Sodium Hypochlorite COSHH Data Sheet UK
A HSE-format UK COSHH data sheet reference for Sodium Hypochlorite (also known as Bleach, Domestos, Thick Bleach). Covers workplace exposure limits from HSE EH40/2005, GHS hazard classification, control measures, PPE, storage, spillage and emergency procedures. Use the data here to complete your own COSHH assessment, or generate a workplace-specific PDF in 5 minutes.
GHS Hazard Classification
Corrosive (Skin Corr. 1B/1C, Eye Dam. 1), Corrosive to metals (Met. Corr. 1), Oxidising at higher concentrations. H314, H318, H290.
Health Effects
Burning sensation in mouth/throat if ingested. Skin and eye irritation to severe burns depending on concentration. Mixing with acid-based products releases toxic chlorine gas; mixing with ammonia releases toxic chloramines.
Routes of Exposure
- Skin contact
- Eye contact
- Inhalation (if mixed with acids/ammonia)
- Ingestion
Workplace exposure to Sodium Hypochlorite is regulated under the Control of Substances Hazardous to Health Regulations 2002. Employers must reduce occupational exposure to as low as reasonably practicable, following the HSE hierarchy of control.
Recommended Control Measures
Applied in the HSE hierarchy of control order: eliminate, substitute, engineering, administrative, PPE.
- Use ready-diluted product where possible
- Ensure adequate ventilation when in use
- NEVER mix with other chemicals, especially acids or ammonia-based products
- Store in original container, cool well-ventilated area
- Label and lock storage area
Recommended PPE
- Nitrile gloves
- Eye protection (splash goggles)
- Apron for concentrated/bulk handling
Emergency Procedures
Data Sources
UKHSA Compendium of Chemical Hazards; Evans Vanodine SDS; Sevron COSHH guidance
Frequently asked questions
Is a COSHH assessment required for Sodium Hypochlorite?
Yes. Any UK employer whose staff work with Sodium Hypochlorite must hold a written COSHH assessment under the Control of Substances Hazardous to Health Regulations 2002, Regulation 6. The assessment must be reviewed at least annually and immediately if circumstances change. You can generate one free (watermarked) using our tool.
What is the Workplace Exposure Limit for Sodium Hypochlorite?
Workplace Exposure Limits (WELs) for Sodium Hypochlorite are published by HSE in EH40/2005. Values come as an 8-hour time-weighted average (TWA) and 15-minute short-term exposure limit (STEL). Where a formal WEL has not been set for this substance, we mark the field as "Not established" and rely on hazard-based controls following the hierarchy of control.
What PPE is needed for Sodium Hypochlorite?
The recommended PPE typically includes: Nitrile gloves; Eye protection (splash goggles); Apron for concentrated/bulk handling. Actual PPE requirements depend on how Sodium Hypochlorite is used in your specific workplace, how often, and existing engineering controls. Your COSHH assessment should specify PPE only after engineering and administrative controls have been considered.
Do I need health surveillance for workers using Sodium Hypochlorite?
Health surveillance under COSHH 2002 Regulation 10 is required for substances that are respiratory sensitisers, skin sensitisers, or carcinogens where exposure is significant. If Sodium Hypochlorite appears on the HSE health surveillance list for your industry, workers with regular exposure should have baseline and annual monitoring.
Generate a workplace-specific COSHH assessment for Sodium Hypochlorite
Answer 6 quick questions about your workplace and download a 7-page HSE-format PDF. First one is free (watermarked). Paid bundles from £29 for 10 clean PDFs.
Related COSHH data sheets
Related COSHH guides
References
- Control of Substances Hazardous to Health Regulations 2002 (SI 2002/2677), UK legislation.gov.uk
- HSE EH40/2005 Workplace Exposure Limits, Health and Safety Executive
- COSHH basics: What you need to know, HSE
- COSHH essentials, control guidance for employers, HSE
- L5, Approved Code of Practice and guidance, HSE