---
title: "Morpholine (110-91-8): exposure limits and sampling"
url: https://analyt-mtc.com/tools/hazard-search/morpholine-110-91-8/
lang: en
alternates:
  en: https://analyt-mtc.com/tools/hazard-search/morpholine-110-91-8/
  de: https://analyt-mtc.com/de/tools/gefahrstoffsuche/morpholine-110-91-8/
---

Hazard search

# Morpholine

CAS number

110-91-8

Also known as

Diethylene imidoxide · Diethylene oximide · Tetrahydro-1,4-oxazine

## UK workplace exposure limits

| Limit | Value | Applies to |
| --- | --- | --- |
| 8-hour TWA | 10 ppm |  |
| 8-hour TWA | 36 mg/m³ |  |
| 15-minute STEL | 20 ppm |  |
| 15-minute STEL | 72 mg/m³ |  |

### Notations

-   Sk: can be absorbed through the skin

## Sampling methods

| Method | Sampling | Medium | Analysis | Part numbers |
| --- | --- | --- | --- | --- |
| **OSHA PV2123** / Morpholine by GC-FID / [Method document (opens in a new tab)](https://www.osha.gov/sites/default/files/methods/osha-pv2123.pdf) | Active (pump) | Coated XAD-7 tube (80/40mg) | GC-FID | [226-98](https://analyt-mtc.com/catalog/product/skc-xad-sorbent-tubes/#part-226-98) |
| **Non-agency** / Morpholine by Colorimetric analysis | Direct-reading | Gastec Detector Tube |  | [810-180](https://analyt-mtc.com/catalog/product/gastec-colour-gas-detector-tubes/#part-gst-180) / [810-180L](https://analyt-mtc.com/catalog/product/gastec-colour-gas-detector-tubes/#part-gst-180l) |

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/)