---
title: "Silica, amorphous (respirable): exposure limits and sampling"
url: https://analyt-mtc.com/tools/hazard-search/silica-amorphous-respirable/
lang: en
alternates:
  en: https://analyt-mtc.com/tools/hazard-search/silica-amorphous-respirable/
  de: https://analyt-mtc.com/de/tools/gefahrstoffsuche/silica-amorphous-respirable/
---

Hazard search

# Silica, amorphous (respirable)

CAS number

No CAS number

## UK workplace exposure limits

| Limit | Value | Applies to |
| --- | --- | --- |
| 8-hour TWA | 2.4 mg/m³ |  |

## Sampling methods

| Method | Sampling | Medium | Analysis | Part numbers |
| --- | --- | --- | --- | --- |
| **MDHS 14/4** / General inhalable or respirable dusts by gravimetric analysis / [Method document (opens in a new tab)](http://www.hse.gov.uk/pubns/mdhs/pdfs/mdhs14-4.pdf) | Active (pump) | IOM & foam (or cyclone) with PVC filter |  | [225-70A](https://analyt-mtc.com/catalog/product/haz-dust-7204-particulate-monitor/#part-225-70a) / [225-772](https://analyt-mtc.com/catalog/product/iom-sampler/#part-225-772) / [225-69](https://analyt-mtc.com/catalog/product/plastic-cyclone/#part-225-69) / [225-5-25](https://analyt-mtc.com/catalog/product/button-sampler/#part-225-5-25) |
| **NIOSH 7501** / Amorphous silica by XRD (respirable) / [Method document (opens in a new tab)](http://www.cdc.gov/niosh/docs/2003-154/pdfs/7501.pdf) | Active (pump) | Cyclone & 5µm PVC filter in cassette |  | [225-01-02](https://analyt-mtc.com/catalog/product/aluminium-respirable-dust-cyclone/#part-225-01-02) / [225-803](https://analyt-mtc.com/catalog/product/gla-5000-pvc-membrane-filters/#part-225-803) / [225-1](https://analyt-mtc.com/catalog/product/aluminium-respirable-dust-cyclone/#part-225-1) |

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)