The master lock small key locking fire chest is versatile and compact it protects your familys most important paper documents digital media and valuables from fire damage ul classified for fire endurance 12 hour at 843c to ensure protection of documents records and valuables in the event of a fire ul classified explosion hazard test subjected to a flash fire in a 1093c furnace for 20 minutes the unit will not explode or rupture etl verified for 12 hour fire protection of digital media up to 84