com/catalog/product/skc-anasorb-sorbent-tubes/) |
| **NIOSH 2516** / Dichlorofluoromethane by GC-FID / [Method document (opens in a new tab)](http://www.cdc.gov/niosh/docs/2003-154/pdfs/2516.pdf) | Active (pump) | Two charcoal tubes in series (front 400mg, back 200mg) | GC-FID | [226-25](https://analyt-mtc.com/catalog/product/skc-anasorb-sorbent-tubes/#part-226-25) |

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/)