Hazard search
Methanethiol
- CAS number
- 74-93-1
- Also known as
- Mercaptomethane · Methyl mercaptan · Thiomethanol
UK workplace exposure limits
| Limit | Value | Applies to |
|---|---|---|
| 8-hour TWA | 0.5 ppm | |
| 8-hour TWA | 1 mg/m³ |
Sampling methods
| Method | Sampling | Medium | Analysis | Part numbers |
|---|---|---|---|---|
| NIOSH 2542 Mercaptans by GC-FPD Method document (opens in a new tab) | Active (pump) | Coated glass fibre filter in cassette | GC-FPD | 225-9007 225-1 |
| OSHA 26 Methyl mercaptan by GC-FPD Method document (opens in a new tab) | Active (pump) | Coated glass fibre filter in cassette | GC-FPD | 225-9007 225-1 |
| Non-agency Methyl mercaptan by Colorimetric analysis | Direct-reading | Gastec Detector Tube | 810-71H 810-71 810-70 810-70L 810-70LN | |
| Non-agency 42 | Active (pump) | GC-FPD | 231-10 |
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); SKC Inc. (USA), Sampling Guides, used with SKC's permission (opens in a new tab)