People often use fireproof safes in homes to keep important documents such as birth certificates, vehicle titles, and bill receipts safe from a fire. To make safes fireproof, there are linings placed around the edge of the door where the door makes contact. Linings are called boiler gaskets and installed by applying a UL tested intumescent fire-retardant caulking ensures a good seal to prevent fire, smoke and moisture from entering the safe. To ensure the safes are fireproof, the manufacturer places them in an oven, the ovens are set to 1200 degrees Fahrenheit and monitor the internal temperature. When the inside of the safe reaches 350 degrees Fahrenheit, the test stops and the safes evaluate how long it takes for the inside to reach 350 degrees Fahrenheit. After the safes are tested, the company will classify them as “class 350-1,” the “350” based on how hot the inside became during testing. “1” shows how long it took to get there; in this case it took an hour. If they took two hours, a “2” would replace a “1” in the class rating. This also comes in many sizes, from a tissue box to a large pistol