---
title: "Direct black 38 (1937-37-7): exposure limits and sampling"
url: https://analyt-mtc.com/tools/hazard-search/direct-black-38-1937-37-7/
lang: en
alternates:
  en: https://analyt-mtc.com/tools/hazard-search/direct-black-38-1937-37-7/
  de: https://analyt-mtc.com/de/tools/gefahrstoffsuche/direct-black-38-1937-37-7/
---

Hazard search

# Direct black 38

CAS number

1937-37-7

Also known as

Direct black 38 (dyes, benzidine)

## UK workplace exposure limits

Our data hold no UK limit for this substance.

## Sampling methods

| Method | Sampling | Medium | Analysis | Part numbers |
| --- | --- | --- | --- | --- |
| **NIOSH 5013** | Active (pump) |  | HPLC | [225-17P](https://analyt-mtc.com/catalog/product/ptfe-polytetrafluoroethylene-filters/#part-225-17p) / [225-3LF](https://analyt-mtc.com/catalog/product/aluminium-respirable-dust-cyclone/#part-225-3lf) / [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 Inc. (USA), Sampling Guides, used with SKC's permission (opens in a new tab)](https://international.skcinc.com/sampling-guides/)