Forced entry attacks relate to burglaries and civil disturbance threats. HP White Specification 02: TP-05000.02, dated September 1993, indicates five levels of force entry protection against various types of attacks. These include blunt impact (hammers), sharp impact (chisels), thermal stress (torches) and chemical deterioration (solvents). The levels of protection relate to either the number of impacts a forced entry protected assembly will withstand or the time, in minutes, required to bypass a forced entry protected assembly with the use of torches or chemical agents. Level I offers the least amount of resistance protection; Level V offers the most amount of resistance protection.
Ballistic attacks relate to gunshot bullet threats. UL Laboratories: UL 752 Criteria, Table 3.1, dated Jan. 27, 1995, indicates eight levels of ballistic resistant protection. Level 1 ballistic protected assemblies is the least resistant, and will only withstand a single shot from small handguns. Level 3 ballistic protected assemblies will withstand multiple (four to five) shots from average handguns. Level 4 ballistic protected assemblies will withstand multiple (four to five) shots from high-powered hunting and sporting rifles, such as a .30-06, with a muzzle energy of 971 to 1,175 foot-pounds. Level 8 ballistic protected assemblies are the most resistant, and will withstand multiple shots from high-powered military assault rifles and machine guns. Ballistic attacks may also include punching type threats from shrapnel or high-powered projected metal fragments that may result from an explosion.