Oily rag storage should be in a

• A. Plastic container
• B. Cardboard box
• C. Wooden crate
• D. Metal container

Answer: (D)

Oily rags pose a fire hazard because the oils can oxidize and generate heat in a confined pile. Storing them in a metal container is the safest choice because metal is noncombustible and a tightly closed lid helps limit air exposure, slowing any potential ignition and containing heat. Plastic containers can melt or burn if exposed to hot, oil-soaked rags. Cardboard and wooden crates are combustible and can easily fuel a fire, making them poor storage options. So using a metal container with a tight-fitting lid minimizes fire risk and is the best practice.