UL Splits FR-4 Standards Into Two Categories

For the past year, it seemed likely that designers and users of new FR-4 laminate and prepreg materials would have to run new materials through complete testing to be certified by Underwriters Laboratories Inc. (UL). That 2012 requirement disappeared when UL’s Standards Technical Panel (STP) split what was a single category of FR-4 into two categories in the UL 746E Polymeric Materials Safety Standard.

- Terry Costlow & Tom Newton, IPC on PCB007