Metacaulk BOX GUARD Metacaulk BOX GUARD is a one component fire rated pad for use in electrical box-es. It is inserted on the inside back wall of an electrical box, and is a highly intumescent firestop material. Technical Data Sheet : English Category: Metacaulk Related products MetacaulkMetacaulk COVER GUARD Read more MetacaulkMetacaulk Putty Read more MetacaulkMetacaulk Wrap Strip Read more