Corrosive liquids, characterized by their ability to deteriorate materials and pose health risks, require meticulous handling and storage in laboratory settings. Implementing effective storage solutions is essential to prevent damage and ensure safety.

Understanding Corrosive Liquids

Corrosive liquids are substances with a pH less than 2 or greater than 12.5, capable of corroding steel at a rate exceeding 6.35 mm per year at 55°C. In humid environments, their fumes can condense on metal surfaces, leaving behind corrosive residues upon evaporation.

Best Practices for Storing Corrosive Liquids

1. Maintain Optimal Storage Conditions

   1. Low Humidity and Proper Ventilation: Store corrosive substances in areas with controlled humidity and adequate ventilation to minimize fume accumulation.

   2. Sealed Containers: Ensure all corrosive chemicals are kept in tightly sealed containers to prevent leaks and fume release.

2. Regular Inspection and Maintenance

   1. Container Checks: Routinely inspect storage containers for signs of damage or corrosion, replacing them as necessary to prevent leaks.

   2. Spill Management: Utilize chemical-resistant trays within storage cabinets to catch potential spills, and clean any residues promptly to prevent surface damage.

3. Appropriate Storage Cabinets

   1. Cabinet Ventilation: Corrosive storage cabinets should be vented only when required by local authorities. If venting is necessary, use PVC materials and consider connecting to existing exhaust systems, such as fume hoods.

   2. Quantity Control: Limit the on-site storage of corrosive liquids to the minimum necessary amounts. For small quantities, countertop cabinets designed for corrosive materials are suitable.

Types of Corrosive Storage Cabinets

Selecting the appropriate storage cabinet depends on the specific needs and hazards associated with the corrosive substances in use. Common types include:

• Double-Wall Steel Cabinets: Featuring a 1.5-inch air space, dual vents, grounding connections, adjustable shelves, self-latching lockable doors, and leveling feet, these cabinets are suitable for corrosives that are also flammable.
• Combination Cabinets: Designed to store both flammable and corrosive materials, these double-wall steel cabinets offer versatility in mixed-use laboratories.
• Lined Double-Wall Steel Cabinets: These cabinets provide additional protection with interior linings resistant to corrosive damage, enhancing durability.
• Molded Polyethylene Cabinets: Ideal when fire protection is not a primary concern, these cabinets are impervious to harsh acids and corrosive chemicals. They often include removable polyethylene spill trays and vent openings compatible with vapor removal systems.
• Wood Cabinets with Laminate Finish: Offering chemical durability, these cabinets feature long-lasting wood core construction with stainless steel hardware to resist corrosion. However, they are not suitable for flammable liquid storage.

Additional Safety Recommendations

Chemical Segregation: Store incompatible chemicals separately to prevent hazardous reactions.

Labeling: Clearly label all storage areas and containers with the appropriate hazard symbols and chemical information.

Training: Ensure all laboratory personnel are trained in the proper handling, storage, and emergency procedures related to corrosive liquids.

By adhering to these guidelines and selecting appropriate storage solutions, laboratories can effectively manage the risks associated with corrosive liquids, ensuring a safe and compliant working environment.