What is the best practice for disposing of oily rags?

Storing oily rags in a metal container with a lid is the best practice because it effectively minimizes the risk of fire hazards associated with spontaneous combustion. Oily rags, especially those infused with lubricants, oils, or solvents, can generate heat as they break down over time. When these rags are improperly stored, such as in cardboard boxes or left exposed, they can ignite, leading to fires.

A metal container with a lid provides a safe, airtight environment that limits oxygen exposure. This containment reduces the likelihood of combustion, allowing for safer disposal of flammable materials. Additionally, it is a common safety practice in various industries to utilize closed metal containers for the storage of such hazardous materials until they can be disposed of in compliance with local regulations.

The other disposal methods present significant safety concerns that could lead to fire incidents, which is why they are not recommended. Implementing proper storage practices ensures a safer working environment and helps prevent accidental fires.