To reduce fire risk, oily shop rags should be stored in a metal container with a closed lid to prevent what?

• A. To prevent spontaneous combustion fire
• B. To prevent water damage
• C. To prevent rust
• D. To prevent theft

Answer: (A)

Oily rags can undergo spontaneous oxidation, generating heat inside a pile. If that heat isn’t dissipated, it can rise to the point of ignition and start a fire. A metal, noncombustible container with a tight lid limits oxygen exposure and contains heat, slowing the oxidation process and reducing the chance that the rags will ignite on their own. This is why it’s the best way to reduce fire risk.