Acids & Alkalis (Brick Acid, Cleaners) COSHH assessment
Acids and alkalis are used to clean brickwork, remove mortar, descale and clean plant. They are corrosive and cause serious burns to skin and eyes, and give off harmful fumes.
The hazards
- Corrosive - cause serious burns to skin and eyes
- Fumes irritate the airways, especially in enclosed areas
- Violent reactions if acids and alkalis are mixed
- Splashes during dilution and application
Who is at risk
Exposure routes
- Skin contact
- Eye contact (splashes)
- Inhalation of fumes
Health effects
- Chemical burns to skin and eyes
- Respiratory irritation and coughing
- Permanent eye damage from splashes
Control measures (hierarchy of control)
Controls should be applied in order — eliminate or substitute first, then engineering controls, then PPE as the last line.
- Substitute for a less hazardous product where possible
- Always add acid to water, never water to acid, and never mix products
- Ventilate the area; avoid enclosed spaces where fumes build up
- Use the correct dilution from the label; have water to hand for washing
- Provide eyewash and washing facilities
PPE & RPE
- Chemical-resistant gloves and apron
- Face shield or goggles
- Suitable boots
- RPE where fumes cannot be controlled
First aid
- Skin: rinse with plenty of water and remove contaminated clothing
- Eyes: irrigate with clean water for at least 20 minutes and get urgent medical help
- Fumes: move to fresh air
Workplace exposure limit (WEL)
Relevant legislation & guidance
Acids & Alkalis (Brick Acid, Cleaners) COSHH FAQs
Yes - brick acid is typically hydrochloric acid, which is corrosive and gives off irritating fumes. It causes burns to skin and eyes, so it needs a COSHH assessment covering dilution, ventilation, PPE and eyewash provision.
No - never mix acids and alkalis or different cleaning products. They can react violently and release dangerous gases. Use each product at its label dilution only.
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