How to notify us over the holiday period.
Notifications  
If someone has been seriously injured, become seriously ill, or died as a result of work – phone us on 0800 030 040 straight away. We have staff available to respond to these 24/7.
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Notifications made through our online form won't be monitored between 12pm on Tuesday 24 December 2024 and 8.30am on Monday 6 January 2025.
If you’re not sure if you need to notify us, use our online notification system and we’ll respond to you after 6 January 2025.
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If you have a health and safety concern that isn’t urgent, use our online form and we’ll respond to you after 6 January 2025.
Raise a health or safety concern
General enquiries
General enquiries made by phone or email after 12pm on Tuesday 24 December will be responded to from Monday 6 January 2025. This does not apply to notifications made by phone on 0800 030 040.
We wish you a safe and relaxing holiday.
CAS number
7803-51-2Workplace exposure standards
- TWA
- 0.3 ppm
- 0.42 mg/m3
- STEL
- 1 ppm
- 1.4 mg/m3
- CEILING
- -
- -
Notations
†: This is an interim WES or BEI
- Notes
- Current WES values will be maintained as interim values with a change to WES-TWA to 0.05ppm, and a WES-STEL of 0.2ppm to take effect in 2024 to protect for respiratory tract irritation and pulmonary oedema.
- Year adopted
- 2023
- Next review
- -
External resources
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