What is the primary reason for storing oily rags and wipes in a fireproof can with a lid?

Storing oily rags and wipes in a fireproof can with a lid is primarily intended to prevent fires through spontaneous combustion. Oily rags can undergo chemical reactions when they are exposed to air, leading to heat generation. If these rags are left in a pile or inadequately ventilated, the heat can build up to a point where it ignites the materials. By using a fireproof can with a lid, the risk of ignition is significantly reduced as the container helps to contain any potential fires and limits the availability of oxygen that might contribute to combustion. This safety practice is crucial in environments where flammable materials are present, ensuring a safer workspace by managing the risk of fire.