Ratings Explained

Safe Ratings Fire & Burgular

  

Fire Ratings

  • 1/2 Hour - U.L.™ class 350 Rate Safe:
    This safe has been tested by the Underwriters Laboratory™.  The unit is heated for one-half hour to reach an exterior temperature of 1550 degrees. Because paper will begin to char at approximately 410 degrees, the unit being tested must maintain an interior temperature of less than 350 degrees during heat-up and cool-down testing in order to earn its rating. At U.L.™ after the safe has hit the test time, the safe is removed from the oven and hoisted 30 feet (equal to 3 flights of a building) and dropped onto concrete rubble. It is allowed to cool and then picked up and placed back into a 2000 degree F preheated oven. This is called the explosive test. It is done to see if the door will blow off. It remains in the oven and the contents of the safe must remain unharmed.
  • 1 Hour - U.L™ class 350 Rate Safe:
    To earn this rating, the safe is heated for one hour to reach an exterior temperature of 1550 degrees, then put through the cool down test. Like the 1/2 hour test, the safe must maintain an interior temperature of less than 350 degrees throughout the test. At U.L.™ after the safe has hit the test time, the safe is removed from the oven and hoisted 30 feet (equal to 3 flights of a building) and dropped onto concrete rubble. It is allowed to cool and then picked up and placed back into a 2000 degree F preheated oven. This is called the explosive test. It is done to see if the door will blow off. It remains in the oven and the contents of the safe must remain unharmed.
  • 2 Hour - U.L™ class 350 Rate Safe:
    The safe is heated for two hours to reach an exterior temperature of 1550 degrees, then put through the cool down test. During the complete process, the interior of the safe cannot go above 350 degrees. At U.L.™ after the safe has hit the test time, the safe is removed from the oven and hoisted 30 feet (equal to 3 flights of a building) and dropped onto concrete rubble. It is allowed to cool and then picked up and placed back into a 2000 degree F preheated oven. This is called the explosive test. It is done to see if the door will blow off. It remains in the oven and the contents of the safe must remain unharmed.

Understanding safe ratings

Underwriters Laboratories

 

UL RATINGS

UL stands for Underwriters Laboratories, an independent organization dedicated to educating businesses and the public about safety and performance of products in a wide spectrum of industries. UL has been testing and rating products for more than 100 years, and evaluates nearly 20,000 products annually. The UL rating is an indicator of product quality and certification of safety.

TL Rating

TL rated safes are combination lock safes that offer protection against combinations of mechanical, electrical, and cutting tools. Safes with a TL rating will resist abuse for a varying amount of time, depending on which classification tier they fall under, from picking tools to hand tools, mechanical or electrical tools, grinding points, carbide drills, pressure-applying devices, cutting wheels, power saws and impact tools. Some levels of TR-rated safes can also withstand welding and cutting torch abuse at certain levels.

B-Rating

A B-rated safe’s walls are less than 1/2" thick, and its doors are less than 1" inch thick. A B-rated safe earns its rating with the presence of a locking device. Typically, lock work and re-locks are examined when choosing a B-rated safe.

C-Rating

C Rate safes have steel walls that are at least 1/2” thick and doors that are at least 1” thick, as well as a lock.

Fire Rating

Fire ratings are evaluated by testing to see if safes withstand varying furnace heat for specific amounts of time. For example, the UL Class 350 1-hour fire rating means that the internal temperature of the safe will not exceed 350°F for at least 1 hour when exposed to external temperatures over 1700°F. A safe may have a 1-, 2-, or 3-hour time classification. Additionally, safes will be heated and then dropped from heights reaching 30 feet to test against explosions.