Robnor px439xs potting compound twin pack robnor px439xs bk 1000 p robnor px439xs potting compound is a rigid thermally conductive epoxy resin with excellent heat resistance and dimensional stability p p the resin is supplied in a divided twinpack pre weighed resin and hardener in the correct proportions contained in a tough flexible film separated by a removable clip and rail once the clip and rail is removed the resin and hardener can be thoroughly mixed within the bag and is imm