Working with Acids and Bases Toolbox Talk

Acids and bases can cause serious burns, eye damage, breathing irritation, and dangerous reactions if they are handled the wrong way. Concrete cleaners, drain cleaners, battery acid, descalers, caustic cleaners, pH adjusters, and some chemical treatments can injure workers through splashes, fumes, mist, or contaminated clothing.

This talk focuses on safe handling of acids and bases, using the right PPE, preventing mixing mistakes, controlling spills, and knowing when to stop work because the chemical hazard is not controlled.

Why This Matters

• Acids and bases can burn skin and eyes quickly, even from small splashes.
• Strong chemicals can damage gloves, boots, clothing, tools, containers, and finished surfaces.
• Mixing acids and bases with each other or with other chemicals can create heat, fumes, pressure, or violent reactions.
• Fumes or mist can irritate the lungs, especially in basements, tanks, rooms, pits, or poorly ventilated areas.
• Contaminated PPE, rags, buckets, and tools can spread chemical residue to clean areas and other workers.

Common Hazards

• Pouring or mixing acids and bases too fast and causing splashback, foaming, or heat buildup.
• Using gloves, goggles, face shields, aprons, boots, or sleeves that are not rated for the chemical.
• Storing acids and bases together or near bleach, ammonia, oxidizers, fuels, solvents, or unknown materials.
• Using unlabeled spray bottles, buckets, pumps, or containers for chemical transfer.
• Opening containers without checking for leaks, pressure, damaged caps, dried residue, or strong fumes.
• Residue left in a sprayer, hose, bucket, or drain reacting with a different chemical used later.

Safety Checklist

Before Work Begins

• Read the product label, safety data sheet, mixing instructions, first aid steps, and disposal requirements.
• Confirm the chemical is clearly labeled and approved for the task.
• Select chemical-resistant gloves, splash goggles, face shield, apron, sleeves, boots, and protective clothing as required.
• Inspect containers, pumps, hoses, sprayers, buckets, funnels, and transfer tools before use.
• Set up eyewash, wash water, spill supplies, ventilation, and emergency contacts before handling starts.
• Separate acids and bases from incompatible materials and store them in approved containers with secondary containment.

During Work

• Add chemicals only in the order and amount listed in the manufacturer instructions.
• Pour and mix slowly to reduce splashing, fumes, foaming, heat, and pressure.
• Keep containers closed when not in use and wipe up drips using the approved cleanup method.
• Do not mix acids, bases, cleaners, bleach, ammonia, solvents, or unknown chemicals unless the safety data sheet allows it.
• Keep chemical residue away from skin, eyes, regular clothing, drains, electrical equipment, tools, and traffic areas.
• Remove contaminated PPE carefully so the outside surface does not touch skin or clean clothing.

Crew Talking Points

• What acids or bases are being used, stored, or disposed of today?
• What PPE is required for mixing, applying, cleanup, and disposal?
• Where are the splash zones, transfer points, containers, hoses, and pumps most likely to leak?
• What chemicals must be kept away from this product?
• Where are the eyewash station, wash water, spill kit, safety data sheet, and emergency contacts?
• Speak up if you see missing labels, leaking containers, wrong PPE, strong fumes, unsafe mixing, or chemical residue on tools or clothing.

Stop Work If

• The acid or base is unlabeled, unknown, leaking, reacting, overheating, or stored in a damaged container.
• Required gloves, goggles, face shield, apron, boots, ventilation, eyewash, or spill supplies are missing.
• Workers are unsure how to mix, dilute, apply, clean up, or dispose of the chemical safely.
• Chemical contacts skin, eyes, regular clothing, tools, drains, electrical equipment, or incompatible materials.
• Fumes, splashing, pressure, heat, bubbling, swelling, or hissing occurs.
• The safety data sheet, first aid steps, or emergency response plan is not available.

Final Reminder

Acids and bases can injure workers fast and react badly when mixed wrong. Read the label, wear the right PPE, control splashes, keep chemicals separated, and flush immediately if exposure happens.