In October 2023, Underwriters Laboratory (UL) released the 12th edition of UL 752 a significant update.
Edition 11 used the familiar ‘Level 1 through Level 10’ Levels in Edition 11 suggested a simple escalation of protection—higher levels meant stronger materials. In practice, however, the hierarchy masked important differences which meant that higher numeric levels did not necessarily provide protection for the lower numeric numbers.
Edition 12 replaces the old levels with clear, threat‑specific designations and strengthens the rigor and consistency of ballistic testing.
As organizations reassess facility vulnerability and protective design strategies, this new edition provides a more reliable foundation for specifying ballistic glazing, wall systems, doors, and manufactured assemblies.