What do you know about the fire door materials?

There are many types of fire doors, usually we distinguish them according to materials: wooden fire doors, steel fire doors, steel wood fire doors, other fire doors, etc .;

Wooden fire door: Use incombustible wood or incombustible wood products as door frames, skeletons, and door leaf panels. And the filled material must be fire-proof and heat-insulating material which is non-toxic and harmless to human body. And equipped with hardware accessories with fire resistance;

Steel fire door: The door frames, skeletons, and door leaf panels are made of steel materials. And the filled material must be fire-proof and heat-insulating material which is non-toxic and harmless to human body. And equipped with hardware accessories with fire resistance;

Steel Wooden fire door: The door frames are made of steel materials. The skeletons and door leaf panels are made of incombustible wood materials or incombustible wood products. And the filled material must be fire-proof and heat-insulating material which is non-toxic and harmless to human body. And equipped with hardware accessories with fire resistance.