---
title: "Diacetyl (431-03-8): exposure limits and sampling"
url: https://analyt-mtc.com/tools/hazard-search/diacetyl-431-03-8/
lang: en
alternates:
  en: https://analyt-mtc.com/tools/hazard-search/diacetyl-431-03-8/
  de: https://analyt-mtc.com/de/tools/gefahrstoffsuche/diacetyl-431-03-8/
---

Hazard search

# Diacetyl

CAS number

431-03-8

Also known as

2,3-Butanedione

## UK workplace exposure limits

| Limit | Value | Applies to |
| --- | --- | --- |
| 8-hour TWA | 0.02 ppm |  |
| 8-hour TWA | 0.07 mg/m³ |  |
| 15-minute STEL | 0.1 ppm |  |
| 15-minute STEL | 0.36 mg/m³ |  |

## Sampling methods

| Method | Sampling | Medium | Analysis | Part numbers |
| --- | --- | --- | --- | --- |
| **NIOSH 2557** / Diacetyl by GC-FID / [Method document (opens in a new tab)](http://www.cdc.gov/niosh/docs/2003-154/pdfs/2557.pdf) | Active (pump) | Anasorb CMS tube (150/75mg) |  |  |
| **OSHA 1012** | Active (pump) |  | GC-FID | [226-10-03](https://analyt-mtc.com/catalog/product/skc-silica-gel-sorbent-tubes/#part-226-10-03) |
| **OSHA 1012** / GC-FID / [Method document (opens in a new tab)](https://www.osha.gov/sites/default/files/methods/osha-1012.pdf) | Active (pump) | Sorbent Tube | GC-ECD | [226-183](https://analyt-mtc.com/catalog/product/skc-silica-gel-sorbent-tubes/#part-226-183) |
| **OSHA PV2118** / Diacetyl by GC-FID / [Method document (opens in a new tab)](https://www.osha.gov/sites/default/files/methods/osha-pv2118.pdf) | Active (pump) | Two silica gel tubes in series (150/75mg) |  | [226-10](https://analyt-mtc.com/catalog/product/skc-silica-gel-sorbent-tubes/#part-226-10) |
| **Non-agency** / Diacetyl by Colorimetric analysis | Direct-reading | Gastec detector tube |  | [810-92](https://analyt-mtc.com/catalog/product/gastec-colour-gas-detector-tubes/#part-gst-92) |

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/)