| abstract |
The present invention discloses a fire door using a NF felt layer, the fire door comprising: an external iron plate layer; NF felt layer formed adjacent to the iron plate layer, formed in the inner direction; a glass mat layer formed adjacent to the NF felt layer and formed in an inward direction; an aluminum layer formed adjacent to the glass mat and formed in an inward direction; It is formed adjacent to the aluminum layer, and includes a heat insulating material layer formed in the inner direction. In an embodiment of the present invention, in the event of a fire, the metal layer and the NF felt layer expand in the outward direction, so that the flame retardant performance, the flame retardant performance and the heat shielding performance are improved compared to the existing ones. |