Gasket for Door Frame and Door Frame of Fire-proof Door having such Gasket

摘要

The present invention has a configuration in which a thermally expandable foam that expands when a temperature exceeds a critical temperature is provided between a pair of gasket bodies, and the temperature rises due to a fire or the like in a state where it is installed in the door frame, A gasket for a door frame which expands the temperature expansible foam to fill the gap between the door and the door frame so as to block the passage of the flame or the smoke even if a gap is generated between the door and the door frame, The present invention relates to a door frame which is provided with a gasket and can be very usefully used for a fire door.