UL fire resistive container classifications

   class 125
  n.
   a group of UL classifications for containers that maintain inside temperatures less than 125 degrees Fahrenheit when exposed to a fire of specific temperature and duration. The times and fire temperatures are:
   • ½ hour 1700 degrees F.
   • 1 hour 1700 degrees F.
   • 2 hour 1850 degrees F.
   • 3 hour 1925 degrees F.
   • 4 hour 2000 degrees F.
   class 150
  n.
   a group of UL classifications for containers that maintain inside temperatures less than 150 degrees Fahrenheit when exposed to a fire of specific temperature and duration. The times and fire temperatures are:
   • ½ hour 1700 degrees F.
   • 1 hour 1700 degrees F.
   • 2 hour 1850 degrees F.
   • 3 hour 1925 degrees F.
   • 4 hour 2000 degrees F.
   class 350
  n.
   a group of UL classifications for containers that maintain inside temperatures less than 350 degrees Fahrenheit when exposed to a fire of specific temperature and duration. The times and fire temperatures are:
   • ½ hour 1700 degrees F.
   • 1 hour 1700 degrees F.
   • 2 hour 1850 degrees F.
   • 3 hour 1925 degrees F.
   • 4 hour 2000 degrees F.

Locksmith dictionary . 2014.

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