Muriatic Acid (Hydrochloric) in Construction
Construction · Ver en español
Talking points
- Muriatic acid (hydrochloric acid) is commonly used for cleaning masonry, etching concrete, and removing mortar stains. It is extremely corrosive and releases toxic fumes.
- The OSHA ceiling limit for hydrochloric acid is 5 ppm. Even below this level, fumes irritate the eyes, nose, throat, and lungs. Work outdoors or with strong ventilation.
- Always dilute acid by adding it to water — never the reverse. Start with a weak dilution and increase concentration only if needed. Stronger is not always better.
- Required PPE includes chemical splash goggles, acid-resistant gloves (butyl rubber or neoprene), a rubber apron, and rubber boots. A respirator with acid gas cartridges may be needed indoors.
- Neutralize spills with baking soda (sodium bicarbonate) or lime before cleanup. Never wash muriatic acid into storm drains — it is an environmental violation.
Ask the crew
If we are using muriatic acid today, do we have the correct PPE, a spill neutralizer, and adequate ventilation?
Standards this talk is built on
A toolbox talk is a short safety briefing. It supports the training a standard requires; it does not replace it.
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